Control of sugar beet leaf spot disease caused by the fungus cercospora beticola (Sacc) [electronic resource].

Includes references.

In an attempt to control sugar beet leaf spot caused by CefCOSpo18 belicola with certain chemicals i.e. copper sulphate, magnesium sulphate, potassium oxide, calcium+ magnesium as well as by biological (Trichodetmaalbum [BIo-Zeid] and Bacillus megaterium [Bia-Arc]) treatments beside two fungicides i.e. difenconazole Secore) and tetraconazole [Eminent) which were evaluated under laboratOlY and field conditions. Also, the effect of the tested treatments on some sugar beet characteristics ego leaf dry weight, root fresh weight, soluble solid content, sucrose content and purity of sugar was investigated. Results indicated that all tested treatments were effective against the causal fungus as indicated by disease severity and sugar beet yield characters. The fungicide tetraconazole was the most effective treatment against the disease, however, the two tested biocontrol agents shower considerable efficacy. The moderate efficacy of the tested biocontrol agents relative to fungicides suggested an integrated approach towards C. beticola, preferring tr application of the fungicide in the first phase of the disease, where as application either Bacillus or Trichoderma-based formulations in the later phases. The spray of calcium, magnesium or potassium against CefCOSpo18 beticola suggested the abilityof using such chemicals for controlling the disease either alone or mixed with the fungiCIdes to reduce the applied amount of fungicides.

Summary in Arabic.

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