PHYTOTOXIC INTERACTIONS INVOLVING METRIBUZIN AND OTHER PESTICIDES IN TOMATOES

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Abstract
Metribuzin was tested for phytotoxic interactions with 16 pesticides on tomato (Lycopersicon esculentum, Mill. ’Heinz 1706’). Synergistic phytotoxic interactions were repeatedly observed with metribuzin in combination with either malathion or carbaryl under growth room conditions. Additive phytotoxicity to tomato was commonly observed with metribuzin plus chlorothalonil, diazinon or demeton but few interactions were observed with metribuzin in combination with 11 other pesticides. Under field conditions synergistic phytotoxicity was observed with metribuzin plus carbaryl but not with metribuzin plus malathion. In growth room studies, synergistic interactions with either carbaryl or metribuzin could be avoided if the application of the insecticide was delayed at least 3 days after metribuzin application. Malathion or carbaryl did not increase the foliar penetration of metribuzin but pretreatment of tomato plants with either insecticide did inhibit the metabolism of metribuzin in tomato leaf tissue.

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