Pest Identification and Management
Sound pest management begins with correct identification - of the pest, its life stage, and the crop or site - before any product is chosen. Candidates should understand integrated pest management (IPM): combine cultural, mechanical, biological, and chemical tactics, and use chemicals as one tool rather than the only tool. Key concepts include economic threshold (pest density at which action pays), action threshold, monitoring/scouting, and resistance management (rotating modes of action, avoiding repeated use of one chemical class).
Know pest categories and their control implications: insects (chewing vs. piercing-sucking; targets differ by life stage), weeds (broadleaf vs. grass; annual vs. perennial; pre-emergent vs. post-emergent timing), plant diseases (fungal, bacterial, viral - often managed preventively because curative options are limited), and vertebrates (often requiring exclusion or habitat modification). Traps in questions: treating a symptom without identifying the cause; applying a post-emergent herbicide for a weed that should be hit pre-emergent; and ignoring pollinator timing, since many products are hazardous to bees during bloom.
Rule of thumb: identify first, scout to threshold, then select the least-risk effective tactic - and rotate modes of action to slow resistance.
Worked example: A scout finds aphids (piercing-sucking) below the economic threshold. Correct action is to continue monitoring rather than spray; if the population crosses threshold, choose a labeled product and note its mode of action for rotation next time.