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NJ Pesticide Applicator study materials
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NJ Pesticide Applicator practice questions

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Question 1Pest Management and Pesticide Use (core)

Which statement best describes the difference between a pesticide's active ingredient and its inert ingredients?

  1. The active ingredient improves spray coverage, while inert ingredients kill the target pest.
  2. The active ingredient is always the largest component by weight in a formulated product.
  3. The active ingredient is listed only on the label, while inert ingredients determine the signal word.
  4. The active ingredient controls the target pest, while inert ingredients serve as carriers, solvents, or adjuvants. Correct answer.

Explanation

The active ingredient is the component responsible for the pesticidal action against the target pest. Inert ingredients do not control pests themselves; they function as carriers, solvents, emulsifiers, or adjuvants that make the formulation usable.

Question 2Pest Management and Pesticide Use (core)

A pesticide applicator reads a label that states the product is a 'restricted use pesticide.' What does this designation require?

  1. The product may be applied only by government employees.
  2. The product may only be sold to certified applicators or persons under their direct supervision. Correct answer.
  3. The product requires a written prescription from a licensed physician.
  4. The product can be used only in agricultural settings.

Explanation

Restricted use pesticides may be purchased and applied only by certified applicators or by persons working under their direct supervision. The restriction is tied to applicator certification, not to employment type or site category.

Question 3Pest Management and Pesticide Use (core)

When a pesticide label gives a range of application rates, what factor most commonly determines where in that range an applicator should operate?

  1. The pest pressure and the size or density of the target pest population Correct answer.
  2. The day of the week the application is made
  3. The color of the spray tank
  4. The applicator's personal preference for stronger mixes

Explanation

Labels provide a rate range so applicators can match the dose to the severity of the pest problem and the density of the target. Higher rates within the range are used for heavier pressure, while lower rates suffice for light infestations.

Question 4Pest Management and Pesticide Use (core)

What is the primary purpose of the signal word on a pesticide label?

  1. To specify the required reentry interval
  2. To show the chemical class of the active ingredient
  3. To identify the manufacturer's registration number
  4. To indicate the relative acute toxicity hazard of the formulated product Correct answer.

Explanation

The signal word (Danger, Warning, or Caution) communicates the relative acute toxicity of the formulated product to humans. It is a hazard indicator, not a registration or classification identifier.

Question 5Pest Management and Pesticide Use (core)

Which practice best protects groundwater when applying a mobile pesticide to a sandy soil?

  1. Applying just before a forecasted heavy rain to incorporate the product
  2. Doubling the rate to shorten the residual period
  3. Applying to saturated soils so the product moves uniformly
  4. Applying at the labeled rate and avoiding application before heavy rainfall Correct answer.

Explanation

Sandy soils with low organic matter allow pesticides to leach readily, and heavy rain soon after application increases the chance of movement into groundwater. Applying at the labeled rate and avoiding imminent heavy rain reduces leaching risk.

Question 6Pest Management and Pesticide Use (core)

An applicator is calibrating a boom sprayer and finds the output is higher than desired. Which change will reduce the spray volume delivered per acre?

  1. Increasing nozzle pressure
  2. Using nozzles with a larger orifice
  3. Increasing sprayer speed while holding nozzle pressure constant Correct answer.
  4. Decreasing sprayer speed

Explanation

Spray volume per acre is inversely related to ground speed when pressure and nozzle size are fixed. Increasing speed spreads the same output over more area, lowering the volume applied per acre.

Question 7Pest Management and Pesticide Use (core)

Which of the following is the best example of a cultural control tactic in an integrated pest management program?

  1. Using a pheromone trap to monitor moth emergence
  2. Applying a broad-spectrum insecticide on a calendar schedule
  3. Rotating crops to interrupt the life cycle of a soilborne pathogen Correct answer.
  4. Releasing a predatory mite to control spider mites

Explanation

Cultural controls manipulate the growing environment or cropping practices to suppress pests, and crop rotation is a classic example. The other choices are chemical, biological, and monitoring tactics.

Question 8Pest Management and Pesticide Use (core)

What is the key principle of integrated pest management regarding pesticide use?

  1. Pesticides are used only when monitoring shows the pest population has reached an action threshold. Correct answer.
  2. Pesticides are applied on a fixed schedule to prevent any pest from appearing.
  3. Pesticides are chosen solely on the basis of lowest cost per gallon.
  4. Pesticides are avoided entirely regardless of economic loss.

