Truncate leafhopper

The scientific name Tetranychus truncatus (Ehara) is the order of the eye, leafhopper family. Synonyms Telarius. Alias ​​cotton red spider, cotton leafhopper. Distributed throughout the country.

Host corn, sweet potatoes, cassava, beans, melons, cotton, eggplant and so on.

Injury characteristics: If the scorpion and adult cicada cluster together to absorb the sap from the back of the leaves, the leaves are grayish or withered yellow spots. When the leaves are severe, the leaves dry off, affect the growth and shorten the result period, resulting in reduced production.

Morphological characteristics into a female 0.5mm long, body width 0.3mm; dark red, oval, corpus callosum and foot white, body side with dark spots. The male body is 0.35mm long and has a body width of 0.2mm. The stem of the penis is wide. The distal end is bent to the back to form a tiny-end hammer. The back edge is truncated. The end l/3 has a depression. The internal angle of the hammer is blunt. Sharp cut.

Life habits are 10-20 years old. In North China, winter eels are overwintering in earth seams or on litter. In Central China, wintering takes place on various weeds or in bark seams. In southern China, winter temperatures continue to breed due to high temperatures. In the early spring of the following year, the temperature is higher than 10°C. Overwintering and reclamation begin to multiply, and some migrated into the jujube or vegetable fields in late April to mid-May. The damage was jujube, eggplant, beans, cotton, and corn. Spots occur and spread to the surroundings. On the plants, the lower leaves are damaged first and then spread upward. When the number of breedings is large and large, they often cluster at the ends of the leaves or stems and branches, and the ground is blown away by the wind to spread and spread. Those who injure the jujube trees are most likely to breed in mid-June, late-July and July. The temperature is 29-31°C and the relative humidity is 35%-55%. It is generally harmful in June-August and the relative humidity is higher than 70%. Suppression. There are two types of natural enemies, the Tengjima and the giant mustard, which should be protected and utilized.

Prevention and control methods For the prevention and control principles, see Sakisaki. When the weather is dry, it is necessary to pay attention to irrigation and rational fertilization (reduction of nitrogen fertilizer, increase of phosphate fertilizer) to reduce damage. In the event of a major occurrence, chemical control is mainly adopted. It can use 25% antimony 23 (N23) EC 500-600 times or 73% GE Emulsion 1000-2000 times, 25% COC wettable powder 1000-1500 times. Liquid, 20% Scanweed Emulsion 2000 times, 2.5% Uranus Emulsion 3000 times or 5% Nissorange 2000 times, 20% Amitraz Either 1000-1500 Times, 1.8% Ding (BA-1) EC anti-insecticide acaricidal agent 5000 times, 10% imidacloprid wettable powder l500 times, l5% Ling Ling (broom net, Altair) EC 2500 times. About once every 10 days, continuous control 2-3 times.



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