The Huanghuaihai region is the largest wheat producing area in China, and is also the main cotton producing area in China. Bollworms occur here for 4 generations a year. 90% of the first generation of cotton bollworm is harmful to wheat, and the second generation is mostly concentrated on cotton. The first generation occurred in the time of harm to wheat, generally from mid-May to early June. 55% of the eggs were produced on the spikelets on the spikelets, 25% on the cultivars, and 20% on the upper leaves. The larvae feed on the leaves and milking the kernels to complete the generational development. The occurrence of the first generation of cotton bollworms not only resulted in a reduction in wheat yield, but also accumulated a large number of insect sources for the second generation of cotton bollworms, leading to the occurrence of the second generation. Many years of investigation and research have shown that from mid-May to early June, the stock and development of the cotton bollworm larvae directly affect the occurrence and occurrence of the second generation of cotton bollworm in the cotton field. The first-generation prevention and treatment of wheat fields can not only ensure the increase of wheat production, but also greatly reduce the damage of the second-generation cotton bollworm in cotton fields. It is a good measure to kill birds with one stone.
At present, due to ignorance of agricultural prevention and control and adoption of single pesticides in many places, the resistance of the cotton bollworm has been increasing year by year, the control effect has been declining year by year, the environment has been polluted, and the human and livestock poisoning accidents have frequently occurred. The historical experience of China's agricultural development shows that the use of agricultural measures is the basis for the prevention and control of crop pests, and some agricultural measures are more ideal for preventing and controlling bollworm than the long-term effects of chemical pesticides alone. If the use of poplar branches to control the first generation and second generation of cotton bollworm, simple, environmentally friendly and efficient, can play a "kill one thousand" effect. This method can generally reduce the egg weight of cotton bollworm in the wheat field by 50%, and reduce the population of the first generation of bollworm by 31%~43%, and reduce the second generation of cotton bollworm eggs by 30%. The techniques of moth-eating moths in wheat fields: During the emergence of the first generation of cotton bollworms, from the older poplars, the 2-year-old branches were selected to be wilted and then bundled with 10-15 leaf-bearing branches. From the base, the branches are kept tight and the branches are kept loose. The branches are about 100 centimeters long. In the evening, the wheat field is inserted so that the branch height is about 10 centimeters higher than that of the wheat plants. Put the sticks in a plastic bag or a nylon bag every morning, and then beat them so that the bollworm drops into the bag and kills it. After the plug, during the emergence of the bollworm, it is necessary to insist on catching it every morning and the branches should be replaced every 7 days. This method is suitable for large-scale use, the greater the use of the area is, the better the effect is, and it is very suitable for the current application of the unified defense. For a household, the effect of using a small area is poor and should not be used. If Yang Shuzhi inserts, does not insist on capturing every day, but will get the opposite result.
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