By Bonnie L. Grant Phototoxicity in plants can rise from a number of factors. What is phototoxicity? It is anything chemical which causes an adverse reaction. As such, it can stem from pesticides, herbicides, fungicides and other chemical formulations. The plant’s response varies from discolored leaves all the way to death. The sensitivity can go both ways, however, since some plants are phototoxic to humans and can cause injury. What is Phototoxicity? Phototoxicity in plants usually occurs in those that are overly sensitive to chemicals. It can also occur when tank mixed chemicals are applied in hot weather or when an adjuvant or solvent is added to the tank mixture. Stressed plants are also more prone to sensitivity than those that are well watered and healthy. Phototoxicity can exist as a response to an external condition or as a defense to an external condition. As a response, it is manifested
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