On the efficiency of induced resistance under practical growing conditions I. Powdery mildew on grapevine, cucumber and wheat

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

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


Accession: 000941970

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Non-toxic metabolic substances produced by a bacterium and 2 fungi were tested [RPP 60, 4063]. Infection by Uncinula necator was delayed on grapevine leaves in a vineyard of the Mosel valley after treatment with inducers, although grapes were insufficiently protected. Erysiphe cichoracearum on glasshouse cucumber was extensively controlled. E. graminis f.sp. tritici in a wheat field was reduced by > 90% after 5 applications and grain yield of the susceptible Caribo was increased by 20%. Compared with systemic fungicides, control by the inducers was poor on grapevine; on cucumber and wheat, however, they were almost as efficient as the fungicides.