Abstract

 Various crops and long-term plantings in Ukraine (Zhytomyr, Kiev, Chernihiv, Khmelnytskyi and Vinnytsia Regions) have been observed for the purpose of identification of the natural centers of entomopathogenic nematodes (EPN) of the genera Steinernema and Heterorhabditis (Nematoda: Rhabditida) — the natural regulators of the number of harmful insects. The reasons and conditions, determining the nature of EPN distribution have been analyzed (Steinernema, Heterorhabditis). The results of the nematologic analysis of 206 soil samples (and traps) had showed that 27 (13.1%) among them turned out to be positive concerning EPN. The conducted examinations of garden and field biocenoses have showed that they are occupied by entomopathogenic nematodes unevenly. On identification frequency, representatives steinernematidae representatives prevailed over heterorhabditis nematodes (55.6% against 44.4%).
Highlights
In modern conditions, the basis of the vast majority of the systems of crops protection against harmful organisms in the intensive systems of cultivation is based on the use of pesticides
Till the middle of the 50s of the 20th century a large number of scientists all over the world did not pay to entomonematodes special attention, in comparison with other potential bioagents. Over time, this look began to change, and the set of the researches conducted by scientists in different countries of the world was shown that Entomopathogenic nematodes (Steinernema, Heterorhabditis) have those practical qualities, which provide a possibility of creation of biological medicines of a new generation on their basis
Numerous researches showed that entomopathogenic nematodes (EPN) (Steinernema, Heterorhabditis) are non-uniformly wide-spread, and it is impossible to specify a certain set of the factors, allowing solving the problem of EPN distribution, connected with the type of the area or the level of area transformation, as a lot of biotic and abiotic factors of the environment influence EPN distribution, activity and pathogenicity
Summary
The basis of the vast majority of the systems of crops protection against harmful organisms in the intensive systems of cultivation is based on the use of pesticides. Entomonemathologic inspections, entomopathogenic nematodes, genus Steinernema, genus Heterorhabditis, identification frequency, agrocenoses, plant protection, harmful insects
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