Explanation

IPM relies on monitoring and thresholds so that pesticides are applied only when the pest population justifies treatment. This reduces unnecessary applications while still protecting the crop.

Question 9Pest Management and Pesticide Use (core)

Repeated use of a single-site insecticide against the same population is most likely to lead to which outcome?

  1. Selection for individuals with a resistance mechanism, reducing product efficacy Correct answer.
  2. Reduced need for monitoring in future seasons
  3. Increased susceptibility of the pest to the product
  4. Permanent elimination of the pest from the site

Explanation

Repeated exposure to one mode of action selects for resistant individuals that survive and reproduce. Rotating modes of action and integrating other tactics slows resistance development.

Question 10Pest Management and Pesticide Use (core)

Why does the label often instruct applicators to avoid spraying during temperature inversions?

  1. Spray droplets can remain suspended in a stable air layer and drift far from the target area. Correct answer.
  2. Pesticides break down instantly in inverted air.
  3. Inversions increase nozzle wear and change the spray pattern.
  4. Inversions cause the spray solution to freeze in the tank.

Explanation

A temperature inversion creates a stable layer of air that traps fine droplets and allows them to travel long distances off target. Applications should be postponed until the inversion breaks.

Question 11Pest Management and Pesticide Use (core)

Which factor most directly increases the risk of pesticide drift from a ground application?

  1. Large droplets combined with low wind speed
  2. Applying when relative humidity is high and winds are calm
  3. Small droplets combined with wind moving toward a sensitive site Correct answer.
  4. Using a coarse nozzle and low pressure

Explanation

Drift risk rises with the proportion of fine droplets and with wind carrying them toward sensitive areas. Coarse droplets and calm conditions reduce off-target movement.

Question 12Pest Management and Pesticide Use (core)

What does the reentry interval (REI) on a pesticide label specify?

  1. The time required for the product to be absorbed by the plant
  2. The minimum time that must pass before workers may enter the treated area without protective equipment Correct answer.
  3. The time a pesticide remains effective against the target pest
  4. The maximum number of applications allowed per season

Explanation

The REI protects workers by specifying how long entry into a treated area must be delayed unless the required protective equipment is worn. It is a worker safety interval, not an efficacy or rate limit.

Question 13Pest Management and Pesticide Use (core)

An applicator must dispose of a small amount of leftover pesticide mixture. Which approach is most consistent with label directions and environmental protection?

  1. Store it indefinitely in an unlabeled bucket.
  2. Dump it along a fence row away from crops.
  3. Apply the rinsate to a labeled site at the labeled rate, or manage it as directed by the label and state rules. Correct answer.
  4. Pour it down a floor drain connected to a septic system.

Explanation

Leftover mix and rinsate should be handled according to label directions and state regulations, often by applying to a labeled site at the labeled rate or using an approved disposal method. Improper dumping can contaminate water and violate the law.

Question 14Pest Management and Pesticide Use (core)

Which statement correctly describes the relationship between pest identification and successful pest management?

  1. Identification is unnecessary if a broad-spectrum product is used.
  2. Any insect found on the crop should be treated immediately.
  3. Identification matters only for regulatory reporting.
  4. Correct identification allows selection of a tactic that targets the specific pest's biology. Correct answer.

Explanation

Effective management depends on knowing the pest so a tactic can be matched to its life cycle and vulnerabilities. Misidentification can lead to ineffective or unnecessary treatments.

Question 15Pest Management and Pesticide Use (core)

What is an action threshold in pest management?

  1. The amount of pesticide that can be stored in a mixing area
  2. The maximum legal application rate printed on the label
  3. The time of day when spraying is prohibited
  4. The pest population level at which control measures should be initiated to prevent unacceptable damage Correct answer.

Explanation

An action threshold is the pest density at which treatment is justified to prevent economic or aesthetic damage. It is a decision tool derived from monitoring, not a regulatory limit.

Question 16Pest Management and Pesticide Use (core)

Which of the following best describes biological control?

  1. Applying a synthetic insecticide to a field
  2. Using a trap crop to lure pests away from the main crop
  3. Altering planting dates to avoid a pest
  4. Using natural enemies such as predators, parasitoids, or pathogens to suppress pest populations Correct answer.

Explanation

Biological control uses living natural enemies to reduce pest populations. The other choices are chemical, cultural, and cultural/physical tactics.

