Greenhouse planting of cherry tomatoes often suffers from leaf mold attack, vegetable farmers should pay attention to prevention and treatment.
First, the symptoms
The main damage to the leaves, but also seriously harm the stems, flowers and fruits. The leaves were infected. The leaves had irregular or oval-yellow chlorotic spots. The first layer of white mold was found in the upper part of the leaves, and the later layer turned grayish brown or dark brown. When the conditions are appropriate, black mold can also grow on the front of the lesion. As the disease progresses, the leaves gradually curl from the bottom to the top, and the plants are yellow-brown and dry. The fruit is infected, and black round or irregular shaped patches are formed near the fruit pedicle or on the fruit surface, and the depression is hardened and cannot be eaten. The stems or stalks are infected and the symptoms are similar to the leaves.
Second, control methods
1. Rational rotation. Heavy areas should be implemented for more than 3 years to reduce the initial infestation.
2. Soaking. The disease-resistant varieties were selected. Seeds before sowing were soaked in warm water at 53°C for 30 minutes and allowed to air dry for sowing.
3. Strengthen management and protection. Strengthen the management of temperature and humidity in the shed, timely ventilation, proper control of watering, timely dehumidification after watering, in order to form the conditions of temperature and humidity for the occurrence of unfavorable bacteria, properly dense planting, timely pruning and pruning; formula fertilization to avoid excessive nitrogen fertilizer, improve Plant resistance to disease.
4. Pharmacy fumigation. Before flocking, use sulphur powder to fumigate greenhouses or greenhouses. For every 55 cubic meters of space, 0.13 kg of sulphur and 0.25 kg of sawdust are mixed and ignited. The shed is sealed and smoked for 24 hours before planting. At the beginning of the disease, 45% of the chlorothalonil smoke agent can be used for 250 grams per acre per room and smoked overnight.
5. Qiao powder. In the evening, spray 7% folic acid net dust or 5% Garrin powder or 6.5% trimethoprim ultrafine dust agent, each kilograms per acre, once every 8 to 10 days, alternating medication.
6. Spray the medicament. Can be sprayed with Wuyimycin agent 100-150 times solution or 47% Garethon WP 700-800 times solution or 50% Polymyxin WP 800 times solution or 40% chlorphenirdone WP in the early stage of disease. 400 times liquid, spraying 50-65 liters per acre. Spray once every 7-10 days, spray 2 or 3 times.
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