Tomatoes are the most popular type of vegetables and have a large amount of sales in the market. However, it is well known that tomatoes are the most susceptible to diseases in the growing process. Little attention from growers causes a serious decline in yield, although Now is the season when the winter is not the growth of tomatoes, but greenhouses as a counter-season vegetable, the chance of disease is even greater. Today, the first series of pesticides for China introduced one of the diseases that tomato leaves yellow and white:
First, the symptoms
Generally occurs in the middle of the growth of tomato plants. Before and after flowering, the lower leaves grow normally and the middle and upper leaves turn yellowish-white. It is not a simple growth point. The leaves turn yellow, the leaves are thin, some brown veins die in the middle of the veins, and the fruit peels. As it is powerful, the plants grow thin and the yield is affected.
Second, the cause analysis
Many vegetable farmers believe that iron deficiency and zinc are responsible. After supplementing iron and zinc foliar fertilizers, the effect is poor. In fact, the root cause of this situation is not the lack of nutrients. Instead, the plant stems are browned or hollow inside, and the bacteria are the marrow. Caused by necrosis rather than leaf disease or lack of ingredients. If the disease is severe, you can see browning on the outer surface of the plant stem.
Third, control methods
1, prevention and treatment of the disease, do not wait until after the performance of symptoms in the middle and later plants, but to prevent in advance, you can spray the surface of bacterial pesticides, mainly organic copper; If the incidence of root disease needs treatment, leaf spray effect is poor, Formulas can be selected: quinolinone + midotein + chitin, 7-10 days, 2 times in a row.
2, due to the destruction of the internal stem tissue of the stem, nutrition, water absorption difficulties, to strengthen the root maintenance and foliar spray foliar fertilizer, nutritional supplement plants, enhance plant resistance.
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