Question 17Pest Management and Pesticide Use (core)

A grower notices that a herbicide that once controlled a weed species well now provides poor control after several seasons of use. What is the most likely explanation?

  1. The weed has become a different species overnight.
  2. The herbicide has lost potency because of normal shelf aging in the field.
  3. The sprayer nozzle has become permanently clogged.
  4. The weed population has developed resistance to that herbicide's mode of action. Correct answer.

Explanation

Poor control after repeated use of the same mode of action is a hallmark of evolved herbicide resistance. Confirming resistance and rotating modes of action are key responses.

Question 18Pest Management and Pesticide Use (core)

Which practice helps prevent pesticide contamination of surface water from a mixing and loading site?

  1. Rinsing containers into a ditch
  2. Mixing on bare soil near a stream
  3. Leaving spilled concentrate to evaporate
  4. Mixing on an impermeable pad with containment and keeping the site away from wells and surface water Correct answer.

Explanation

Mixing and loading areas should be designed to contain spills and rinsate and located away from water sources. This prevents concentrate from reaching surface or groundwater.

Question 19Pest Management and Pesticide Use (core)

Why should an applicator avoid tank-mixing products whose labels do not permit mixing?

  1. The combination may cause physical incompatibility or increase hazards not covered by the label. Correct answer.
  2. Tank-mixing always doubles the legal application rate.
  3. Mixing products always destroys the active ingredients.
  4. The label requires a new registration for every mix.

Explanation

Labels specify whether mixing is allowed because combinations can cause incompatibility, phytotoxicity, or added hazards. Following label directions keeps the application legal and safe.

Question 20Pest Management and Pesticide Use (core)

Which of the following is the best description of pesticide 'formulation'?

  1. The agency that registers the product
  2. The rate at which the product is applied
  3. The physical form in which the active ingredient is prepared and sold, such as an emulsifiable concentrate or granular Correct answer.
  4. The chemical name of the active ingredient

Explanation

Formulation refers to how the active ingredient is combined with carriers and other ingredients and sold, such as EC, WP, or granular. It affects handling, mixing, and application.

Question 21Pest Management and Pesticide Use (core)

An applicator observes a honey bee colony near the target site and expects bloom during the application window. Which action best follows pollinator protection principles?

  1. Delay or avoid the application during bloom and follow label pollinator precautions. Correct answer.
  2. Apply directly to the blossoms to reduce bee exposure later.
  3. Increase the rate to shorten the residual period.
  4. Apply at midday when bees are most active.

Explanation

Pollinator protection relies on avoiding applications to blooming crops and following label restrictions, since foraging bees are exposed to residues on flowers. Timing and label compliance reduce risk.

Question 22Pest Management and Pesticide Use (core)

What is the primary reason for triple-rinsing an empty pesticide container before disposal?

  1. To prepare the container for reuse as a drinking water vessel
  2. To remove residual pesticide so the container can be handled and recycled safely Correct answer.
  3. To neutralize the active ingredient chemically
  4. To increase the volume of waste liquid

Explanation

Triple rinsing removes most residual product so the container can be disposed of or recycled with minimal hazard. The rinsate is added to the spray tank and applied to a labeled site.

Question 23Pest Management and Pesticide Use (core)

A label states a restricted-entry interval of 12 hours. A worker must enter the treated area 6 hours after application to repair irrigation. What is the most appropriate action?

  1. Enter without protection because irrigation repair is not pesticide work.
  2. Wait until exactly 12 hours have passed before any entry is allowed under any circumstance.
  3. Enter immediately with no protective equipment because the task is short.
  4. Follow the label's early-entry provisions, which may require specific protective equipment and conditions. Correct answer.

Explanation

Some labels allow early entry under specific conditions, typically with required protective equipment and limits on task duration. Without meeting those provisions, entry before the REI ends is not permitted.

Question 24Pest Management and Pesticide Use (core)

An applicator is choosing between two products with the same active ingredient but different formulations. Which consideration is most relevant to selecting the formulation for a waxy-leafed crop?

  1. The color of the product packaging
  2. The price per container regardless of coverage
  3. The registration number assigned by the agency
  4. Whether the formulation includes an adjuvant or surfactant that improves coverage on the waxy surface Correct answer.

Explanation

Waxy leaf surfaces resist wetting, so a formulation or added adjuvant that improves spread and adhesion can increase effectiveness. Formulation choice should match the target surface and application method.

