Leaf mold is a kind of high temperature and high humidity disease. Its disease condition is: temperature 20 ° C -25 ° C, relative humidity above 90% is easy to occur and prevalence. In the case of poorly ventilated plants and poor watering conditions, it is easy to spread, and the cultivation conditions of autumn tomatoes are high temperature and rainy seasons. In order to control the occurrence and prevalence of leaf mold, it is said that the cultivation and management of the autumn tomato are mainly based on the investigation and prevention of the leaf mold of autumn tomato for three consecutive years. Comprehensive prevention and control technology.
The selection of resistant varieties and the cultivation of disease-free and strong seedlings are currently more resistant to No. 7, No. 8, No. 9, Jiafen 15, Double Resistant No. 7, and No. 802. Before sowing, use 52 ° C - 55 ° C warm water, soak seeds for 20-30 minutes, about 35 ° C high temperature and high humidity germination.
The seedbed is selected from disease-free loam, and the seedlings should be fully sifted and screened to remove various crop residues. Disinfect the seedbed and greenhouse with carbendazim or carbendazim and metalaxyl dust before sowing. The nursery site should be chosen away from the solanaceous crops, high ground, well ventilated and shaded equipment. Seeding is carried out by seedling raising seedlings, and 2-3 seeds are spotted at each hole, then the farmer's fertilizer is used as the base fertilizer, and the weak seedlings are removed. When 2-3 leaves are single-hearted, play chlormequat, once every 7-10 days, the seedling age is limited to 20-25 days, and the third time should be carried out after planting the seedlings.
Sowing and planting at the right time: Sowing in North China should be in the beginning of July-July, planted at the end of July or early August, and harvested at the end of October. The planting shed should apply the fermented farmyard manure and increase the application of phosphorus and potassium fertilizer. It is best to plant the plant with the cable in the evening, and the roof should cover the film.
Field management and chemical control: After slow seedlings, timely cultivating loose soil, strengthen temperature and humidity management, pay attention to cooling and ventilation, and minimize the number of watering. Mid-September is the middle and late stage of tomato growth. It is beneficial to the occurrence and prevalence of leaf mold from both climatic conditions and the growth period of tomato. Therefore, in the end of August-September, you should play Wanmuling or Garrinong. Prevention and control once; if the field leaf mold has occurred, after the disease is initiated, it should be continually beaten 2-3 times in a timely manner, every 7-10 days. After 3 years of experiments, it is possible to effectively control the pesticides that are good for controlling leaf mold by 65% ​​carbendazim WP and 65% carbendazim 47% of Garrinone WP 800 times. The development of disease.
The selection of resistant varieties and the cultivation of disease-free and strong seedlings are currently more resistant to No. 7, No. 8, No. 9, Jiafen 15, Double Resistant No. 7, and No. 802. Before sowing, use 52 ° C - 55 ° C warm water, soak seeds for 20-30 minutes, about 35 ° C high temperature and high humidity germination.
The seedbed is selected from disease-free loam, and the seedlings should be fully sifted and screened to remove various crop residues. Disinfect the seedbed and greenhouse with carbendazim or carbendazim and metalaxyl dust before sowing. The nursery site should be chosen away from the solanaceous crops, high ground, well ventilated and shaded equipment. Seeding is carried out by seedling raising seedlings, and 2-3 seeds are spotted at each hole, then the farmer's fertilizer is used as the base fertilizer, and the weak seedlings are removed. When 2-3 leaves are single-hearted, play chlormequat, once every 7-10 days, the seedling age is limited to 20-25 days, and the third time should be carried out after planting the seedlings.
Sowing and planting at the right time: Sowing in North China should be in the beginning of July-July, planted at the end of July or early August, and harvested at the end of October. The planting shed should apply the fermented farmyard manure and increase the application of phosphorus and potassium fertilizer. It is best to plant the plant with the cable in the evening, and the roof should cover the film.
Field management and chemical control: After slow seedlings, timely cultivating loose soil, strengthen temperature and humidity management, pay attention to cooling and ventilation, and minimize the number of watering. Mid-September is the middle and late stage of tomato growth. It is beneficial to the occurrence and prevalence of leaf mold from both climatic conditions and the growth period of tomato. Therefore, in the end of August-September, you should play Wanmuling or Garrinong. Prevention and control once; if the field leaf mold has occurred, after the disease is initiated, it should be continually beaten 2-3 times in a timely manner, every 7-10 days. After 3 years of experiments, it is possible to effectively control the pesticides that are good for controlling leaf mold by 65% ​​carbendazim WP and 65% carbendazim 47% of Garrinone WP 800 times. The development of disease.
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