Scientific name Icerya purchasi Maskell Homoptera, Scrophulariaceae. Alias ​​Mian group, white, white and so on. Distribution of Liaoning, Hebei, Shanxi, Shaanxi, Shandong, Henan, Jiangsu, Zhejiang, Anhui, Sichuan, Fujian, Taiwan, Hubei, Hunan, Jiangxi, Guangdong, Guangxi, and Yunnan.
The host tea, mulberry, cotton, orange, apple, pear, peach, cherry, wolfberry, red bayberry, lemon, grape, persimmon, chestnut, pomegranate and other 250 kinds of plants.
Harmful characteristics The nymphs and female adult insects suck sap on the branches, buds, and leaves, and excretion of honeydew induces coal pollution. Weaken the tree's vigor, and the dead will die.
Morphological characteristics Adult female oval, body length 5-7mm, dark red or orange, black short hair on the back was uplifted by white powder, developed to the oviposition period, the end of the abdomen secreted white oocysts, 14- 16 longitudinal ridges, 4-8 mm long. The male body is 3mm long, orange-red, with dark spots on the dorsum of the thoracic sulcus. The antennae are like rosary-like black at 10 knots, purple-black on the front wings, and degeneration of the hind wings; 4 hairs grow on each of the abdomen. Eggs are long oval, 0.7mm long, orange-red. If the body is oval, eyes, tentacles and feet are black, and the body's back is covered with pale yellow wax powder. Male and female oval shape, 2.5-4.5mm long, orange-red. Long oval, covered with white wax powder.
Living habits in the East China and South China region 2-3 generations, Sichuan 3-4 generations, nymphs and female adults or a few female oocysts in the winter overwintering. The occurrence period is not neat. On the 2nd generation in Zhejiang, spawning began in March and entered the peak period in mid-May. The nymphs prospered from late May to early June, adults were observed in mid-June, and most were in mid-July; the second-generation egg was July. From early to mid-August, nymphs emerged in mid-July, and they can be eclosioned as early as the year, and spawning can occur in a few species, and winter nymphs are often used for 2 generations. The second generation of Fujian, Guangdong, and Taiwan occurred in July-August, the third generation in September-November, and a small number of fourth generations appeared in November after November. Taiwan completed about 80 days in summer and 130 days in winter. Spawning begins 6-11 days after mating, spawning period 5-45 days. The instar nymphs settled on both sides of the main vein of the back of the leaf. After the 2nd instar, they migrated to the trunk and became harmed. The female adults did not move after they settled. After mature, the oocysts spawned eggs, and each female could lay eggs hundreds to 2000. grain. There are fewer males and many parthenogenetic females, but overwintering males are more often found in tree gaps, in the back of leaves and in the soil. Overwintering females and male adults produce a lot of eggs after mating, and often occur in May-June. Natural enemies include Australian ladybugs, red ladybugs, red ladybugs, and parasites.
Prevention and control methods (1) Protection of Australian ladybugs, big and small red ladybugs, red ring ladybugs and so on. (2) cut off pests or brush insect body. (3) The tea tree is dormant during the dormant period. Lime sulfur, 45% crystal lime sulfur 30 times; north tea tree can be sprayed before germination 3-5 lime sulfur or 45% crystal lime sulfur 20 times, oil content of 5% of the mineral oil emulsion. (4) Control of the chemical resistance of newly hatched nymphs at the time of dispersion and transfer.
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