Illinois State Florists' Association #414
Phytotoxicity is plant damage that is caused by applications of pesticides. Pesticide phytotoxicity may occur in one or a combination of ways; the 5 types of damage that occur most often are as follows: 1. Plant "burn" — may appear on the tips or margins of the leaf as spots, or the entire leaf may be burned. The growing tip or bud may be killed. 2. Chlorosis — tip or marginal yellowing (bleached appearance) or spots, or a yellowing of entire leaf. 3. Abnormal growth — excessive growth, distortion or reduction in number of certain parts such as flowers, fruits, etc. 4. Stunting —Entire plant size reduced or size of parts (roots, fruit, etc.) reduced. 5. Leaf distortion — abnormal crimping, curlings or cuppings of the leaf. New growth is most likely to show spray damage, although any part of the plant may be affected. Soil drenches may injure roots causing stunting or slow plant decline. Soil drenches may damage foliage, but usually the older foliage shows the damage rather than the new growth.
Keywords: Burn Chlorosis stressed plants Abnormal growt Dosage rates