The scientific name Chrysaspidia festucae (Linnaeus) Lepidoptera, Noctuidae. Alias ​​gold wing moths, worms, worms, etc. Distributed in various rice regions throughout the country. Damage to the main rice, wheat, barnyardgrass, Aegilops mellifera, Trilobata, etc. Injury characteristics The larvae feed into the grazing, especially the first generation larvae are seriously damaged in the seedlings and vegetables, affect the tillering into the ear. Overwintering larvae are also harmful to wheat. Morphological characteristics Adult body length 13-19mm, wingspan 32-37mm, head red-brown, chest back reddish brown, abdomen light yellow-brown. The fore wings are yellow-brown in color with light golden spots in the trailing area and end area of ​​the base. The inner horizontal line and the outer horizontal line are dark brown. There are two large silver spots in the middle of the wing surface. The hind wings are light yellow-brown and yellowish gray. Egg height 0.45mm, width 0.6mm or so, bread-shaped, with about 40 longitudinal edges, colostrum white, later yellow green to dark gray. The last instar larvae are 31-34mm long, green or blue-green, dorsal line blue-green, subline, lateral line white or yellow-white, smaller, wider valve line, yellow, 1, 2 pairs of gastropod foot degeneration. Clam length 17-19mm, you can see adult stage markings, back with a bouquet, hip spines 2 sides, l on the hook-like small thorns. Life habits Heilongjiang, Ningxia, 2-3 generations old, Jiangsu 4-5 generations. Larval larvae live at the base of wheat plants, etc. Overwintering adult moths from Jiangsu in the early winter of May are prosperous in the first half of May, the first generation of late June and late July, the second generation of late July and early August, the third generation of late August and late September, the first Four generations in late September and mid-October. Ningxia Sheng moth is in early June in late July and late August and early September. In July in Ningxia, the egg period is about 5 days, the larval period is 1 month, and the flood period is 17 days. From June to August in Jiangsu, the egg period is 4.5 to 6 days, the larval period is 18 to 20 days, the flood period is 6 to 8 days, and the adult period is 6 to 10 days. Adults have phototaxis, like mating and spawning in the middle of the night. Eggs are produced on leaves, leaves, or leaf sheaths. Larvae 5-7 years old, individual 12 ages. The larvae of the 1-3 instar larvae drooped and the winds spread. The food intake of the 5th and 6th instar larvae drastically increased. The larvae of the last instar larvae were on the back of the leaves. Summer cool seasons are heavy. Natural enemies include gold winged beetles, yellow hairy veins, sparrows and frogs.
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Prevention methods (1) Do a good job of forecasting work. Pre-winter and post-winter selection of 5 representative early-winter wheat fields to check the number of overwintering larvae and issue timely forecasts to prevent the worm from becoming a disaster. (2) Pre-winter and early spring suppression of warts in time to kill some of the larvae and reduce the source of insects. (3) In severely damaged areas, 50% of dichlorvos EC may be sprayed with 1500 times or 2.5% of trichlorfon powder at the time of larvae bloom, and 22-2.5 kg per 667m.
