Lettuce rot disease prevention

Lettuce rot is a kind of bacterial disease. The disease begins with the edge of the leaf. The diseased leaf is immersed in water and gradually changes from pale brown to dark green. Some leaf tissues die and the leaves shrink. During the ball stage, the outer leaf veins or leaf margins appear light brown water-soaked lesions, and then the veins quickly brown and soft rot, forming a thin paper-like browning dead leaves on the surface of the leaf bulb.

The disease is spread by rainwater, irrigation water and pests. It is easy to attack in the cold season and even rainy days. Diseases increase rapidly when the harvest is delayed, and it is easy to grow disease in successive years.

Control methods: 1. Agricultural measures. The implementation of high ridge cultivation, strengthen the drainage of the field, reduce the humidity in the field, at the same time to harvest. Carry out the rotation. Timely control of pests and eradication of the media.

2. Chemical control: At the beginning of the disease, use 47% Garethon WP 700 times, or 40% bacteriocin WP 600 times, or 14% urinary ammonia Glue 350 times, or 60% ceric chloride B-Al-Zn wettable powder 500 times, or 72% agricultural streptomycin soluble powder 3000 times, or 53.8% can kill dry suspension 1000 times spray control. Spray once every 7 days, continuous control 2-3 times. Pay attention to alternate medication when spraying to avoid drug resistance.

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