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Pratense moth form moths in the family crambidae polyphagous pest. Pronounced sexual dimorphism males are smaller than females. The front wings are colored gray-brown color they are located brown spots and yellowish stripe along its outer edge. Coating of rear wings gray. In males the antennae serrated females whiskers.
After mating the female lays between 30 and 300 eggs up to a maximum of 600 eggs. The female lays eggs on the undersides of the leaves of fodder trees 2-3 groups at least one by one. The duration of the egg stage 2-15 days. Caterpillar at the end of its development reach a length of 35 mm. Larvae are highly variable ranging from light green to gray-green sometimes almost black. On the back and sides are dark bands. Head is black with a light pattern. First tracks are on the leaves under the tangle of threads silky later in life begin to feed is already open eating leaves and sometimes stems. Caterpillars overwinter in cocoons in the soil. The pupal stage lasts between 7 to 38 days. Coloring pupa can be from light yellow to dark brown.
Kind distributed in Europe Asia and North America. The high number was observed in Bulgaria Romania the highest number observed in the forest-steppe steppe zones and the southern part of the taiga zone. Butterflies webworm observed in more northern areas in extensive periods mass outbreaks line and reached St. Petersburg. However unsuitable climatic conditions lead to the extinction of the pest in these areas within one or two generations. The absence of a favorable for the development of the moth food supply and not too favorable climatic conditions in the Baltic countries Fennoscandia and Kamchatka allow us to consider these regions only as the territory of a possible introduction of the pest in the years of mass reproduction where he is unable to maintain their long-term development.
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