Pest Identification and Management
Integrated Pest Management
Pesticide application is one tool within integrated pest management (IPM). Know the IPM sequence: identify the pest, monitor with scouting and thresholds, prevent through cultural and mechanical controls, then use biological and chemical controls judiciously. Understand economic threshold and action threshold as decision points, and resistance management through rotation of mode of action groups (not just product names).
Identification Matters
Correct identification determines the control strategy. Distinguish insects (six legs, three body regions) from mites (eight legs, not insects), and know that weeds are managed differently by life cycle (annual, biennial, perennial) and by monocot vs. dicot morphology. Diseases are caused by pathogens (fungi, bacteria, viruses) and are influenced by the disease triangle: susceptible host, virulent pathogen, favorable environment. Misidentifying a disease as an insect problem leads to ineffective treatment.
Common Traps
Questions often test that a pesticide cannot compensate for poor identification or that treating below threshold wastes money and increases resistance. Another trap is confusing pre-emergent (applied before weed emergence) with post-emergent timing. Remember that beneficial insects can be harmed by broad-spectrum products, and that resistance arises from repeated use of the same mode of action.
Rule of Thumb
Identify first, monitor second, treat only at threshold, and rotate modes of action.
Worked example: A turf problem shows stippling and fine webbing; suspect mites (eight legs), not insects, and select an appropriate miticide rather than a general insecticide.