Leaf mold is a common disease of tomatoes. The disease does not infect fruits and it mainly infects tomato leaves. In the initial stage, some greenish spots appeared on the back of the leaves, and gray or black-purple irregular moldy layers were formed on the later stages of the disease. The people were commonly called “black defectsâ€. The leaves turned green and yellow in the corresponding parts. In severe cases, the leaves often Dry shrinkage occurs.
Incidence of disease: leaf mold usually spread upward from the lower leaves of the plant, generally greenhouse temperature is 20 ~ 25 °C, relative humidity of about 85% when susceptible to disease. In the environment with weak sunshine, poor ventilation and excessive humidity, leaf mold is particularly serious. The disease seriously affects the physiological functions of the leaves and can lead to a significant reduction in the yield of tomatoes.
Control methods: Tomato leaf mold is very easy to outbreak, once the disease is difficult to control. And as the number of medications increases, their drug resistance will gradually increase. During spraying, the spores on the lesions are also scattered to allow them to diffuse into the air, and they are re-infected with the airflow and transferred to other leaves. Therefore, the prevention and treatment of leaf mold must be early. Note that 45% of the chlorothalonil-containing smoke agent is used for indoor disinfection before the seedlings are implanted. In the early stage of the disease, the drug can be controlled in a timely manner. Dust method or smoke agent can be used. 5% Garethon, chlorothalonil dust, and 45% chlorothalonil can be used. Agent. The spraying method should be applied in the morning, pay attention to the leaves carrying drugs. Can be used 10% Shigao water dispersed granules 1000 times, 2% Wuyimycin aqueous solution 150 times, 60% anti-mildew treasure ultrafine powder 600 times, 47% Garnett WP 600 to 800 times etc. , Note 7 to 8 days spray once, alternating medication to prevent resistance.
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