Apple leafhopper is a common pest in apple production. It has few individuals and breeds rapidly under high temperature and drought, which seriously affects the normal physiological functions of apple leaves. There are three main types of orchards in the orchard. That is, hawthorn spider mite, two-spotted spider mite and apple fruit moss. These three species have experienced four insect states in one generation, namely eggs, juveniles, nymphs and mites, in which the eggs are wintering eggs and summer eggs. At present, the prevention and control of it mainly adopts chemical prevention and control methods. In order to better apply acaricides and improve the control effect, the prevention, control, application time and efficacy of common acaricides are as follows:
Thiophenone : It has high activity on eggs and nymphs, low activity on adults, slower on efficacy, and reaches a peak effect period of 40-50 days after 7-10 days after application. It is recommended to use before flowering. Commonly used dosage forms are 5% emulsifiable concentrate and wettable powder, and the dosage is 1000-1500 times.
Tetrapyridazine : It has good effect on egg control, and it has certain activity on Ruoqi. It has poor effect on sputum formation. Tetrapyrazine has a slow effect, and it can show better control effect 10 days after administration. The duration of effect is up to 50- 60 days, it is recommended to use before flowering. The commonly used dosage form has 20% suspension agent, and the dosage is 1500-2000 times.
Qi Ling : It has good control effect on eggs, young cubs, Ruoqiang and Chengyu.哒螨çµæ€è™«, fast control effect, effective period of up to 30 days, it is recommended to use before flowering. The commonly used dosage forms are 15% emulsifiable concentrate and 20% wettable powder, and the dosage is 1500-2000 times.
Triazolyl tin : It has good effects on Ruoqiang, Chengyu and Xia Ou, but it is not effective for overwintering eggs. Triazolium has good quick-acting effect and long residual effect. It is recommended to use before and after bagging (wheat harvest). The commonly used dosage form is 20 % wettable powder, dosage 1500-2000 times.
Azathioprine : It has good control effect on eggs, juveniles, nymphs, and mites. Zymphoyl ester is fast-acting and has a potency of more than 30 days. It is recommended to use after flowering. Commonly used dosage forms have 5% suspension agent, and the dosage is 2000-3000 times.
Avermicide : It has good control effect on adult mites and ruthenium, but it does not kill eggs. It can simultaneously treat pests such as golden moth, leaf miner, aphid and leaf miner. Abamectin has strong permeability and residual effect. Long period, it is recommended that apples be used after bagging. The commonly used dosage forms are 3000-4000 times of 1.8% emulsifiable concentrate and 5000-6000 times of 3.2% emulsifiable concentrate.
Spiro-ester : It has good activity on eggs and nymphs. It has the best effect on eggs. Although it does not kill females, it can kill them. The snail ester has a long-lasting effect of 40-50 days, but the price is high. Conditional orchards are recommended for use before flowering. Commonly used dosage forms have a 24% emulsifiable concentrate of 4000-5000 times.
Note: mites are very resistant to acaricides, and it is recommended to use a variety of acaricides. Do not use the same acaricide twice a year. It is not recommended to use emulsifiable concentrate before the flower is dropped to the sheath. Improper use will affect the smoothness of the fruit surface.
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