Greenhouse Vegetable Leaf Mould Control

February 10, 2020

Cucumber and Tomato leaf mold are commonly called black disease, and the disease is most harmful to greenhouse cucumbers and tomatoes. The northeast, north, central and southeast regions often occur. In recent years, the cultivated area of ​​cucumbers and tomatoes in the solar greenhouse in Shaanxi has soared, and the phenomenon of continuous cropping has become widespread, leading to an increase in cucumber and tomato leaf mold disease. In the spring of 2008, the incidence and prevalence of tomato and cucumber leaf mold in greenhouses in the Guanzhong area of ​​Shaanxi Province had a great impact on tomato and cucumber. Generally, the output of field plots was reduced by about 10%, and that of severe plots was reduced by 40%. Therefore, the prevention and treatment of the disease must be given great attention.

According to the incidence characteristics and conditions of cucumber and tomato leaf mold disease, prevention should be based on early prevention and comprehensive prevention and control should be implemented. Actively adopt preventive measures, implement scientific management, make full use of the controllability of greenhouse facilities, and create an environment and conditions that are conducive to the growth of cucumbers and tomatoes, and that are unfavorable to the birth of pathogens, so as to control the occurrence and epidemic of the disease.

Selection of disease-resistant varieties of cucumber and tomato varieties showed significant differences in resistance to leaf mold. According to the author's spring survey in 2008, cucumber varieties such as the Jinbian system, including Jinchun No. 4 and Jinyuan No. 3, were precocious and hybrid. They were resistant to low temperatures and weak light, yielded high yields, and were of high quality and disease resistance. Good performance. Tomato is best to use Hybrid No.9, powder Jiabao Golden shed to crown, especially Zhongza No. 9 special against leaf mold. Remind growers to pay attention to this when selecting varieties. At the same time, it is also necessary to select varieties of leaf mold resistant to local conditions in order to reduce the disease.

Spraying dust on rainy days for prevention and control Spray 5% chlorothalonil dust or 7% foliar dust agent in the evening, 1000ml per acre, once every 7-8 days; 5% chlorothalonil can also be applied. 500 grams of aerosol was smoked and prevented from being released in the evening, and the greenhouse was closed for smoking overnight when it was released. The dust agent and the aerosol agent are preferably sprayed and controlled alternately with the water agent so as to improve the control effect.

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