Chemical control should be timed to when inoculum is most vulnerable.

• A. True
• B. False
• C. Only when inoculum is abundant
• D. Never in summer

Answer: (A)

Timing chemical control to match when the pathogen’s inoculum is most vulnerable is essential for effective disease management. Inoculum means the pathogen’s spore or propagule that can initiate infection, and its vulnerability is highest during stages like spore germination and the early infection window. Applying fungicides during this vulnerable phase intercepts infection more efficiently, giving better control and reducing waste and resistance risk. So the statement is true, while options suggesting you should only act when inoculum is abundant or never in summer don’t fit the timing principle that aligns treatment with when the pathogen can be most affected.