Experimental investigation of ways to increase efficiency of breeding grain moth
2020
Krutyakova, V., Engineering and Technology Inst. “Biotechnicaˮ, Hlibodarske, Odessa reg. (Ukraine) | Molchanova, O., Engineering and Technology Inst. “Biotechnicaˮ, Hlibodarske, Odessa reg. (Ukraine) | Bulgakov, V., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Rucins, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Biological ways to control agricultural pests and weeds (without the use of chemicals) meet current trends in organic farming. Technologies and technical means for the production of entomophages are widely in demand; yet their development so far is in the initial stage. The conducted research allowed improving the technology and equipment for these purposes. In the studies barley was chosen as a food substrate for the moth larvae. The viability of the larval stage was determined by the percentage of the infected grains. These experimental studies were carried out in triplicate, ensuring statistical significance. All the other indicators were determined according to generally accepted methods, with the presence of controls. As a result of the conducted investigation, the optimisation efficiency of the structural parameters of the artificial population of the cereal moth (Sitotroga cerealella Oliv.), which is a substrate for the reproduction of trichograms and other entomophages, was experimentally proved. A relationship has been established between the viability of the biomaterial and the penetration depth of the larvae into the substrate. Application of this selection method during 3 and 6 generations has led to an increase in the biological indicators of the descendants. Based on these studies, it was determined that increase in the density of population of the grain with eggs of the grain moth in the parent culture led to an increase in the viability of caterpillars and pupae of the offspring. The caterpillar viability increased by 5.4 % after 3 generations of selection and by 11 % after 6 generations of selection. Determination of the biological indicators was carried out in the fourth and seventh generations. Viability of the pupae increased by 23.1 % and by 9.9 % after 3 and 6 generations of selection, respectively.
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