Question 25Pest Management and Pesticide Use (core)

Which situation best illustrates the concept of pesticide 'carryover' injury?

  1. A container leaks during transport to a disposal site
  2. A worker develops a rash after mixing concentrate
  3. A spray droplet drifts onto a neighboring field during application
  4. A soil-applied herbicide persists and injures a sensitive crop planted the following season Correct answer.

Explanation

Carryover occurs when a pesticide residue persists in soil and affects a subsequently planted sensitive crop. It differs from drift, which is off-target movement during application.

Question 26Pest Management and Pesticide Use (core)

Which term describes the ability of a pesticide to cause injury to a nontarget organism such as a bird or fish?

  1. Toxicity Correct answer.
  2. Persistence
  3. Resistance
  4. Selectivity

Explanation

Toxicity refers to the inherent capacity of a pesticide to harm an organism, including nontarget wildlife. Selectivity describes how narrowly a product affects only target pests, while persistence describes how long a residue remains.

Question 27Pest Management and Pesticide Use (core)

A pesticide label signal word of DANGER with the skull-and-crossbones symbol indicates which hazard category?

  1. Highly toxic by any route of exposure Correct answer.
  2. Moderate hazard limited to eye irritation
  3. Caution-level hazard requiring no protective equipment
  4. Slightly toxic by oral exposure only

Explanation

The skull-and-crossbones with DANGER marks products in the highest toxicity category, which are highly toxic by oral, dermal, or inhalation routes. This signal word triggers the strictest label precautions.

Question 28Pest Management and Pesticide Use (core)

Which route of exposure accounts for the largest share of occupational pesticide poisoning among agricultural workers?

  1. Absorption through the eyes
  2. Ingestion of contaminated food
  3. Dermal absorption through skin Correct answer.
  4. Inhalation of vapors

Explanation

Skin contact is the most common route of occupational pesticide exposure because deposits land on hands, arms, and clothing during mixing and application. Dermal absorption can be substantial for many active ingredients.

Question 29Pest Management and Pesticide Use (core)

What does the term LD50 represent in pesticide toxicology?

  1. The dose that kills half of a test population Correct answer.
  2. The legal limit for residues in drinking water
  3. The longest duration a residue remains active
  4. The concentration that repels half of a test population

Explanation

LD50 is the lethal dose that kills 50 percent of the test animals under stated conditions, and it is used to compare acute toxicity. A lower LD50 indicates a more acutely toxic product.

Question 30Pest Management and Pesticide Use (core)

Which statement best distinguishes a preventive pest management approach from a reactive one?

  1. Preventive programs reduce conditions that let pests establish Correct answer.
  2. Preventive programs apply the maximum labeled rate routinely
  3. Preventive programs ignore monitoring until harvest
  4. Preventive programs rely on curative sprays after damage appears

Explanation

Prevention focuses on eliminating the resources, entry points, and conditions pests need before populations build. Reactive management responds with treatments only after pests or damage are detected.

Question 31Pest Management and Pesticide Use (core)

Which of the following is an example of a mechanical control tactic?

  1. Planting a resistant crop variety
  2. Installing physical barriers such as screens Correct answer.
  3. Releasing a predatory mite
  4. Applying a preemergence herbicide

Explanation

Mechanical control uses physical means, such as screens, traps, or cultivation, to exclude or remove pests. Screens directly block pest access without chemical or biological action.

Question 32Pest Management and Pesticide Use (core)

What is the primary purpose of reading the label's environmental hazard section before an outdoor application?

  1. To learn the product's shelf life
  2. To determine the required PPE for mixing only
  3. To identify restrictions protecting wildlife, water, and pollinators Correct answer.
  4. To calculate the price per treated acre

Explanation

Environmental hazard statements warn about risks to nontarget organisms and sensitive areas and may impose buffer or timing restrictions. Applicators must follow these directions to avoid off-site harm.

Question 33Pest Management and Pesticide Use (core)

Which practice is most appropriate for storing pesticides safely between applications?

  1. Leaving them in the application vehicle overnight
  2. Placing them near animal feed for convenience
  3. Keeping them in unmarked beverage containers
  4. Storing them in a locked, ventilated area away from food Correct answer.

Explanation

Pesticides should be kept in a secure, ventilated storage area separate from food, feed, and living spaces. Locking the area prevents unauthorized access and accidental poisoning.

