Эффективность акарицидов в борьбе с клещом Blattisocius tarsalis в технологии массового разведения зерновой моли Sitotroga cerealella

Abstract

Eggs of Sitotroga cerealella are widely used as feed for the production of entomophagous insects. Predatory mite Blattisocius tarsalis inhabits the production facilities, damages eggs and negatively impacts moth development. This reduces the effectiveness of breeding technologies using grain moth eggs, a natural substitute for natural food. The specific problem of predatory mite control in biotechnological production is that the product must kill the mites without adversely affecting the main product – grain moth eggs. For this reason, the search for modern acaricides for the control of B. tarsalis in S. cerealella egg production has arisen. The efficacy of modern acaricides against B. tarsalis was assessed in laboratory experiments: Vertimek, EC (18 g/l); Ortus, SC (50 g/l); Sanmite, EC (150 g/l) and Floramite, SC (240 g/l). The greatest toxic effect was obtained with pyridaben (Sanmite, EC). The preparation at a concentration of 0.2 % not only caused 100 % mortality of ticks within the first 24 hours after application, but was also virtually safe for S. cerealella larvae hatching from treated eggs. In biotechnological production conditions, it is advisable to use flat, sealable plastic containers, the outer and inner surfaces of which are treated with an acaricide. After the working solution has dried, a thin layer of grain moth eggs, infested with mites and previously immobilized in a household refrigerator, is sprinkled into the solution and exposed for 1–2 days. The use of an acaricide should complement the preventive and sanitary measures taken when producing grain moth eggs.