Comprehensive protection of winter wheat from harmful organisms of agrocenosis in the zone of the Polissya of Ukraine

Abstract

Goal. To study influence of complex application of fungicidal, insecticidal action on the dynamics of the number of harmful organisms and fusarium root rot on winter wheat crops under the conditions of the Polissya of Ukraine.
 Method. The research was carried out during 2015—2017 on the experimental field of ZNAEU with. Greater Gorbash Chernyakhivsky area Zhytomyr region. The cultivation of winter wheat was carried out in accordance with the Polissya zone of Ukraine. Sizes of experimental sites 50 m2, repetition — four times. The research was carried out on two backgrounds of mineral nutrition — F1 — N150P60K100, F2 — N210P84K140 of the active substance. Treatment of wheat seeds with fungicidal and insecticidal preparations was carried out one day before sowing. The accounting of damage to wheat plants by the dominant pests was carried out from the IV stage of organogenesis by the method of recording areas using the framework imposed on the plants. The accounting for fusarium root rot was carried out in the phase of full ripeness before harvesting. Samples of plants for analysis were excavated from two adjacent rows of 0.5 m and recorded on a scale: 0 points — the plant did not affect; 1 point — defeat to 30% of the roots and up to 50% of the stem base; 2 points — defeat 30—60% of the roots and more than 50% of the stem base; 3 points — defeat more than 60% of the roots.
 Results. As a result of research on winter wheat crops, where N150P60K100 of active ingredient (F1) was introduced, the number of cicadas changed from 28 to 92 spe/ m², corn flies decreased by 56 spe/m², corn aphids decreased by 40 spe/ m². its population for the complex processing of seeds Gaucho Plus 466 FS, TH (0.6 l/t) + Lamardor 400 FS, TH (0.2 l/t) + MikoHelp (1.0 l/t). The spread of fusarium root decreased by 22—23%, development — by 2.5—2.8% compared with the control variant. At higher levels of mineral nutrition N210P84K140 the grain yield increases from 3.5 to 5.8 t/ha, and the increase in yield was from 0.73 to 2.25 t/ha, which is 0.4 t/ha more than in the background of 1 in option Gaucho Plus 466 FS, TH (0.6 l/t) + Lamardor 400 FS, TH (0.2 l/t) + MikoHelp (1.0 l/t).
 Conclusions. Complex treatment of seeds with fungicidal and insecticidal preparations contributed to a decrease in the number of plant phytophages and a decrease in winter wheat damage by fusarium root rot. The combination of different standards of mineral nutrition and tank mixes for seed drilling improved the characteristics of the structure of the crop. The highest increment of yield was obtained at elevated norms of mineral nutrition N210P84K140 in combination with the use of a mixture of drugs Gaucho Plus 466 FS, TH (0.6 l/t) + Lamardor 400 FS, TH (0.2 l/t) + MikoHelp (1.0 l/t), which was 2.25 t/ ha compared with the control variant.