First, the characteristics of dry sowing insect pests occur in our area The dryness of wetlands in our area is dominated by cotton leafhoppers. Due to the fact that it is not possible to carry out the autumn and winter irrigation for successive years, the cotton leafhoppers can survive in winter in Daejeon, making the overwintering base a large number. Different from the past, the characteristics of cotton leafhopper migration from the middle of the strip field to the middle of the cotton field are that they can appear directly in the middle of the field, and the damage time is advanced. Basically, cotton is harmful when it is unearthed. In 2003 and 2004, a team of 20 teams in 5 teams had been on the field for many years in succession around May 20. There is also a similar phenomenon in individual teams of 1 team and 8 teams.
Dry sowing wet field cotton root distribution is relatively shallow, more sensitive to water and fertilizer, once the lack of fertilizer and cotton is easy to premature aging. When the control of cotton leafhoppers is not complete, they can be destroyed in a short period of time, especially in the middle and later stages of field management. Once an outbreak has a great impact on the yield.
Second, comprehensive prevention
1. The early investigation first used radio, board newspapers, and on-site meetings to mobilize employees for early investigation. Technical staff should ensure that every 5 to 10 days census, key plots can not exceed 5 days. Only in this way can the pest situation be grasped in the first place, so that prevention and treatment can be targeted to achieve the goal of early cure and small treatment.
2. Early prevention and control According to the prevention and treatment experience of cotton leafhoppers in recent years, if the cotton leafhoppers are not effectively controlled at the end of June, the difficulty of prevention and control after topping will be greatly increased.
The key to early prevention and control is intercalation and selective killing agents. In the mid-to-late census of mid-May, cotton fields with central strains were found and investigations were conducted on a membrane-by-membrane basis. The identified strains were inserted and marked with special acaricides. 3 to 5 days after the prevention and treatment of prevention and treatment of the effect, the effect is not retreatment. When using retreatment, special acaricides should be used alternately, and the same agent cannot be reused. The control effect is good to remove the mark, and for the prevention and control of the disease and the newly discovered central strain, different colors are used to distinguish the label. In 2004, five teams of 20 # field and one team of 42 # fields spent a lot of energy to insert the mark first, and then used the mark to mark the center of the plant to fight round. The two fields were marked with different colors and alternately used special acaricides. In the middle of June, the cotton leafhoppers were kept below the hazard level until the end of August.
3. In the middle and late stages of prevention and treatment, the cotton fields that have not properly controlled the cotton leafhoppers at the early stage and do not have the tendency to spread and spread, must be controlled before being tossed. The main points of prevention and control are low concentration and large amount of water. 667 square meters of water consumption of 50 kg or more. If you do not take timely measures, blindly emphasize the prevention and treatment of artificial spots, will miss the best time for prevention.
4. Make up the water to make up for the fat and prevent the cotton from the early stage of premature decay. The cotton is generally very weak. In the treatment with the chemical, water and fertilizer should be given at the same time, and the condition can be properly supplemented with foliar fertilizer. This will help improve the cotton plant's resistance to insects. The prevention of premature aging of cotton is the key to the prevention and control of cotton leafhoppers in the whole year. Once the cotton is prematurely decayed, the cotton leaf pods are likely to break out. It should be noted that the cotton fields damaged by cotton leafhoppers should not be short of water or fertilizer in the later period, and should be supplemented with foliar fertilizers, and the time for water stoppage should be postponed.
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