In winter and spring, the temperature gradually increased, and tomato root-knot nematode disease, wilt disease, and bacterial wilt gradually increased in greenhouses. All these three diseases can cause the wilting of the damaged tomato plants, and the symptoms are not easy to distinguish on the surface. Yang Zhongan, a professor at the Agricultural Science Academy of Northwest Agriculture and Forestry University, has helped the majority of farmers solve the problem and distinguish several diseases.
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Blight
Symptoms: Most of the blight symptoms begin after colonization. At the early stage of disease, the leaves that are generally closer to the ground yellow and eventually become brown and dead. The dead leaves remain on the stem and do not fall off. When the disease is severe, the diseased leaves expand upward from the bottom, leaving only the top few leaves, and the rest are Withered. The incidence of light, only leaves close to the ground outside the yellow leaves, the rest are normal, flowering, no difference between the results and healthy plants. The main symptom of this disease is different from the bacterial wilt disease. The leaves of the plant are yellow after the disease is caused. When the disease is wet, the pink moldy material is often produced at the stem base.
Prevention methods: Rotate with pungent vegetables for 3-4 years, such as scallions, garlic, etc.; select disease-free seeds, or sterilize seeds by soaking in warm water at 52°C for 30 minutes before sowing, or dressing with 50% carbendazim; Disease soil seedlings; strengthen the management of greenhouses, the results increase ventilation, reduce soil temperature; early onset of 50% carbendazim 1000 times Irrigation roots, irrigation once every 7-10 days, with irrigation 2-3 times.
Bacterial wilt
Symptoms: From an external point of view, the most important feature of tomato bacterial wilt is the wilting of plants. In the case of tomato with wilting symptoms, if the stem base is opened, it can be clearly seen that the vascular bundle has become brown in color. If tomato green wilt is not treated in time, it will die after repeated wilting several times.
Control methods: To control tomato bacterial wilt, a better way is to use the agent to irrigate the roots, such as using DT plus neemectin or agricultural streptomycin plus rooting agent. In the case of rooting with a drug, the above-mentioned agent can be used for protective spraying on tomatoes that are not affected. Tomato plants that have died of the disease cannot be disposed of in a greenhouse. They should be buried deep outside the greenhouse and disinfected at the same time. Bacterial wilt can be transmitted through running water. Flooding and flooding can quickly spread and spread bacterial wilt. Therefore, greenhouses with symptoms of dead trees must not be flooded. At the same time, proper spraying of some plant growth regulators or foliar fertilizers can effectively promote the recovery of tomato plants.
Root-knot nematode disease
Symptoms: Root-knot nematode disease mainly occurs on the fibrous roots and lateral roots of tomato. There is a small milky nematode in the root knot. The new roots will re-infect the disease and form root-knot neoplasms. The plant morphology is short, stunted, and even prematurely withered.
Control methods: During the growth of tomato, field management should be strengthened, and reasonable fertilizer and water measures can enhance tomato disease resistance. When the root-knot nematode occurs, the sick body should be thoroughly treated and burned or buried deeply. Secondly, when sowing or planting, acupuncture points Jianjian medicinal fertilizer, Avi organic fertilizer, etc., can control root knot nematode damage. In addition, it can also be used in the greenhouse leisure season, the use of lime nitrogen high-temperature stuffy shed or selected Bromide Thai strict disinfection.
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