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jiao root mites first occurrence and control methods

Head. Department of flour mite infestation blast sent the results. First, the morphological characteristics of mites lifetime egg, larva,[link widoczny dla zalogowanych], if the number of mites and insects such as mites and mite body length of states around 0.5ram. Mouth, ■ dark brown. Forehand and rear body are known to have a significant constriction of the pattern. The back of a rear body of large and one small yellow or light brown markings. Each side of a kidney-shaped light brown spots. Posterior body setae on each side two out of the body, the body end of the 2 pairs of bristles. Carotid body developed. Clamp-like sting limbs, to be very small limbs, head covered by a pair of bristles into the eight-shaped mouthparts out front. 4 pairs of feet, shorter, sub-section. After the first 2 pairs of legs than 2 on foot thick, each of the hind tibia tarsus has a long terminal seta. Eggs oblong or kidney-shaped. Colorless, transparent, piles or scattered or semi-products of corruption in the corruption of roots and bulbs Lei head (or scale) within the organization and its adjacent robust gap between organizations. Larva is about 0.1mm in length, oblong, colorless, transparent, 3 pairs of legs. If the mite body length 0.2 ~ 0.3ram, oval, milky white, transparent or translucent,[link widoczny dla zalogowanych], tan feet and on device. . Second, the performance of mite damage hi and wet, a cluster of mainly live in the roots and bulbs Lei head between fresh slices. When it sneaked into the roots and damage within the time scale, so that the roots and bulb soft rot, and become final only stay thousands of shriveled skin, resulting in shoot dry Ling. Rain and soil moisture in large cases, some of them caught up to the base at the time and sneak into the leaf chamber damage, the formation of many spots on the leaf scars. The leaf from the base of the soft rot Zhedao. Killed bulb, often on a scale few hundred adult head. As many as several thousand head. Visible change bulb rot and dead leaves surrounding soil and ground layer of white powder on the clouds tilting - mites groups. Mite reproduction rate is high, generations overlap. Damage occurred in the eggs of the common, larva, adult, mites exist if the seedling (】 O ~ 11 months) when the temperature and humidity as appropriate. Damage began, sporadic Simiao 1 following spring. From mid-March, increasing damage, 5 to 6 months to form the peak damage, severe land (especially the old Lei first places) appears broken into pieces or the whole stem Simiao garden, cut 90 or more. Light damage land,[link widoczny dla zalogowanych], Lei Tau delayed, long delay, small size and small, poor quality. Third, the prevention and control technology 1. Soil, seed stems per hectare,[link widoczny dla zalogowanych], even after treatment withdrawal plowing applied sulfur powder 37.5 ~ 75kg and lime 375 ~ 750kg. Then rake the full uniform. Amoy applied per hectare before sowing or fertilizing granules of Carbofuran 3 3O ~ 37.5kg (can also be mixed with the kind of fertilizer applied), and then planting. Kinds of stem injury failure to remove the bulb or scales, and mites grams with 20 EC 1000 ~ 2000 times dipping IOmin (or even seed dressing), can also be used 2000 times 50% methamidophos EC seed dressing. 2. Control seedlings in the seedling stage before winter and spring the blade next year,[link widoczny dla zalogowanych], when the damage occurred sporadically in dead leaves up to 5% to 10%, the per hectare of these drugs (mites grams or methamidophos) 750g of pour stump, but also mixed with the fertilizer applied. 3. Agricultural practices through the mite species with stem mass, there are addicted to habits of corruption, and if the mites can form dormant bodies. Therefore there can be long in the soil, grain rotation Huancha to head to avoid decomposition of the manure is not applied. To completely clear the harvest, leaves, concentrated fire. L1 of 1993, f, 1,,
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