Control of powdery mildew disease by some fungicides of different chemical groups and their side effect on squash [electronic resource].

Includes references.

Seeds of squash (Cucurbita pepo Alexanderial var.) were genninated over two successive growing seasons at Gemmeiza Agricultural Research Station (EI-Gharbia, Egypt) and sprayed three times during the vegetative stage by half dose or dose of Afugan, Calixin, Tapas 100 and micronized sulfur fungicides fOT controlling powdery mildew disease. Spraying by the recommended dose of these fungicides did not increase the actual fungicide effectiveness (AFE) over that of Afugan (74%). On the contrary, directed squash metabolism towards synthesis and accumulation of stress metabolites affected its normal growth and yield processes. Chlorophyll pigments of squash leaves were sensitive to the fungicides, especially chlorophyll b. Chlorophyll a and b decreased at (lit dose treatment, while half dose increased chlorophyll a and decrer.sd chlorophyll b. Sugars and protein contents of squash plants also decreased and Afugan and Sulfur caused the minimum decrease.

Summary in Arabic.

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