Question 34Pest Management and Pesticide Use (core)

An applicator wants to reduce the chance that a soil-applied herbicide injures a sensitive rotational crop the following season. Which factor should be examined first?

  1. The sprayer nozzle color
  2. The product's soil persistence and rotational restriction statements Correct answer.
  3. The color of the label band
  4. The size of the mixing tank

Explanation

Herbicide carryover risk depends on how long the product persists in soil and on label rotational restrictions. The label states the required interval before sensitive crops may be planted.

Question 35Pest Management and Pesticide Use (core)

A pest population is described as having developed resistance to an insecticide. Which observation supports this conclusion?

  1. The product no longer mixes easily in the tank
  2. Survivors reproduce and their offspring also survive the labeled rate Correct answer.
  3. The pest moves more slowly after treatment
  4. The product's odor has changed since purchase

Explanation

Resistance is an inherited trait, so survivors of a treatment pass the ability to withstand the product to their offspring. Repeated reduced control at the labeled rate confirms the pattern.

Question 36Pest Management and Pesticide Use (core)

How does rotating among pesticide mode-of-action groups help manage resistance?

  1. It increases the application rate needed for control
  2. It guarantees that no resistance will ever develop
  3. It eliminates the need to monitor pest populations
  4. It reduces the selection pressure on any single resistance mechanism Correct answer.

Explanation

Pests that survive one mode of action may still be controlled by a product that attacks a different target site. Alternating groups reduces the chance that a single resistance mechanism dominates the population.

Question 37Pest Management and Pesticide Use (core)

An applicator notices that a product's label lists a maximum number of applications per season. Why must this limit be observed?

  1. To keep the sprayer within its warranty
  2. To reduce the number of nozzles needed
  3. To limit residue buildup and slow resistance development Correct answer.
  4. To shorten the product's storage life

Explanation

Seasonal application limits cap total active ingredient applied, which limits residues in the crop and environment and reduces selection pressure for resistance. Exceeding the limit is a label violation.

Question 38Pest Management and Pesticide Use (core)

What is the main reason to keep a written record of each pesticide application?

  1. To provide traceability for regulatory compliance and pest management decisions Correct answer.
  2. To justify buying a larger sprayer
  3. To replace the need for a current label
  4. To avoid calibrating equipment

Explanation

Application records document what was applied, where, when, and at what rate, supporting legal compliance and informed future pest management. They also help trace residues or incidents.

Question 39Pest Management and Pesticide Use (core)

An applicator plans to treat a field adjacent to a sensitive aquatic habitat. Which label element most directly governs whether the application may proceed?

  1. The first aid statement
  2. The storage and disposal section
  3. The environmental hazard restrictions and buffer requirements Correct answer.
  4. The physical or chemical hazards section

Explanation

Environmental hazard statements may prohibit or restrict use near water and may specify buffer distances. These restrictions determine whether and how the application can legally be made near the habitat.

Question 40Pest Management and Pesticide Use (core)

Which approach best reflects the IPM principle of using multiple tactics together?

  1. Combining resistant varieties, sanitation, and targeted treatments Correct answer.
  2. Relying on one broad-spectrum insecticide all season
  3. Increasing rates until pests disappear
  4. Spraying on a fixed calendar regardless of pest presence

Explanation

Integrated pest management combines compatible tactics such as host resistance, sanitation, and judicious chemical use based on monitoring. Layering tactics reduces reliance on any single method.

Question 41Pest Management and Pesticide Use (core)

A greenhouse grower finds a few aphids on sticky cards early in the season. Which response is most consistent with IPM decision-making?

  1. Stop monitoring until visible damage appears
  2. Monitor population growth and treat only if the action threshold is reached Correct answer.
  3. Apply the maximum labeled rate of a broad-spectrum insecticide immediately
  4. Remove all plants and abandon the crop

Explanation

IPM uses monitoring data compared against an action threshold to decide whether treatment is warranted. A few aphids on cards may not justify a pesticide application.

Question 42Pest Management and Pesticide Use (core)

Which characteristic most distinguishes a selective herbicide from a nonselective one?

  1. Selective herbicides require no calibration
  2. Selective herbicides control only certain plant species at labeled rates Correct answer.
  3. Selective herbicides kill all plants they contact
  4. Selective herbicides are always more persistent in soil

Explanation

Selective herbicides injure only certain plants, such as grasses or broadleaves, at labeled rates, leaving the crop unharmed. Nonselective products injure most vegetation they contact.

