Evaluation of the Effectiveness of the Fungicide Comissar Against Rice Pyricularia

Abstract

The results of research on the effectiveness of the fungicide Comissar are presented, EC (active agents propiconazole, 300 g/l and tebuconazole, 200 g/l) against rice Pyricularia, in the conditions of laboratory and vegetation experiments. The experiment was conducted in 2016-2017 in the Primorsky Territory. The fungicide was used at the consumption rate of 0.3 l/ha and 0.4 l/ha one time. In the primary laboratory tests on pure culture Pyricularia oryzae a high inhibitory activity of the drug against the coastal population of rice Pyricularia was revealed. It is noticed that Comissar significantly inhibits the growth of fungal colonies in all tested concentrations. Treatment of the nutriculture medium with solutions of the drug provides a significant preventive effect on the development of P. oryzae compared to an untreated control. The effectiveness of the drug was 100% on the 7th day and 89.3-90.4% on the 14th day. It was found that the use of the drug as a fungicide for the treatment of vegetative rice plants significantly reduces the development of Pyricularia. Comissar has a high biological efficacy against the pathogen at 47.4% (0.3 l/ha) and 62.7% (0.4 l/ha). The use of the fungicide contributed to the active growth of plants and it increased the main productivity indicators: the length of the panicle by 2.08-32.17 cm, the number of filled grains by 3.0-4.5 pcs. and their mass by 0.21-0.24 g per plant, as well as the mass of 1000 grains by 4.91-5.51 g. The maximum reliable increase in grain yield by 3.77 g/vessel was obtained in the variant using a fungicide at the minimum consumption rate.