The scientific name Mampava bipunctella Ragonat is from the order Lepidoptera. Alias ​​螟 螟. Distributed in North China, East China, South Central, Southwest and other places.
Hosts millet, sorghum, corn, rice dumplings and so on.
The larvae are characterized by their larvae feeding on the millet, sorghum, and panicles. They feed on the web and feed on the grains. The seeds of the panicles are empty and the color of the panicle head is dark, accompanied by broken kernels and fecal pellets. And can continue to damage after the food into the warehouse.
Morphological characteristics Adult body length 7-llmm, wingspan 21-27mm, body, fore wing white, reddish, fore-wing front with 5 small black spots, the center of the room and the end of each of a black spots; hind wings white, Translucent without spots. Egg length 0.5mm, oval, milky white at the time of first birth, then yellow to grayish brown. The last instar larvae have a body length of about 20 mm, waxy yellow, and 2 light brown lines on the back of the chest and abdomen. The dragonfly is 10-12mm long, long-spindle-shaped, slightly pointed at the end, yellow-brown, without tails.
Life habits are 2 generations in North and East China, and 1 to 3 generations in southwest China. The mature larvae spend winters in millet or sorghum panicles, around the scene, and in the gaps in the warehouse. In June of the same year, Huabei and Huadong were euthanized in the first half of July and emerged in the middle and early July. The first generation of larvae was endangered from early July to early August. The second generation of larvae was endured from mid-August to early September. The adults of Yangzhou, Jiangsu, wintered and spawned in early July. The first-generation larvae infested the spring sorghum in mid-late July. The mature larvae spawned and plucked on the ear, and the pupa period was 6-7 days. From July to early August, one generation of adult eclosion emerged. The second generation of larvae infested the summer sorghum. In early September, the larvae of the mature larvae were overwintering, and individual larvae, feathers, and spawning occurred. The third-generation larvae were planted late or late matured sorghum. Adult phototaxis is strong, night activities, like to produce eggs in the half-sleeve ear or earing fresh ear, each 2-3 tablets, 200-300 eggs per female, egg period 3-4 days, larvae were 6 instar, Duration 24-28 days. The newly hatched larvae first bite a small hole at the top of the grain and drill into the grain to damage it. After the second instar, they can turn grains, and each larvae can eat 30-40 grains. The occurrence of this worm is closely related to the meteorological conditions. In all years, the number of overwintering insects, the warm winter weather, and the summer rainfall are more severe. In the middle of August, the rain was even, the rainfall was more than 100mm, and the number of rainstorms was few, and the second generation was likely to be heavy.
Prevention methods (1) In the scene of drying sorghum and millet ears, weeds are stacked around to induce larvae to crawl in. In the morning, the larvae under the weeds are crushed and killed by stone scorpions. (2) Grasp 25% of insecticidal bi-quenches 500 times or 50% of chlorpyrifos 2000 times, 2.5% of deltamethrin buttermilk 4000 times, 42% before egg hatching or 2 larvae Telik 2000 times solution, effective control of the worm and sorghum safety. Gao Di is sensitive to trichlorfon, dichlorvos, and slaughtered pine. It produces phytotoxicity after use and should not be used in production.
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