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Injury characteristics, larvae damage rapeseed, cabbage and other cruciferous vegetables, eating leaves into a short cut or holes, severe leaves are eaten, bite off the growing point, resulting in lack of seedlings and ridges and even destroy seed.
Morphological characteristics: The adult male is about 6mm long, and the female is 8mm; the head is black and the top has a crescent-shaped yellow spot; the compound eye and tentacles are black and stick-shaped; the chest is yellow, well-developed, and the middle has a "convex" shape black spot. Each side has 1 small black spot, yellow-brown cobwebs, small scutellum and elytra intercostal black; head, chest, abdomen, ventral surface and 3 pairs of feet are black. The head is deeply embedded in the chest, with a rough point, and the antennae reach back behind the sheath wings. The frontal thoracodorsal plate is wide, and the posterior edge is arched in the middle. The surface is densely engraved. Small scutellum semicircular. The coleoptera engraved females have large abdomen with the ends exposed outside the elytra. The egg is long and oval, 1.8mm long, yellow to orange.
The final larvae are about 10-13mm in length. The back is black-brown, spindle-shaped and light yellow on the ventral surface; the head is dark brown, with dark brown on the front and the end of the abdomen. The back of each section has three rows of dark brown sarcoma of different sizes with bristles on the tumor. Bare beak light yellow to orange yellow, long 6 to 7mm.
Living habits? Gansu, Shaanxi, Shanxi and other provinces were born 1 year old, and they laid eggs in the top soil of the rape roots, in the earth seams, in the soil blocks or in the dead leaves. Hunchun rape began to hatch when it turned green. The larva stage was 4th instar, and oil raisins, mustard, and cabbage were infested from late March to early May. The larvae happily harmed from 8 to 17 hours and lurked under clods at night, morning and evening, and rainy days. The larvae are happy and have a feign death. After the beginning of May, the mature larvae drilled into the earth-building chamber at 2-6cm and emerged as adults after 10-15 days. In late May, it enters the eutrophic period and the adults continue to infest after unearthing. After the yellow rape is ripe, the adults sneak into the soil at 10-22cm at the end of summer. From late September to mid-October, the adults return to injure their seedlings. From early October to November At the beginning of the year, the females spawned their eggs in the root seams of the rapeseed roots, and 20-40 pieces were gathered into small piles. Each female laid 200 eggs. In early November, the males died more than the ground.
Prevention methods. Grasp the timing of spraying insecticide 1 soil application, every 667m2 with 2.5% phoxim powder 2kg mixed fine soil 30kg, when sowing into the soil surface, and then dig into or turn into the soil, can prevent overwintering adults and overwintering Egg block. 2 After the rapeseed was unearthed and it was overwintering, when adults were found to be infestation in the field, spray 2.5% phoxim powder 1–1.5kg to eliminate the adult worms and prevent spawning and wintering. 2 Before returning to rapeseed, check the density and hatching rate of eggs regularly and regularly. Within each m2, there is a pile of eggs. The hatching rate is higher than 80%. Before the rape is returned to green, the 2% Badan powder is sprayed off at the initial stage of larvae. 667m21.5-2kg. 4When rape is found to be infestation during the period of pod emergence, spray 50% phoxim EC 1500 times or 50% malathion EC 1000 times, 2.5% kvitterin EC 1500 times, 20% chloramphenicol 1500-2000 times liquid, 0.6% flavescens nicotine alcohol solution l000-1500 times.
Rape Leaf A
Entomoscelis suturalis Weise, also known as black-striped rapeseed leaf beetle, belongs to the order Coleoptera. The common name is Baum, black cockroach. Distributed in Hebei, Shanxi, Shaanxi, Jiangsu, Gansu and other endangered rape, cabbage, mustard, cabbage, cabbage, radish and other cruciferous vegetables.