The scientific name is Dichocrocis punctiferalis (Guenee), Lepidoptera. Also known as Peach Blemish, commonly known as Peach heartworm insects, Peach Gardeners. Its distribution ranges from Heilongjiang and Inner Mongolia to the south, to Taiwan, Hainan, Guangdong, Guangxi, and South Yunnan, to the east of the former Soviet Union and North Korea to the east, and from West Shanxi to Xixia to Ningxia and Gansu to the west, and then to Sichuan. Yunnan, Tibet.
Host sorghum, corn, millet, sunflower, ramie, ginger, cotton, peach, persimmon, walnut, chestnut, fig, pine and so on. In recent years, sorghum has been harmed in some provinces and regions, and hybrid sunflower oil and corn have become heavier. This should be paid attention to.
When the sorghum damages the sorghum, the adults lay their eggs on the sorghum panicles that spawn and raise the flowers, spawning 3 to 5 grains in one ear, the newly hatched larvae enter the young grains of the sorghum, and seal the mouth with fecal matter or food residue. Harm inside, eat one capsule and turn another one until the third instar. After the third instar, the spun silk nets were conjugated with spikelets in the middle of the spikelets, and they passed through the foraging grain in the inside, seriously foraging the sorghum grains. In addition, stalks can also be used. See corn borer for damage. When corn is harmed, it mainly feeds on the ears of the ear and can also stem the stem. The rate of affected plants reaches 30%-80%. The eggs are produced at the joints of tassels, ears and leaf sheaths from the autumn corn tasselling to the wax ripening phase in Sichuan Yibin. Or positive and negative ears, up to 1729 eggs per hundred.
Morphological characteristics Adult body length 12mm, wingspan 22-25mm, yellow to orange, body, wing surface with many black spots like leopard: thoracodorsal there are 7; abdomen back l and 3-6 have 3 courses, There are only one section in section 7 and no black spots in sections 2 and 8. There are 25-28 front wings and 15-16 rear wings. The male end of section 9 is black and the female is not obvious. Egg oval, 0.6mm long, 0.4mm wide, rough surface of the cloth with fine dots, white colostrum orange, reddish brown. Larvae body length 22mm, body color changeable, light brown, light gray, light grayish blue, dark red and other colors, abdominal mostly pale green. Dark brown head, brown scutellum on the chest, gray buttocks on the buttocks, distinctly hairy segments, greyish brown to black-brown, with large bristles on the back, 6 on the 1st and 8th abdomen above the throttle, and 2 courses. Before the 4 after 2. The valve is oval in shape, and the valve flap is dark brown. Abdominal toe hook irregular 3 order loop. The length is 13mm, and it turns brownish after the first yellowish green, and the hip spines are slender with 6 twisted ends.茧 long oval, gray and white.
Life habits Liaoning born 1-2 generations, Hebei, Shandong, Shaanxi 3 generations, 4 generations in Henan, 4 to 5 generations of the Yangtze River Valley, are mature larvae in corn, sunflower, ramie and other residual strains in winter. In the late May to late June, the first generation of larvae in Henan Province was damaged by peach trees, and the 2-3 larvae were damaged on peach trees and sorghum. The fourth generation was damaged by summer sow sorghum and sunflower. The fourth-generation larvae passed the winter, the overwintering larvae larvae quailed in early April, and they entered the late-middle of April. The larvae plagued in late April and were eclosed between the end of April and the end of May. Overwintering adults laid eggs. Produced on peach trees. From mid-June to late June, a generation of larvae larvae emerged. The first generation of adult larvae began to appear in late June. In early July, it entered the peak of eclosion, and the second generation of eggs followed. At this time, spring pods were planted and spiked, and in mid-July, they were 2 generations. The larvae are at their height. The second generation of eclosion is in the middle and early August. At this time, the spring sorghum is nearly mature. The late sowing spring sorghum and the early sowing summer sorghum are heading and raising the flowers. The adults are concentrated on these sorghum to lay eggs. The third generation egg is at the end of July and the beginning of August. Incubation occurs in the middle and late August and enters the third generation of larvae. At the end of August, three generations of adults emerged, and in mid-September, they entered the peak period. At this time, sorghum and peaches have been harvested. Adult eggs are laid on sorghum and late-maturing sunflowers in late summer and enter the fourth generation of larvae from mid-September to early-October. During the second half of October, when the temperature dropped, the fourth-generation larvae were overwintering. In the Henan egg generation period of 8 days, 2 generations of 4.5 days, 3 generations of 4.2 days, overwintering 6 days; 1 generation larva duration of 19.8 days, 2 generations of 13.7 days, 3 generations of 13.2 days , 208 days of overwintering, 5 instar larvae; 8.8 days in 1 generation in flood season, 8.3 days in 2 generations, 8.7 days in 3 generations, 19.4 days in overwintering generation; 7.3 days in generation of adult worms, 2 Generation 7.2 days, 3 generations 7.6 days, overwintering 10.7 days. Adult larvae lurked during the day and lurked in the sorghum field to supplement their diets. They laid eggs on sorghum that sprung up and spawned eggs. The eggs produced only 169 eggs per female. The newly hatched larvae intruded into young grains and blocked the pods. The hole is damaged in the grain, and then turned into a grain after being hollowed. After the third age, the spun silk net conjugates the spikelet, which causes damage in the tunnel and severely hollows the whole grain. The larvae were overwintered in the panicle or leaf bud, leaf sheath, dead leaves and sorghum, corn and sunflower stalks after ripening. Heavy rainfall occurs in many years. Natural enemies have Astragalus immigration bees, the majority of leg wasps.
Control methods (1) Pre-winter sorghum and maize are to be emptied of grain, and the stalks, cobs, and sunflower disks of sorghum, corn, sunflower, etc., are treated in time. (2) In the spawning period, spraying 50% phosphine water solvent 1000-2000 times liquid. (3) Promote the spraying of Bacillus thuringiensis 75 to 150 times or 100 to 200 times.
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