What are the symptoms of tea seedlings? What is the prevention method?
Tea trees are an economical crop that is widely distributed throughout the country. Because people in some areas like tea very much, the price of tea is generally not low. Tea trees are relatively disease-resistant crops, but occasionally some diseases occur, such as tea seedlings, which seriously affect the life of tea trees. Let's take a look at the harmful symptoms and prevention methods of this disease.
Distribution of tea seedling blight: This disease mainly occurs in the tea planting area in the south, which is generally caused by the base of the tea seedling stem and the newly grown treetops.
Symptoms of tea seedlings: The lesions are dark brown at first, oval or irregular, and become grayish white at the later stage. The lesions sag slightly, with many black small spots on them. The disease eventually causes the leaves of the tea tree to fall off and the plants to die.
The occurrence period and epidemic conditions of tea seedling blight: tea seedlings with high temperature and high humidity, generally began to develop in early April, and prevailed in the summer and autumn of August-October. The transmission route mainly through wind and rain.
Tea seedling blight prevention and control methods:
(1) Tea trees should pay attention to drainage to prevent high humidity. Once the diseased plant is found to be immediately removed and burned, the source of infection is reduced.
(2) Strict plague should be imposed when transporting tea seedlings.
(3) In the early stage of tea plant blight, use 0.7% lime half-quantity Bordeaux mixture or 50% carbendazim, 70% methyl tropazole 1000-fold dilution, fulvic acid salt or 75% of 100 800-fold dilution of bacteriological clear, 5×10-5 dilution of actinone, and 600-fold dilution of dexamethasone.
The above is a more detailed introduction of tea tree blight. If you want to be able to distinguish between the symptoms of tea tree blight and other diseases, you should carefully observe and find out the disease immediately.
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