How can you tell if a pesticide coverage is adequate in an area?

• A. Check foliage for visible residue
• B. Count pests
• C. Measure soil moisture
• D. Observe plant height

Answer: (A)

The key idea is to verify that the spray actually reached the plant surfaces where pests contact or feed. Seeing visible residue on the foliage shows the pesticide was deposited on the leaves, indicating adequate coverage on the plant where pests are likely to be. If you observe uniform residue, coverage is likely good; if leaves are clean or there are gaps, coverage may be incomplete and you may need to adjust the spray pattern, nozzle, or rate. Counting pests only tells you how many pests are present, not whether the spray reached them; soil moisture and plant height don’t indicate deposition on the foliage. So, looking for visible residue on the leaves is the best way to gauge adequate pesticide coverage.