Question 43Pest Management and Pesticide Use (core)

A crop has a dense canopy and the applicator needs thorough coverage of the lower leaf surfaces. Which adjustment is most appropriate?

  1. Use a directed spray with adequate carrier volume and appropriate nozzles Correct answer.
  2. Increase travel speed to shorten the application
  3. Reduce spray pressure until the pattern breaks up
  4. Increase droplet size and reduce carrier volume

Explanation

Penetrating a dense canopy requires sufficient carrier volume and nozzles oriented to reach the target zone. Directed sprays help place the material where it is needed.

Question 44Pest Management and Pesticide Use (core)

Why is it important to identify the target pest to species or at least to the correct group before selecting a pesticide?

  1. All pesticides control all pests equally
  2. Labels are often specific to certain pests or pest groups Correct answer.
  3. Species identity affects only the product's shelf life
  4. Identification determines the sprayer color

Explanation

Many labels list the specific pests the product may be used against, so correct identification determines whether a product is legal and effective. Misidentification can lead to ineffective or unlawful applications.

Question 45Pest Management and Pesticide Use (core)

An applicator must measure a small volume of concentrated liquid product while mixing. Which practice best reduces exposure risk?

  1. Rinse hands with the concentrate after measuring
  2. Estimate the volume by sight to save time
  3. Measure by pouring over an open container at eye level
  4. Use a dedicated measuring device and stand upwind with PPE in place Correct answer.

Explanation

Dedicated measuring devices, proper PPE, and positioning upwind reduce the chance of splashes and inhalation during handling of concentrates. Never estimate volumes or use hands for rinsing.

Question 46Pest Management and Pesticide Use (core)

What is the purpose of a pesticide's restricted-entry interval statement for workers who are not applicators?

  1. It specifies how long workers must stay out of a treated area to avoid exposure Correct answer.
  2. It defines the product's mixing ratio
  3. It sets the maximum wind speed for spraying
  4. It lists the pests the product controls

Explanation

The restricted-entry interval protects workers from residues by requiring them to stay out of the treated area until the interval has elapsed. Entry before that time requires label-specified protections.

Question 47Pest Management and Pesticide Use (core)

An applicator is comparing two products with the same active ingredient, one formulated as an emulsifiable concentrate and one as a wettable powder. Which consideration is most relevant to product choice?

  1. Solvent effects on sensitive foliage and compatibility with the spray carrier Correct answer.
  2. The price of the sprayer
  3. The number of nozzles on the boom
  4. The color of the container

Explanation

Emulsifiable concentrates contain solvents that can injure sensitive foliage, while wettable powders may leave visible residue and require agitation. Matching formulation properties to the crop and carrier is the key decision.

Question 48Pest Management and Pesticide Use (core)

A pest outbreak follows the removal of hedgerows and flowering borders around a field. Which explanation best fits an IPM analysis of this outcome?

  1. The crop's nutrient balance changed
  2. The pest species became resistant overnight
  3. The pesticide label required the hedgerows to be removed
  4. Natural enemy habitat was reduced, weakening biological control Correct answer.

Explanation

Hedgerows and flowering borders shelter predators and parasitoids that suppress pests, so removing them can release pest populations from biological control. This illustrates the value of conserving natural enemies.

Question 49Pest Management and Pesticide Use (core)

An applicator finds that a product's labeled rate no longer gives acceptable control even though the pest is correctly identified and the equipment is calibrated. Which conclusion is most defensible?

  1. The pest must be a new species
  2. The tank must be leaking
  3. Resistance or an application factor such as timing or coverage should be investigated Correct answer.
  4. The label rate must be doubled

Explanation

Poor control with correct identification and calibration points to factors such as resistance, mistimed applications, or inadequate coverage. Each should be investigated before changing practices.

Question 50Pest Management and Pesticide Use (core)

A grower applies a broad-spectrum insecticide that also kills pollinators and natural enemies, and later sees a secondary pest outbreak. Which explanation best accounts for this result?

  1. The secondary pest became immune to all chemicals
  2. Natural enemies that had suppressed the secondary pest were removed Correct answer.
  3. The product fertilized the secondary pest
  4. The sprayer applied too little carrier volume

Explanation

Broad-spectrum products can eliminate natural enemies that keep secondary pests in check, allowing those pests to increase. This is a classic unintended consequence of disrupting biological control.