Comparison of fungicidal programmes in cereals, different in their intensity, currently used in the Czech Republic
Tvaruzek, L.(Agricultural Research Inst. Kromeriz (Czech Republic). Dept. of Integrated Plant Protection)E-mail:[email protected]
Three separate field experiments were established to screen fungicidal efficacy of selected, widely used fungicides against leaf diseases of winter wheat, to compare the possibilities of controlling Fusarium head blight (FHB) and DON mycotoxin accumulation and to look for relationship between fungicidal effects and breadmaking quality parameters. The leaf rust (Puccinia recondita), septoria leaf blotch (Septoria tritici) and powdery mildew (Blumeria graminis) development was compared in variants protected with one, two or three treatments differing in the dose of active ingredient. There were highly significant yield differences between the models of one or two treatments and the best septoria leaf blotch control after three treatments made with reduced rates of fungicides. The use or avoidance of treatment with a fungicide at the growth stages DC 37-DC 47 was more important than the type of preparations (active ingredients). A good possibility of combining special products against FHB (triazoles) with some active ingredients from strobilurin group (trifloxistrobin) was effective in suppression of diseases as well as in reduction of DON mycotoxin. A significant influence of weather conditions in particular years on parameters of breadmaking quality was found: falling number, test weight, and final protein content. The test weight was higher in variants treated with fungicides than in the non-treated check in all experimental years.
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