Polyphagous pests
Outline I. Introduction II. Main body III. Conclusion IV. Reference Introduction Polyphagous pests or polyphagous, feeding on many species of plants belonging to diverse botanical families. They often have no shortage of food, so they often breed in large numbers and are dangerous agricultural pests. Most harmful to crops and vegetable crops, some representatives of the class of insects are Orthoptera, Coleoptera and Lepidoptera. Polyphagous pests Polyphagous pests include insects that feed on plants that belong to different botanical families. This group is represented by troops of Orthoptera, grasshoppers, crickets, beetles and butterflies. Orthopterans Common Mole (GryllotalpagryllotalpaL.). They have an underground lifestyle, and only occasionally appears on twilight and night. The natural habitat - moist and rich in humus or humus habitats, floodplains, coastal areas of lakes, marshes, ponds, soils with a high groundwater table, irrigated and well- fertilized fields. Among the most commonly colonizes agrocenoses garden plots. While making the moves in the upper layers of the soil, mole crickets gnaw the roots of plants. Polyphagous, feeding on field and vegetable crops, seedlings of forest and fruit crops. Overwinters in the larval and imaginal stages to a depth of 1 meter spring the female lays up to 360 eggs in a nest chamber at a depth of 10 to 20 cm The larvae live in the nest 20 to 30 days. The complete cycle of mole crickets lasts about two spring- summer seasons. Control measures. Each year, in deep autumn they plow between the rows and vegetable crops. Laid poison baits boiled grains of corn, wheat or barley. 1 kg of grain take 30 g of sunflower oil and 50 g of insecticide (metaphos, HCH). Corn oil is first treated and then pesticides and then thoroughly mixed and introduced at the rate of 60 to 80 kg / square meter at a depth of 3 cm in a large number of pests and use of appropriate granular insecticides. In home gardens Medvedka can catch by trapping pits with manure. Well (50X X50X50 cm) digging after harvest, stuffed them with manure and cover the ground.
|
