Abstract
Rainfall affects the removal of fungicide from crop foliage, but it was not known whether the rainfall effect is strictly a function of total rainfall, or dependent on rainfall intensity and duration. This study aimed to determine if chlorothalonil wash-off predictions could be improved by knowing rainfall intensity and duration rather than just total rainfall for the rain event. Chlorothalonil was applied to potted processing tomato plants and allowed to dry for 5 h. Controlled rainfall experiments were performed in the laboratory under a rainfall simulator at rainfall intensities of 13, 25, 51, and 76 mm/h and rainfall durations of 10, 20, 30, 68, and 150 min. After the plants were dry, foliar samples were removed from the upper and lower canopy and chlorothalonil residue was quantified using an immunoassay. Rainfall intensity and duration independently affected removal of chlorothalonil from foliage, but total rainfall described more of the variability in the data.
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