Abstract

VěCHET, Lubomír  and  ŠERA, Božena. Effectiveness of both synthetic compounds and biological extracts against powdery mildew (Blumeria graminis f. sp. tritici) on winter wheat. Agrociencia [online]. 2015, vol.49, n.1, pp.77-85. ISSN 2521-9766.

The objective of this study was to evaluate the effectiveness of foliar application of various synthetic compounds and biological extracts against powdery mildew on wheat. Seed coats of winter wheat were treated by synthetical compounds (benzothiadiazole, salicylic acid, and glycine betaine) or by the extracts from plants (oak, giant knotweed, curcuma, and ginger). Then the seeds were planted using small-field experiments with powdery mildew infection (repetitions over a two-year period; experimental field in Ruzyne, Prague). Leaf area infection was measured and the Cumulative Proportion of Leaf Area Diseased (CPLAD) was calculated. Data were analysed using ANOVA (Tukey test, p≤0.05). Effectiveness of preparations varied 30 % to 72 % in 2008, and 25 % to 65 % in 2009. The most effective synthetical compound was benzothiadiazole and the most effective biological extract was one from giant knotweed in both years (p≤0.05). Besides, plants treated with salicylic acid or glycine betaine had the least activity against powdery mildew (p≤0.05). Effectiveness in both years of cultivation was (p>0.05) similar, which indicates good stability of the biological extracts used. These findings suggest that these biological extracts may be a good preparation for using in organic farming.

Keywords : biotechnology; curcuma; giant knotweed; ginger; infection; oak.

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