Reasons for aggravation 1. Failure to make a reasonable rotation. In recent years, under the stimulation of the melon economy, the area of ​​watermelon and melon cultivation in your county has increased to more than 20,000 mu. In order to facilitate the production and marketing, the cultivation area has become a base and scale development, resulting in “watermelon†and “melon villageâ€. In recent years, the area of ​​cultivated white melon seeds has also increased, forming a situation in which watermelons, melons, and white melon seeds have developed. According to statistics, your county grows about 800,000 mu of various crops, of which rice, corn and soybeans each account for more than 200,000 mu, and the former crops suitable for growing melons are wheat, sorghum, millet and other grasses. The cultivated area of ​​crops is smaller than that of watermelon and melon, and it cannot be rotated reasonably. Specific to the villagers or farmers who grow watermelons and melons, because the land area is small, the crops are single, the melons are planted in successive years, and the grounds cannot be opened. It is difficult to meet the requirements of normal five-year rotation, and the amount of bacteria that damage the melons in the soil is increasing year by year. Accumulation, increase or decrease, resulting in increasing pests and diseases.
2. The climatic conditions are suitable for the occurrence of pests and diseases. Your county is located in the southeastern part of the province, on the banks of the Muling River. It belongs to the second accumulated temperature zone. The annual rainfall is about 500 mm. The rainy days are mostly distributed in July-August. The showers are often hot and humid, and the climate is warm and humid. The adjustment is summer, the climate is humid, and the dry index is 0.9. This climate is very suitable for the occurrence of various diseases and insect pests such as melon anthracnose, downy mildew, blight, and melon.
3. The prevention and control work has not kept up. There are many kinds of pests and diseases of watermelon and melon, which occur all the year round. It is required that the melons should seriously implement the “prevention-based, comprehensive prevention and control†plant protection policy, based on prevention and careful prevention. Some farmers have low levels of prevention and control, neglect prevention, and often are seriously ill, not only can not control the development of the disease, but also cause many diseases transmitted by airflow, such as downy mildew, anthracnose, powdery mildew, etc. to be introduced into nearby melon fields. The formation of a family of melons, multi-family suffering, resulting in the expansion of the ward, spread to disaster. For the blight of the roots of the melons, it must be based on prevention. The bacteria can survive in the soil for 7 years, the rotation period is not enough, and the application of the seedlings is not carried out when planting or planting the seedlings. If you don’t do well, it will often cause devastating disasters. In the prevention and control organization, the unified defense rule has not been carried out very well, resulting in the failure of prevention and treatment, the prevention and treatment methods are not advanced, the varieties of drugs are not right, and the control effect is not high, the cost of prevention and control increases, and the economic benefits are affected.
4. Field hygiene is not thorough. After harvesting the fruits in autumn every year, the residual plants, dead leaves, rotten melons, etc. left over from the melon fields were not completely removed and destroyed. Some are left in the field, abandoned, and some are simply removed, abandoned to the ground, not completely destroyed, retaining a large number of bacteria, leaving hidden dangers for the next year.
2. The climatic conditions are suitable for the occurrence of pests and diseases. Your county is located in the southeastern part of the province, on the banks of the Muling River. It belongs to the second accumulated temperature zone. The annual rainfall is about 500 mm. The rainy days are mostly distributed in July-August. The showers are often hot and humid, and the climate is warm and humid. The adjustment is summer, the climate is humid, and the dry index is 0.9. This climate is very suitable for the occurrence of various diseases and insect pests such as melon anthracnose, downy mildew, blight, and melon.
3. The prevention and control work has not kept up. There are many kinds of pests and diseases of watermelon and melon, which occur all the year round. It is required that the melons should seriously implement the “prevention-based, comprehensive prevention and control†plant protection policy, based on prevention and careful prevention. Some farmers have low levels of prevention and control, neglect prevention, and often are seriously ill, not only can not control the development of the disease, but also cause many diseases transmitted by airflow, such as downy mildew, anthracnose, powdery mildew, etc. to be introduced into nearby melon fields. The formation of a family of melons, multi-family suffering, resulting in the expansion of the ward, spread to disaster. For the blight of the roots of the melons, it must be based on prevention. The bacteria can survive in the soil for 7 years, the rotation period is not enough, and the application of the seedlings is not carried out when planting or planting the seedlings. If you don’t do well, it will often cause devastating disasters. In the prevention and control organization, the unified defense rule has not been carried out very well, resulting in the failure of prevention and treatment, the prevention and treatment methods are not advanced, the varieties of drugs are not right, and the control effect is not high, the cost of prevention and control increases, and the economic benefits are affected.
4. Field hygiene is not thorough. After harvesting the fruits in autumn every year, the residual plants, dead leaves, rotten melons, etc. left over from the melon fields were not completely removed and destroyed. Some are left in the field, abandoned, and some are simply removed, abandoned to the ground, not completely destroyed, retaining a large number of bacteria, leaving hidden dangers for the next year.
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