Spodoptera exigua
Scientific name Amphipoea fucosa (Freyer) Lepidoptera, Nightingale. Distribution of northeast, north, northwest, Tibet Plateau, the middle and lower reaches of the Yangtze River and East China wheat. General production cuts of 10% to 20%, severely reduced by 40% to 50%, are important wheat pests in spring wheat area. Hosts such as wheat, barley, wheat, alfalfa, alfalfa and other grass crops and wild oats. The larvae are affected by irrigated land, wetlands, and clay soil blocks. Before the 3rd instar drilled stems were damaged. After the 4th instar, they were gnawed and eroded from the ground of the wheat straw and inhabited in the thin earthworm to continue to damage the nearby wheat strains. As a result, the wheat showed dead heart or whole plant death, resulting in lack of seedlings and ridges. Morphological characteristics Adult body length 13-16mm, wings 30-36mm, head, chest yellow-brown, gray back belly, ventral yellow-brown, rust rust yellow to gray-black, light-colored base, 2 inside and outside, midline 1 Article, a total of 5 brown lines and obvious. Ring, kidney white to rust yellow, brown lines on the fine lines, dark brown edges, sub-line color light, brown outer edge, ciliary hair yellow-brown. The hind wings are gray-brown, and their margins and wings are grayish yellow. Eggs are semicircular, white, and turn brown after 3 or 4 days. The last instar larvae are 30-35mm long, grayish-white, yellow-headed, surrounded by black-brown edges, 4 dark brown spots from the middle to the rear, and red-brown on both sides of the dorsal midline from the back of the chest to the abdomen. One broadband. The subline is slightly finer, and the valve line is thicker, all of them are red-brown. Abdomen before and after Section 8 There were 2 black-brown spots and 6 dark brown spots on the back of the ninth abdominal segment. The middle two were large. Tan tan, 2 tails, curved hooks at the ends. Control methods (1) Reasonable rotation, deep-turning the land to eliminate eggs and destroying eggs, centralized burning can reduce the source of insects. When the depth of the ground is more than 15 cm, most of the newly hatched larvae cannot be unearthed. (2) Watering in the wheat three-leaf stage. At this time, the newly hatched larvae are at the height of the flood season and can be reduced after watering. (3) In adulthood, large-scale black light traps are used to trap adult worms before spawning. (4) In severe areas or fields, 4% phoxim granules or 0.5% thiophosphorus granules are applied with sowing, 2-3kg per 667m2, and the control effect of newly hatched larvae is more than 80%. (5) The larval stage can be used 80% crystal trichlorfon 1000 times or 36% cloning emulsifiable concentrate 1000-1500 times solution root. Tetrandrine Herb,Tetrandra Extract Powder,Cas 518-34-3,Tetrandrine 98% Shaanxi The River Pharmaceutical Co., Ltd. , https://www.dahepharma.com
Life habits North Spring Wheat Region 1 year old, wintering with eggs, hatching in mid-May in the following year, hatching in late May and early-June, and larvae infesting wheat seedlings in mid-May and mid-May. In the late period of the winter, wheat was till the jointing stage and entered the larvae. The mature larvae larvae in late June. Adults appeared in mid-July and mid-August, and they entered the peak of the moths in mid-August. In the middle of July, there were visible egg masses in the wheat fields. From mid-July to mid-July, they entered the spawning period. Adults are hidden on the edge of the ground, under the canopy of grass or under field crops or earth seams during the day and fly out of the feeding in the evening. After mating, the eggs are produced on the inside of the wheat stem base sheath at a distance of 1 to 3 cm from the soil surface at 20-21 in the evening. Three to twenty-one eggs were produced per female, and 90 to 400 eggs were laid. Eggs were arranged in two to three rows and each was about 30 eggs. The duration of egg laying was 5-8 days. The larvae have stolons and have the characteristics of underground pests. The larvae period is more than 50 days, and the general molting is carried out 5 times. After ripening, the larvae can be sterilized within 1 to 3 cm of soil in the vicinity of the affected plants, and the pupa period is about 20 days.