<h1 class= "pgc-h-arrow-right" >1, harmful habits </h1>
Tea yellow mites are extremely heterogeneous, with adult mites or mites concentrated in the tender parts of the host to suck up the juice. Causes plant deformity. The back of the affected leaf is gray-brown or yellowish brown, with an oily luster, and the leaf edge is curled downwards; the affected young stem becomes yellowish-brown, distorted and deformed, and the top of the victim is dried up; the affected flowers and buds cannot flower and fruit in the heavy case; the fruit is damaged, the stalk and peel become yellowish brown, lose luster, and the wood is bolted; the affected plant leaves, flowers, fruits or fruit fission and taste, which not only causes a decrease in yield, but also reduces quality.
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Tea yellow mite occurs in 25-30 generations per year, and under greenhouse conditions, it can occur all year round. At 20-30 °C, 1 generation can be completed in 4-5 days, and 1 generation can be completed in 7-10 days at 18-20 °C. Open-field vegetable fields generally begin to pick up in mid-May and are in full bloom from June to September; protected areas begin to occur after October, and continuous breeding is harmful to overwintering. The largest amount of mites seen on the surface of the leaf is the one. The mite has obvious tenderness, and the amount of mites in the second leaf of the plant shoots accounts for about 90% of the total number of mites in the whole plant. The mite prefers warm and humid, in the shade, poorly drained plots. Occurs early and does great harm. High temperature has an inhibitory effect on the growth of this mite, and the lethal temperature is above 40 °C. Humidity has little effect on adults, and more than 40% of them can reproduce normally. However, eggs, young mites and nymphs hatch and grow normally when the relative humidity is above 90%.
<h1 class = "pgc-h-arrow-right" >2, prevention and control methods </h1>
(1) Agricultural control and control Of the stubble crops, the dead branches and leaves are removed in time after harvest to reduce the source of overwintering insects; in early spring, special attention should be paid to the removal of weeds such as dragon sunflower and clover in the solanaceous vegetable field to avoid the harm of the source of overwintering insects into the vegetable field; brominemethane or dichlorvos can be used in the shed to kill young mites or adult mites.
(2) Pharmaceutical control After planting slow seedlings in the shed, it is necessary to often check the insect situation, and start the prevention and control when it is found to be damaged. Prevent expansion from spreading. The spray focuses on the back of the young leaves, young stems, flowering vessels and young fruits in the upper part of the plant. Choose from 20% pyridazine thiophos emulsion, or 35% acaricide emulsion or 40% aqueous amine thiophos emulsion 1000 times liquid, sprayed once every 10-15 days, or 1000-2000 times liquid with 23% g mite emulsion, sprayed once every 20-25 days, or 5% nissolan emulsion or 15% sweep mite net emulsion or 50% bromo mite emulsion or 1. 8% efostin emulsion 2000 times liquid, these agents are effective against all stages of mite development, so the effect is remarkable. Note that Leguo and Oxidized Leguo cannot prevent and control tea yellow mites, and can also kill natural enemies and should be banned. (Source: Agricultural Expo Network)