Tomato stem rot control technology

The tomato in summer is now in the flowering and fruit setting period. The physiology of the plant and the high temperature of this period determine the pathogenesis of tomato stem rot. This disease is introduced as follows for reference:
The disease is caused by the fungus Rhizoctonia solani. The pathogenic bacteria are mycelium and sclerotium that live in the soil for winter, and have strong saprophytic properties. They can survive in the soil for 2-3 years, leading to large tomato seedlings or the onset of initial plant growth. The germ development is suitable for temperature 24°C and the highest is 40-42°C.
First, the symptoms of identification of seedlings planted too deep or stem base waterlogging, soil too high and prone to this disease, the disease mainly damage the seedlings or colonization of tomato stem base or underground main lateral root, lesions were dark brown, around the stem base or As the rhizomes expand, the cortex rots and the leaves on the ground turn yellow. After the fruits are swollen, they are gradually wilted and die due to the supply of nutrients. In the later stages of the disease, sclerotia of different sizes are often formed on dark brown surfaces.
Second, prevention and control measures
(I) Agricultural control 1. Select disease-resistant varieties.
2. Strengthen cultivation management. Planting should pay attention to remove diseased seedlings, seedlings should not be too deep when planting, rainy days to rule out the accumulation of water on the ground, soil should not be too high, in order to reduce the incidence of planting fields. 3. Strengthen field management. Planting sites were selected for planting with non-solanum crops for more than three years. After the onset of colonization, the soil can be applied to the base of the stem. Apply 40% of the double-seeded double-side wettable powder (9 g) per square meter of topsoil. Mix well and then cover the soil at the base of the diseased plant. Then bury the diseased part and grow it above the lesion. Adventitious roots can extend life expectancy and gain output.
(2) Chemical control Spray 40% of the double powder suspension 800 times, or use 20% methyl-precipitate EC 1200 times, to spray the stem base of the plant. Can also be applied to the Ministry of the Ministry of five chlorine nitrobenzene powder 200 times plus 50% of the United States WP 200 times, the effect is good.

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