Recently, when interviewed by reporters in rural areas, it was found that the phenomenon of tomato rotten heads was more common and the symptoms were different.

In an interview with the master peasant Liu Master of the Guancun Village in Datian Township, Shouguang City, it was discovered that some tomato plants began to darken from the edge of the tomato heart leaf and gradually expanded inwards. In severe cases, the diseased leaves were dark brown and dry and the faucets died. Master Liu introduced that the “bad head” of tomatoes appeared after the start of rainy weather in late August.

In the shed of the vegetable farmer Yang Chengbin of Gucheng Street, Shouguang City, the reporter observed that the upper leaves of the tomatoes also appeared black, which also began to appear from the edges of the leaves. However, unlike Liu’s shed, the tip and leaf margins were different. In the early stage of the disease, dark green water was immersed. When the humidity was high, white mold was produced at the junction of the healthy parts of the leaves, and dark brown was corrupted when severe.

In the canopy of vegetable farmer Wu Dao, Daotian Town, Shouguang City, the situation the reporter saw was different from the above two diseases. The red tomatoes planted by Master Wu had already reached the 4th fruit, and some of the plants appeared yellow on the edge of the heart, and then Gradually expanding inwards, the leaves are brownish and dry when they are severe. The obvious difference from the above two diseases is that the diseased leaves are light in color and do not turn black. The reporter also found that some tomato plants have serious umbilical rot.

Due to the continuous rainy weather in the previous period, the weak growth of the plants, the high humidity in the greenhouse, the infestation of the plants by the bacteria, and the impediment to the absorption of nutrients were the main reasons for the recent high incidence of tomato rotting. Let's first introduce these three diseases to vegetable farmers.

The first is mainly the "rotten head" caused by bacterial diseases. The symptoms of the disease were very similar to those of tomato late blight, and the reporter did a simple training after retrieving the diseased plant samples. It was found that the disease rotted faster and no mildew or hair appeared. Judging by its onset symptoms and culture results, this should be a bacterial disease. The reporter suggested that even when the cloudy days, growers can use 1500 times the streptomycin for agricultural prevention; for the diseased plants, you can use 20% of endotoxin 500 times mixed with 20% of the konjac (thiacax) 600 times Spraying, the effect is good, usually once every 4-5 days, continuous 2-3 times.

Master Yang's shed situation is caused by tomato late blight caused by the "rotten head", vegetable farmers can use Amisite 1500 times mixed 25% metalaxyl. Cream Urea 500 times spray control, 3-5 days spray Once, 2-3 times in a row.

In the last case, the reporter believes that this is caused by calcium deficiency. The main causes of calcium deficiency in plants are the following three: First, due to the application of high-nitrogen and high-phosphorus fertilizers, the calcium in the soil is fixed, causing difficulties in absorption. Followed by the soil viscosity or high salinity caused by the absorption of calcium is difficult; and then even the cloudy plant organic nutrient deficiency, weak root activity, leading to calcium absorption was blocked, the problem of calcium deficiency. According to different situations, calcium scavenging can be performed by flushing calcium nitrate with foliar spraying.

It is extremely difficult to prevent disease even in cloudy days. Therefore, vegetable growers must first take preventive measures to improve the plant's resistance to various diseases.

For a long period of cloudy days, the photosynthesis of the plants is very weak. Attention should be paid to the temperature control in the shed to reduce respiratory consumption. The daytime temperature can be controlled at 20-28°C and the night temperature can be about 12-15°C. When it is clear, pay attention to short-term shading, ensure a smooth transition of the lighting in the shed, and do not raise the temperature of the shed quickly as soon as it is clear. Otherwise, it will cause wilting and increase plant damage.

Lack of nutrients in the cloudy days, and the synthesis of chlorophyll and various enzymes are affected. Attention should be paid to spraying full-foliage foliar fertilizer, glucose, amino acids, chitin, etc. to supplement nutrients, promote the synthesis of chlorophyll, and enhance the photosynthetic efficiency of the plants. To promote plant growth.

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