Three keys to improve the efficacy of cotton bollworm control
Improving the control of the efficacy of cotton bollworm is an effective way to reduce investment and reduce costs. Three keys should be grasped. One or three master 1. Master the rules of spawning and pay attention to the application site. The bollworm lays eggs on the top of the cotton plant, on the young leaves on the top of the fruit branches, on the bud pedicels and on the temporal lobes. Therefore, the focus of the application should be on the top of the cotton plant and on the tender tips, bud pedicels and temporal lobes of the fruit branches. 2. Master the rules of incubation and pay attention to timely prevention and control. It is necessary to strengthen the forecasting of cotton bollworms, and to grasp their spawning peaks and incubation rules. The incubation pattern is that the eggs are white in color, yellow in two days, dark in three days and hatched in four days. Two days after hatching, the growth point was jeopardized, and the young buds migrated in four days. The appropriate period of prevention and treatment should be after the hatching peak, most of the eggs become black or before the hatching does not migrate better. 3. Grasp the law of feeding, pay attention to the application time. It has been observed that most of the bollworms are actively feeding at 8-11 and 15 o'clock, but rarely at high temperatures at 12-13 o'clock. Therefore, the application time should be better during the active feeding time. Do not apply at high temperatures, when the application of high temperature volatile decomposition, not only the operator is easy to poisoning, and poor efficacy. Dew application in the morning, the liquid concentration is easy to dilute loss, poor adhesion, poor efficacy. Second, three notes 1. Note that pesticides are used interchangeably, and several pesticides are alternately used in turn. Do not use a pesticide continuously to prevent the bollworm from developing resistance to the drug. 2. Pay attention to pesticide reconstitution. Pesticide reconstitution can improve drug efficacy and delay drug resistance of bollworm. When pesticides are reconstituted, care should be taken that acidic and alkaline pesticides cannot be reconstituted. 3. Note the preparation of pesticide concentrations. The formulation concentration of pesticides cannot be arbitrarily increased or decreased, and must be allocated in multiples according to the pesticide use instructions. Increase the concentration of cotton plants susceptible to injury, reduce the dosage will reduce efficacy. Third, increase the amount of liquid medicine, cotton plant uniform medicine. The amount of liquid medicine and pest control effect is very close. The use of small amounts of liquid medicine, cotton plants spray uneven application of pest control effect. When the second-generation cotton bollworm is controlled, 40-50 kilograms of medicinal liquid is used per mu, and three or four generations of cotton bollworm are used, and 80-100 kg of medicinal liquid is used per mu. The cotton plants are evenly distributed and the effect is good.
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