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 masters 1. Grasp the rules of spawning and pay attention to the application site. The bollworm lays eggs at the top of the cotton plant, on the young leaves of the fruit branches, on the bud pedicel and on the lobe. 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. Grasp the laws of incubation and pay attention to timely prevention and treatment. It is necessary to strengthen the forecasting of cotton bollworms and master the 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 or three generations of cotton bollworm eggs can hatch within three 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 and pay attention to the time of application. It has been observed that most of cotton bollworms are actively feeding at 8-11 and 15 o'clock, but rarely at high temperatures during the 12-13 o'clock period. Therefore, the application time should be better during the active feeding time. Do not apply drugs at high temperatures, high temperature on the application of volatile decomposition, not only the operator is easy to poison, 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. Do not use a pesticide continuously to prevent the bollworm from developing resistance to the drug. 2. Pay attention to pesticide compounding. 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. Pay attention to the preparation of pesticide concentration. 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 used is very close to the pest control effect. The amount of liquid used is small, and the effect of pest control on cotton plants is poor. Each 667 square meters of liquid used 40-50 kilograms, the cotton plants with uniform medicine, the effect is good.
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