The scientific name Pachnephorus lewisii Baly belongs to the order Coleoptera, Schott. Alias â€‹â€‹millet gray brown leaf A. In the past, it was mistakenly designated as Sufan. Distribution of Northeast China, North China, East China, South Central and Northwest China. Shanxi, Hebei, Henan, and Liaoning mill production areas are heavy.
Hosts include more than 40 species of plants in 14 families including Gramineae, Asteraceae, Leguminosae, Polygonaceae, Convolvulaceae, Lamiaceae, and Malvaceae. Guzi millet and small pot, and so on. Damage characteristics When the millet sprouts out of the earth, the adults are transferred to the valley and eat the growth points of the seedlings so that the seedlings die without being exhumed. This is commonly known as â€œrobbing the whiteâ€; when the leaves are uncovered when the leaves are green, they are bitten off from the base Qiu, causing damage. Dead seedlings, commonly known as "robberies," have caused the lack of seedlings and broken ridges, resulting in replanting or deforestation. Larvae also harm the young roots of the host.
Morphological characteristics Adult body length 2-3mm, nearly oval, brown or gray-brown, with a slight copper luster, body back was light brown and white scales, abdomen, foot gray scales, small head, bend forward and down, Tendon rosary, section 11. Section 1 is inflated into a spherical shape, 2-6 sections are thin, and the end is 5 sections wide. The pronotum is nearly circular, the base of the elytra is wider than the pronotum, and the elytra is irregularly engraved. Chest foot 3 equal lengths. In the midfoot, the posterior segment of the posterior segment of the athlete's foot had no space, the lateral part of the orbital side was semilunar, and the ventral aspect of the abdomen was visible in 5 sections. The length of the base section was equal to the sum of the remaining 4 sections. Egg length 0.5 to 0.6mm, oval, colostrum white, near the hatching darker. The last instar larvae are about 5mm in length with a slightly curved body, milky yellow, yellow-brown head, 13 axillary sections, 1 small section, slightly enlarged sections 9-11, and the other sections gradually tapering. Each section 4-7 has a pair. Small sarcoma, which has 3-7 fine hairs. 3 pairs of chest feet, short bends. The naked cubs are about 3mm long, white and dark, and there are no 2 spines in the abdomen.
Living habits Liaoning, Shanxi, 1 generation, 1 to 2 generations in North China, adults in the Tianbian under the clods, soil cracks, root crops and weeds in the roots of 5-6cm soil overwintering. In the northeastern 1st generation area, the overwintering adults started their activities in mid-to-late April, and they entered the middle of May in the middle of the unearthed period, that is, the field was damaged. In early July and late August, they entered the larval stage, and in late July and early September, they became larvae. Then adults emerge. In late September, the adult began to winter. In the second-generation region of North China, the adults of the overwintering winter have already begun to infest at the end of late February. In the late April and early May, they enter the peak period of adulthood, and they enter the peak period of damage. In early July and early August, the occurrence of second-generation larvae occurs. In late August and early September, eclosion occurs after phlegm-removal. In late October, it enters overwintering conditions. Sometimes the first adult is directly wintered. The adult life can reach 8 months. The spawning period lasts for more than 3 months. There are overlapping generations. The spring millet has not yet been exhumed. The worms feed on small quail or black cockles. When the grain seedlings are unearthed, they move into the field and the eggs are laid on the seedling roots or the weeds. In the 2cm soil layer, 140 eggs are produced per female. The egg period 9-13 days, the newly-incubated larvae in the soil 4-6cm Department of eating young roots, larvae period of about 30 days, after the old mature 4-5cm in the underground room for earthworms. The seven-day period. The insects are miscellaneous and like drought. Generally, the year of drought is prone to happen. Slopes, dry fields, and sowing depth are heavy.
Control methods (1) Agricultural control. Fall deep into the ground, to reach the level of soil without waste, in early spring to clear the fields, land, weeds, remove the root crops, leaves, defoliation, concentrated burned or buried, can kill a large number of overwintering adults. (2) Seed dressing with 50% seed phosphate or 40% methylisophos- phlore EC before seeding. Can also be used 40% Dimethoate EC or 50% phoxim EC 0.5 kg, 20 kg of water mixed with 200-300 kg of seeds, mix well after the heap stuffy, dry and sowing. (3) When sowing, 2 kg of 3% dianilamide granules are applied per 667 m2 to treat the soil. (4) After the adults of the overwintering period have started their activities, the pest situation shall be investigated in a timely manner. When there are 4-5 insects per m2, 4 to 10% of methyl iso-isoproxol EC should be used in time, and 10 to 15 kg of dry soil should be mixed. Mix and sprinkle around the plants. If necessary, spray 90% crystal trichlorfon or 50% parathion EC and 50% hexaflumuron EC 1000 times.
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