What is phytotoxicity?

• A. Plant damage resulting from a pesticide application
• B. Pesticide residue on soil
• C. Insect feeding damage
• D. Growth stimulation of leaves

Answer: (A)

Phytotoxicity is the plant damage caused by a pesticide application. It describes how the chemical can injure plant tissues, leading to symptoms like leaf burn, spotting, necrosis, chlorosis, or stunted growth, even when the product is used as directed. This is the best description because it specifically reflects injury to the plant itself from the pesticide, not residues in soil, damage caused by insects, or an unintended growth boost. Pesticide residue on soil refers to remaining chemical in the soil rather than acute injury to plants; insect feeding damage comes from the pest, not the chemical harming the plant; growth stimulation would imply a positive growth response, which is not what phytotoxicity denotes. To avoid phytotoxicity, always match the product to the crop, apply at the correct growth stage and rate, and consider environmental conditions and drift risks.