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Epidemiological studies to improve the control of grapevine downy mildew plasmopara viticola


, : Epidemiological studies to improve the control of grapevine downy mildew plasmopara viticola. Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 86(8): 489-498

Besides incubation periods, the following factors are important for the development of a Plasmopara epidemic: infection conditions (temperature sum during the wetness period at least 50.degree. C .times. h); sporulation conditions (darkness, at least 13.degree. C and 98% relative humidity in the canopy); viability (maximum of 6 h at temperatures above 30.degree. C); dispersal of sporangia (only by wind-blown rain). The climatic factors can be recorded with a simple temperature-leaf-wetness recorder. With these data the optimum time for treatments can be more accurately calculated.

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Related references

Lafon, R.; Raise, G.; Bugaret, Y., 1973: Trials of fungicides to control grapevine downy mildew, Plasmopara viticola. Of several new and experimental fungicides tested none gave better control of P. viticola than maneb at 280 g/hl or 2% bordeaux, used as the standards for organic and copper fungicides, respectively. The organocopper products tested were at least...

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