Impact of the Dividend Extreme, SC and its composition with Novochizol on the phytosanitary condition of seeds and crops of spring soft wheat

In 2020 and 2021, a study was conducted to investigate the effect of the dressing agent Dividend Extreme, SC and its composition with Novochizol on seed infestation and phytosanitary situation in the crops of spring soft wheat Novosibirskaya 31 cultivated on no-till leached chernozem. The experiment included 3 seed treatment options: 1) control (without treatment); 2) commercial fungicide Dividend Extreme, SC (Difenoconazole, 92 g/l + Mefenoxam, 23 g/l); 3) composition with a 13.4-fold reduced amount of active ingredients Dividend, Extreme, SC and Novochizol (Difenoconazole, 6.88 g/l + Mefenoxam, 1.71 g/l + Novochizol, 2.5% + succinic acid, 1.25%; the formulation was proposed by the N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS). High biological efficiency (93.3 and 100%) of seed treatment with Dividend Extreme, SC (consumption 0.5–0.6 l/t) against Bipolaris sorokiniana (Sacc.) Shoemaker (syn. Helminthosporium sativum Pam., King et Bakke; Helminthosporium sorokinianum Sacc.) was established. The reduced application rate weakened the protection effect by half. The biological efficiency of the composition with Novochizol was inferior to the commercial seed treatment with both reduced and increased application rates. Both preparations reduced the number of B. sorokiniana spores in the soil, but at the vegetative stage of plant development, their lower density was noted when treating seeds with Dividend Extreme, SC. In the milk ripeness phase, lower development of common root rot was recorded in both experimental variants with a predominance of efficiency from treatment with a commercial fungicide. It was found that protection of seeds with the fungicide composition Novochizol can indirectly (through growth stimulation of the host plant) affect the infestation of the leaves with both septoriose and brown rust, increasing the development of these diseases by 2.1 and 2.5 times.

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