The efficiency of induced resistance under practical culture conditions 1. powdery mildew of grape vitis vinifera cultivar mueller thurgau cucumber cucumis sativus cultivar chin schlangen and wheat triticum aestivum

Schoenbeck, F.; Dehne, H.W.; Balder, H.

Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 89(4): 177-184


Accession: 006669815

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Nontoxic metabolite substances, so-called inducers, produced by some bacteria and fungi are able to induce in plants nonspecific resistance against diseases caused by rust, downy and powdery mildew. The efficiency of these inducers against powdery mildew [Uncinula necator, Erysiphe cichoracearum, E. graminis] of grape, cucumber and wheat was proven under practical culture conditions. The trials were performed in a vineyard of the Mosel valley [West Germany], in a commercial wheat field and in a greenhouse. The inducers, the properties of which were not improved by formulation, were applied in the same way as fungicides. Compared to the untreated control plants, mildew appeared delayed on the grape leaves of inducer-treated plants. The intensity of the infestation decreased markedly. The grape wood was also less infected, but the berriers were not sufficiently protected. The inducers were able to control mildew on cucumber to a high extent. Also in the wheat field, the mildew infestation was reduced by > 90% with 5 applications of the inducer. The grain yield of the very susceptible cv. Caribo increased by .apprx. 20%. Compared to a commercial systemic fungicide, the efficiency of the inducers was poor in grape. In cucumber and wheat, however, they were able to control powdery mildew nearly to the same extent as the fungicide.