Summer temperature is high, rainfall is small, for the occurrence and reproduction of pests to create conditions, today to introduce you to a summer harm is very serious pests, this pest is the thrips, thrips are the summer and autumn occurs the most common, the most serious harm, one of the most difficult to control the pest. Can harm cucumbers, beans, eggplants, peanuts, corn and other dozens of crops, do not look at the thrips are small, the harm is more serious than aphids, coupled with its fast reproduction speed, strong ability to migrate, become the most difficult to control pests, a large number of crops are seriously damaged, making farmers friends very difficult headache, how to effectively control the harm of thrips?
Harmful symptoms
Thrips are mainly nymphs and adults, mainly harmful to the young leaves, young shoots, flowers and young fruits of plants, after the young leaves and young shoots are killed, many small white dots appear on the young leaves, and when they are serious, the leaf veins are damaged and the leaves cannot be unfolded. After the young shoots are damaged, the growth point becomes hard and curled, the growth rate becomes slower, the internodes are shortened, and when it is severe, it withers and dies; after the flowering apparatus is killed, white spots appear on the petals, which become brown in the later stage and gradually wither. After the young fruit is killed, the epidermis will be rough and hardened, and in severe cases, it will cause fruit drop, resulting in a decrease in yield and quality.
Habits of life
There are many types of thrips, small individuals, strong reproductive ability, generally can breed 10 to 20 generations a year, all year round can be harmful, especially in April to September, the harm is serious. Thrips like warm, arid weather, its suitable temperature is 23 ° C ~ 28 ° C, suitable air humidity of 40% ~ 70%, so every summer May to June and autumn September to October, the temperature is suitable, less rainfall, is the two peak periods of thrips. Thrips are afraid of light, hiding in flowers or in soil crevices during the day, and when there is no light in the evening and at night, they begin to go out and do harm.
New methods of prevention and control
Thrips have strong flight migration ability, fast reproduction speed, and fast spray control effect, but the duration is short, regular spraying is required, a large amount of labor costs and pesticide costs need to be invested, and the control effect is not ideal. Practice has proved that the method of root irrigation is not only simple to operate, but also has a longer effective period and better prevention and control effect. Can be in the early stage of thrips, combined with fertilizer watering, with 30% thiamethoxine suspension agent 300 ml / mu, with water flushing, or drip irrigation, due to the good absorption conductivity of thiamethoxine, stable in the soil, not easy to decompose, through the suction conduction, the agent is transmitted to various parts of the plant, can continue to kill the endangered crop of thrips adults and nymphs, the effective period of up to 50 to 60 days, greatly reducing the number of sprays.
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