Pathogen Pseudomonas cichorii, P. marginalis, P. viridiflava
Symptoms are also known as lettuce pseudocyst rot or bacterial leaf spot, which is a bacterial disease. Plants in the pre-ballooning stage are susceptible to disease. First, the leaf margins are immersed in water, gradually changing from pale brown to dark green, and some of the mesophyll tissues are dead and the leaves are shriveled. During the ball stage, light brown immersed lesions appeared in the middle leaves or leaf margins of the outer leaves, and soon after the veins became brown and rapidly expanded, but no mold layer. The inner leaves browned and softly rotted, and the surface of the leaf ball was covered with thin paper-like browning and dead leaves.
The pathogenic bacteria attached to the residue of diseased plants overwintered and survived in the soil for more than one year and was transmitted through the soil. Rainwater, irrigation water and pests spread in the field, and the temperature is 25-27°C. The cold season and the continuous rainy weather are prone to disease. When the harvest is delayed, the disease rapidly increases. In addition, continuous cropping can promote disease occurrence. Therefore, it is necessary to avoid the continuous cropping of plots in the previous year.
Control methods
1 The agricultural measures found that the diseased plants were immediately removed and burned, sorghum cultivation was carried out, field drainage was strengthened, and harvesting was timely.
2 In the early stage of disease prevention and treatment, 47% Garenon WP is used 700 times, or 78% MnZn WP 500 times, or 40% CK WP 600 times, or 14% urinary copper Aqueous agent 350 times, or 50% of irrigated soluble powder 1200 times, or 60% of copper sulphide, aluminum zinc, wettable powder 500 times, or 72% of agricultural streptomycin sulfate powder 3000 times, or 53.8% Can kill dry suspension agent 1000 times and other agents spray control. Spray once every 7 days, continuous control 2 to 3 times.
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