Monitoring of the species composition of spring wheat pests in the North-East of Kazakhstan

Abstract

To prevent losses of wheat yield from pests, it is necessary to update information on the patterns of formation of the phytosanitary situation in agrobiocenoses, according to which protective measures are planned and organized. The aim of the scientific study is to monitor the phytophages of spring wheat according to ecological and geographical zones in the North-East of Kazakhstan (on the example of Pavlodar region). In the course of research, the evolutionary-ecological strategies of adaptations and life cycle tactics of phytophages in spring wheat crops, their trophic relationships, migration routes from crops to stations, and vice versa, influence of weather conditions of the growing season on reproduction, nutrition and their activity in agrocenoses, depending on the development phase of wheat were studied. The results obtained showed that starting from the germination and up to the stem elongation phase, cereal crops were colonized by latent-stem pests and Phyllotreta vittula. Schizaphis graminum, Psammotettix striatus, Trigonotylus ruficornis and Haplothrips tritici dominated in the stem elongation and heading phases. Haplothrips tritici in two forms (larvae and adults) and Schizaphis graminum dominated in the phase of grain formation-filling and milk development phase. The study showed that during the initial phases of wheat development, the majority of pests develop and feed on wild weed plants, subsequently migrating to the cereals. Thus, the conducted spring wheat crops research identified a complex of dominant crop pests (Haplothrips tritici, Chaetocnema hortensis, Phyllotreta vittula, Trigonotylus ruficornis, Psammotettix striatus) in the conditions of the North-East of Kazakhstan, but their distribution in general across the districts of the region and for different precedings is uneven.