Efficacy of insecticides against wheat thrips Haplothrips tritici Kurd. in winter wheat crops

Abstract

Goal. To develop an effective system of winter wheat protection against wheat thrips Haplothrips tritici Kurd. Determine the technical effectiveness of insecticides Karate Zeon 050 CS, SC (lambda-cyhalothrin, 50 g/l); Match 050 ES, CE (lufenuron, 50 g/l); Enjio 247 SC, CS (thiamethoxam, 141 g/l + lambda-cyhalothrin, 106 g/l); Talstar, 10% CE (bifenthrin, 100 g/l); Mospilan, VP (acetamiprid, 200 g/kg); Inazuma, VG, (acetamiprid, 100 g/kg + lambda-cyhalothrin, 30 g/kg) in the Southern Steppe of Ukraine.
 Methods. The experiment was set up on winter wheat crops in 4-, 5- and 8 replications in 4x replication. The plots were arranged by the method of randomized blocks. The pest was counted by sampling 20 ears of wheat, which were placed in paper bags, tightly closed, delivered to the laboratory and counted live and dead adults by analyzing each ear for all samples from each experiment. Larvae were counted by the method of distillation using selectors.
 Results. To control the number of thrips, the effectiveness of the insecticide Engio 247 SC, CS at four application rates (0.05, 0.1, 0.15 and 0.2 l/ha) and Karate Zeon 050 CS, SC; Inazuma, VG; Match 050 ES, CE; Mospilan, VP; Talstar, 10% CE was studied. As a result of observations of changes in the number of thrips during 2017—2019, it was found that its appearance on winter wheat crops occurs from May 08 to 24. Peculiarities of weather conditions influenced the dynamics of thrips numbers. The duration of individual phases of wheat thrips development by years depending on the GTC was studied. The studies revealed the main patterns of wheat thrips population development and showed the possibility of controlling its number with the help of various insecticides.
 Conclusions. The use of insecticides Match 050 ES, CE; Karate Zeon 050 CS, SC; Talstar, 10% CE; Mospilan, VP; Inazuma, VG at consumption rates of 0.3 l/ha, 0.2, 0.1, 0.075, and 0.24 l/ha, respectively, on winter wheat crops against wheat thrips in the phase — «beginning of earing» (VVSN 51) effectively controls the number of thrips and provides technical efficiency of 93.7—96.1%. The use of the insecticide Engio 247 SC, KS at consumption rates of 0.05 l/ha, 0.1, 0.15 and 0.2 l/ha provides technical efficiency of this drug against pest larvae at the level of 90.2%, 94.7, 95.9 and 96.4%, respectively.