Tea Tree Black Locust

Scientific name Aleurocanthus spiniferus (Quaintance) Homoptera, Fructus. Alias ​​orange thorn whitefly, thorn whitefly, black thorny thorn whitefly. Distribution of Jiangsu, Anhui, Henan, south to Taiwan, Guangdong, Guangxi, Yunnan.

Host tea, oil tea, citrus, wolfberry, apple, pear, grape, persimmon, chestnut, longan, banana, olive and so on.

The traits of nymphs are as follows: nymphs sucking leaves, fruits, and twigs of sap. The tainted leaves appear chlorotic yellow and white spots, and the aggravated spots that are harmed expand into pieces, and then the whole leaves pale and fall early; the flavor quality of the damaged fruits is reduced, and the young fruits are seriously damaged. It often falls off. Excretion of honeydew can induce coal pollution.

Morphological characteristics Adult body length 0.96-1.3mm, orange, thin powder. Compound eye kidney red. The forefinger is purple-brown with 7 white spots; the hind wings are small and light purple-brown. Egg crescent, 0.25 mm long, blunt at base, with 1 small shank, erect adaxially to leaves, yellowish colostrum, yellowish, grayish black before hatching; nymph body length 0.7mm, black, body back 14 pairs of bristles, with a clear wax circle on the periphery of the body; a total of 3 instars, a pale yellowish-yellowish-yellowish color, and 6 light-colored bristles on the back of the body; the body is gradually gray to black, shiny, and secreted by the body at the periphery White wax; 2 instar yellowish black, 9 pairs of bristles on body back, apparently white wax circle around body.蛹 Oval, colostrum yellow gradient black. Clam shell oval, 0.7-1.1mm long, shiny black, jagged edge of the shell, the edge of a wide margin of white wax, the back was significantly raised, the chest with 9 pairs of long thorns, abdomen with 10 pairs of long thorns, two The side edge females have 11 pairs of long thorns and 10 pairs of males.

Life habits Anhui, Zhejiang, 4th generation, Fujian, Hunan and Sichuan 4 - 5 generations, are nymphs in the leaves over the winter. Overwintering nymphs phlegm in March and emerge from late March to April. Generations are irregular, and field status can be seen from the middle of March to late November. Generations of nymphs in each generation: the first generation from late April to June, the second generation from late June to mid-July, the third generation from mid-July to early September, and the fourth generation from October to February. Adults prefer a darker environment, many activities in the crown of litchi leaves, eggs scattered in the back of the leaves, scattered or dense arc-shaped, a few to dozens of grains together, each female can spawn dozens of grains to hundred Yu granules. The newly hatched nymphs crawled and sucked around the eggshells. They were 3rd instar and 2, 3rd instar fixed parasites. Egg period: 22 days for the first generation, 10 to 15 days for the 2-4 generation. Non-overwinter nymphs are 20-36 days old. The flood season is 7-34 days. Adults live 6-7 days. Natural enemies include ladybugs, grasshoppers, parasitic bees, and parasites.

Control methods (1) Strengthen the management of reasonable pruning, so that good ventilation and light transmission can reduce the occurrence and damage. (2) Before germination in early spring, the combination of control of locusts, aphids, and spider mites and spraying of 5% diesel emulsion or clay diesel emulsion will have a good effect in killing overwintering nymphs. (3) Chemical control during growth period: The spraying effect is good at the l2 instar age, and can be sprayed with 50% of rice oil in Fengfeng San 1500-2000 times, 80% of dichlorvos or 40% of dimethoate or 50% of phosphatidylcholine, 50% Malathion EC, 50% Caesarean Loose Emulsion 1000x, 10% Uranus EC 5,000-6,000 times, 25% Quercive 5,000ml, 20% Imidacloprid (Confod) Concentrate Solvent 3000-4000 Times of liquid, 20% swept lecithin 2000 times, 1.8% Gaiqike EC or 1.8% Virulent EC or 1.8% eIfing EC 4000-5000, 5% sharp Special suspension agent 1500 times, 10% buprofezin EC 10oo times. For the prevention and control of all instars at and after 3rd age, it is best to use the mineral oil emulsion containing 0.4% to 0.5% of oil to mix the above mentioned agents, which can increase the insecticidal effect. Single use of chemical pesticides is not effective. (4) Pay attention to the protection and introduction of natural enemies.

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