Control of Cucumber Foliar Diseases, Fruit Rot, and Nematodes by Chemicals Applied Through Overhead Sprinkler Irrigation

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Abstract
Application of fungicides through irrigation water was compared with application by tractor-mounted boom or downdraft sprayers for control of foliar diseases on cucumber. Chlorothalonil applied through irrigation water and applied with tractor-mounted sprayers provided equal disease control in a resistant cultivar where gummy stem blight [Mycosphaerella melonis] and target spot [Corynespora cassiicola] were the major diseases. When an epidemic of downy mildew [Pseudoperonospora cubensis] developed in a susceptible cultivar, chlorothalonil, mancozeb F and mancozeb WP were more effective in lowering the infection rate and reducing disease severity when applied by ground sprayers than when applied through irrigation water. Control of root-knot nematodes [Meloidogyne incognita] with a nematocide (phenamiphos) reduced fruit rot and increased yield in plots sprayed with chlorothalonil but foliar injury was so severe in unsprayed plots that nematode control was not beneficial.

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