Gradually into the spring, as the temperature rises, tomato bacterial wilt, blight and root knot nematode disease gradually increase. The symptoms of these three diseases are not easy to distinguish on the surface. The author will introduce the differences and solutions of these three symptoms in detail to help the farmers to control the disease.
Bacterial wilt: From the outside, the most important feature of tomato bacterial wilt is that the plants are wilting. Tomatoes with wilting symptoms, if you cut the base of its stem, you can clearly see that the color of the vascular bundle has turned brown. If it is not treated in time, it will appear dead after several times of repeated wilting. The best way to prevent and cure tomato bacterial wilt is to use roots such as DT plus neomycin or agricultural streptomycin to add rooting agent. When the root is applied with a chemical, the above-mentioned agent can be used for protective spraying on tomatoes that are not affected. Bacterial wilt can be spread by running water, and flooding can cause the bacterial wilt to spread rapidly. Therefore, it is strictly forbidden to flood the greenhouse in the greenhouse where the symptoms of dead trees occur. At the same time, proper spraying of some plant growth conditioners or foliar fertilizers can effectively promote the recovery of tomato plants, such as Harvest No. 1, Yunda 120 , and love more. In fertilization, pay attention to less nitrogen fertilizer, apply organic fertilizer and phosphorus and potassium fertilizer to enhance the disease resistance of the plant.
Fusarium: It begins to manifest itself after colonization. In the early stage of the disease, the leaves that are generally closer to the ground are yellow, and finally brown and dead, and the dead leaves remain on the stems; the leaves on one side of the stem are yellow, and the leaves on the other side are normal; there are also leaves on individual branches. The yellow side is yellow and the other half is normal. When the disease is serious, the diseased leaves expand from the bottom to the top, and only a few leaves at the top remain, and the rest are dead. The main symptom of the disease is that the leaves of the plant are yellow after the disease, and the pink mold is often found at the base of the stem when wet. Control method: rotate with vegetables with spicy taste for 3~4 years, such as green onion, garlic, etc.; use disease-free seeds, or soak seeds with 52 °C warm water for 30 minutes before sowing, or mix with carbendazim, disease-free soil Nursery. Strengthening matter shed management, results increasing the ventilation rate, reduce soil temperature; the early stages with 50% benomyl IRRIGATING 1000 times, 200 ml per plant irrigation, irrigation every 7 to 10 days 1, 2 or 3 times and even irrigation .
Root knot nematode disease: mainly occurs in the fibrous roots and lateral roots of tomatoes. The incision roots contain small milky white nematodes hidden in them. The new roots produced on the root knots will re-infect and form root-like tumors. Plant morphology is short, stunted, and even premature aging. Control methods: First, strengthen field management. During the growth of tomatoes, field management should be strengthened, and reasonable fertilizer and water measures can enhance the disease resistance of tomatoes. When the root-knot nematode occurs, the diseased body should be thoroughly treated and burned or buried deeply. The vegetables in the middle growth stage can be better treated with avermectin plus harvest No. 1, Jianzhibao fertilizer and Awei organic fertilizer. The second is chemical control. At the time of sowing or planting, the point of Zhijianzhi medicine fertilizer, Awei organic fertilizer, etc., can control the root knot nematode damage. In addition, in the greenhouse leisure season, the use of lime nitrogen high temperature shacks or the use of bromine and other strict sterilization.
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