What medicine does tomato black stem disease use?

Tomato black stem disease is generally caused by early blight, late blight, stem rot and other diseases.

Generally, spraying 1000 times of 50% nongliling wettable powder can prevent early blight, and spraying 800 times of 72.2% Prick aqueous solution or 500-600 times of 72% Kelv wettable powder can prevent late blight.

Stem rot can be sprayed with chlorothalonil (100- 150 times solution) and garlic oil (1000- 1500 times solution) on the stem base and surface of plants. If the disease is serious, other fungicides can be compounded.

When planting tomatoes, plant them closely and trim the plants in time. It is best to plant about 3000 tomatoes per mu. When pruning tomatoes, choose the method of single stem pruning, leaving only the trunk and removing the remaining side branches.

When applying fertilizer, the amount of organic fertilizer can be increased, supplemented by phosphorus and potassium fertilizer. The application of organic fertilizer can increase the content of organic matter in soil and increase the permeability of soil.

Matters needing attention in tomato planting

Tomatoes like sunshine, and the intensity of light is directly related to the yield and quality of tomatoes, so it is necessary to maintain good lighting conditions in cultivation. The light saturation point of tomato is 70000 lux. Generally, it is necessary to ensure the light intensity above 35,000 lux. As far as the illumination time is concerned, there are 65,438+065,438+0-65,438+03 hours of illumination every day, and the plants grow best and can grow and bear fruit normally in a short time.

Tomato is a warm vegetable, generally speaking, it can adapt to the growth of tomato in the temperature range of 15~35℃. The optimum temperature of seedling stage is 20 ~ 25℃ in the daytime and 10 ~ 15℃ at night.

Flowering period is sensitive to temperature, and the optimum temperature is 20 ~ 30℃ during the day and 15 ~ 20℃ at night. The optimum temperature of fruiting period is 24~26℃ in the daytime and 12~ 17℃ at night. The optimum temperature of fruit coloring period is 20~25℃, and coloring is not good above 30℃.