The role of protective shelterbelts as an ecological factor in the regulation of phyto-sanitary state of oil crop fields

In recent years there is observed the acute degradation of the phytosanitary and ecological state of oil crops sowings in Krasnodar region. The shelterbelts play a big role in improving of Phytosanitary state of the studied crops as ecologically friendly factor. There was studied a colonization of sunflower, spring rapeseed, oil flax plants by pests in depending on the proximity of these crops sowings to protective shel- terbelts. It is shown that the average number of bugs in sunflower sowings is 98.5 insects per a plant, crucifer fleas on rapeseed - up to 15.0 insects per a plant, and on oilseed flax - up to 25.0 insects per a plant, in sowings being at a distance about 25 m from the thickened shelterbelts. In removing the sowings of these crops about 400 m from the shelterbelts, the populations of studied pests reduced up to 0.6 and 5.5 insects per a plant, respectively. Thinned and cleaned shelterbelts helped to reduce the number of phytophages from 3.1 to 182 times.