Tomato Disease Prevention Methods

Disease symptoms. In the growing season, it will often appear that most of the first fruit branches will develop first, and sometimes the entire plant will suddenly develop disease. The leaves will be curled, shrunk, and tube-shaped and become brittle, which will cause the fruit to be directly exposed to sunlight and affect fruit enlargement. Etiology: In greenhouse cultivation, physiological curling phenomenon occurs easily in the middle and late growth stages. Especially at the vents, curling tends to be heavier. It is mainly due to high temperature and dry weather, which cannot be compensated in time, and the transpiration of the leaves is enhanced as a self-regulation. Closed the air hole, causing the leaves to curl up.

The law of onset. Mainly related to soil, irrigation and management. When the temperature is high or there is a lack of water in the field, the tomato closes the stomata, causing the leaves to fold up or curl up and appear as physiological leaf curls.

Prevention methods. 1. Perform drought training after planting. 2. Apply the formula fertilization method to ensure timely and appropriate amount of fertilizer, ensuring sufficient moisture on the soil. 3. Use shade nets to cover cultivation. 4. Do a good job of pruning in time. 5. Select resistant varieties, such as early morning, etc., and Beijing 10, early kuei leaf weight. 6. Proper use of plant hormones. 7. Control locusts in time.

Day burn disease

Injury symptoms. Mainly occurs in the fruit, especially the fruit shoulder is prone to sunburn, the disease is shiny, like transparent leathery, after the change of white or yellow brown spots, sometimes wrinkles, shrinking and hardening after the depression, the pulp turned brown. When the surface of the diseased area is infested with germs, grow black mold or rot. When the leaves are sunburned, the chlorophylls fade, and some of the leaves become bleached, and finally they turn yellow and die, or the leaf margins are dry and coke.

The characteristics of the disease. The fruit is swollen, the weather is dry, the soil is dry, the fruit is exposed to strong light, the temperature of the peel increases, evaporation consumes much water, and the fruit surface is overheated and burns. It usually occurs on the sunny side of the fruit.

Prevention methods. 1. Choose lush foliage.

2. Watering in time to reduce the temperature of the plants can avoid sunburn.

3. Increase organic fertilizer and improve soil water retention. Timely pruning in time, promote plant growth, lush foliage, reduce the direct sun to the fruit.

4. High-temperature season fruit surface spray 0.5% copper sulfate or zinc sulfate, or 27% high-fat film emulsion 80-100 times liquid, improve plant heat resistance.

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