Tomato sunburn disease mostly occurs in the open field cultivation and planting density is relatively sparse in the field, by direct light irradiation, the fruit on the sunny side of the large chlorotic white lesions, and the surrounding healthy organization is more obvious boundaries, the lesions later dry , leathery, thin, tissue necrosis.
First, the harm symptoms: mainly occurs in the fruit, especially the fruit shoulder prone to sunburn, the disease is shiny, like transparent leathery, after the change of white or yellow brown spots, sometimes wrinkles, shrinkage becomes hard after the sunken The flesh turns 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.
Second, control methods:
1. Pay attention to reasonable dense planting, timely and moderate pruning, so that the stems and leaves cover each other and the fruits are not exposed to direct sunlight.
2, choose lush foliage varieties.
3, timely watering, reduce plant temperature, can avoid sunburn.
4, increase organic fertilizer, improve soil water retention performance. Timely pruning in time, promote plant growth, lush foliage, reduce the direct sun to the fruit.
5, high temperature season fruit surface spray 27% high-fat film emulsion 80-100 times liquid, improve plant heat resistance.
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