In the autumn and winter, alfalfa insect pests are most easily overlooked. If we can do a good job of pest control during this period, it will be of great significance to kill overwintering pests and diseases and reduce the pests and diseases of the next growing season. Specific prevention measures are as follows: 1, after the fall Many pests and pathogens overwinter on the alfalfa's surface debris, and in autumn, winter, and early spring, they will eliminate the large number of pests and pathogens and reduce the source of infestation in the early next year. 2, grazing Targeted grazing will be carried out. The animals will eat a large number of stubble and weeds, and will eat, destroy, and carry pests and germs. However, there are some kinds of insect pest eggs and germs that can continue to survive in the intestines and stomachs of livestock. As the faeces remain in the fields, they become the primary source of infestation of pests and diseases the following year. 3, Incineration Incineration of pests on the remains is almost 100%, and it is economical. However, attention should be paid to fire prevention and it is not applicable in many cases. 4. Irrigation Irrigation can worsen the living conditions of pests and diseases, and suppress or kill pests and protozoa, especially for winter irrigation. At the same time, irrigation in winter is beneficial to wintering and returning green in the following year. 5. Pesticide control There is a long period of time after the harvest from autumn to the next year. Using pesticides during this period can effectively kill all kinds of diseases and insect pests, and it can also minimize the amount of pesticide residues in the products of alfalfa the following year. It is a Better pesticide life, but need to pay attention to the effect of low temperature on efficacy and the role of pesticides on beneficial organisms.
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