The herbicide metribuzin is registered for use on tomatoes ( Lycopersicon esculentum Mill.). It is applied either preplant incorporated or postemergence. However, severe injury occurs when postemergence applications are made during low light conditions (1,2, 4, 5, 6). UGA 1113MT and UGA 1160MT are being released as sources of tolerance to metribuzin; both lines have exhibited excellent tolerance (no injury) to metribuzin applications (up to 16-times the recommended rate of 1.12 kg/ha) made during cloudy weather. Chemical name used: 4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4- H )-one (metribuzin).
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Phatak et al. (1985) studied this question.
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