Influence of Single Applications of Fungicides on Net Photosynthesis of Pecan

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Abstract
Single-fungicide spray treatments were applied to mature leaves of greenhouse-grow pecan seedlings [for control of Cladosporium caryigenum]. Six of 8 fungicides tested reduced net photosynthesis (PN) 1 day after treatment by 25-35%. These 6 fungicides continued to reduce PN 9 days after the single spray treatment. Propiconazole and etaconazole had no effects on PN. Benomyl reduced PN 1 day after treatment but had no effect after 9 days. Triphenyltin hydroxide (wettable powder and flowable), fenarimol, chlorothalonil and dodine had relatively long-term detrimental effects.

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