How to prevent cherry root cancer?
How to prevent and cure root cancer of cherry blossoms?
The tumor at the root neck of cherry blossoms is caused by a bacterium of the genus Agrobacterium, called cherry blossom root cancer. The most obvious symptom of the disease is the formation of globular or hemispherical nodules at the root neck. At the initial stage, the tumor was white and soft, then gradually enlarged and Lignified. The surface of the tumor is rough, brown or dark brown. The root cancer disease of cherry blossoms often leads to poor growth of the aboveground parts of the plant, yellowing of the leaves and death of the plant in severe cases.
The pathogenic bacteria of cherry blossom root cancer survive the winter in the surface layer and soil of the diseased plant. When the surface part of the tumor is decomposed, the bacteria enter the soil and can survive in the soil for a few months to a year or so. Pathogenic bacteria are mainly transmitted by irrigation water or Rain Water, and can also be transmitted by grafting tools or underground pests. Often invade plant tissue from graft interface and mechanical wound. The disease is serious when the soil is heavy, the humidity is too high and the barnyard manure is overused.
The prevention and control measures of cherry blossom root cancer disease are as follows: first, strengthen seedling quarantine and select "disease-free" plants. All kinds of mechanical wounds of the plant were soaked in 1% copper sulfate solution for 5 minutes, washed with clean water and planted. Second, when mild diseases are found, the cancer should be removed in time, and the wound should be protected by plant ash or sulfur powder. The seriously diseased plants were uprooted and burned. Disinfection of diseased soil can be mixed with chloropicrin after being evenly sprinkled with 60: 120 grams per square meter.
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How to prevent and cure the root nodule disease of cherry blossoms
The gorgeous cherry blossoms are loved by people, but they are susceptible to a deadly root nodule disease. The disease mainly occurs on the trunk and lateral branches of the root and aboveground parts of cherry blossoms. In the early stage of the disease, the rhizome was swollen with a spherical or hemispherical tumor, and the young tumor was white, soft and smooth. After that, the tumor gradually enlarged, hardened, brown or dark brown, the surface was rough and cracked, and gradually infected the main root, lateral root and even capillary root from the rhizome, and each node expanded into tumors of different sizes, which caused the cherry blossom to grow slowly or even stop growing, and the whole plant withered in 3 to 5 years.
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How to prevent the harm of red spiders to cherry blossoms?
How to prevent the harm of red spiders to cherry blossoms? Most of the red spiders that harm cherry blossoms are mountain plant leaf mites, also known as mountain plant red spiders. Red spiders mainly harm the leaves of cherry blossoms. In early spring, the adults and nymphs clustered on the back of the leaves, and their mouthparts were pierced into the leaf tissue to suck the juice, so that the affected leaves showed green loss spots, and when the leaves were severe, they scorched and fell off early. The female adult of the red spider planted in the mountain is 0.5 mm long and oval, with 26 bristles on the back of the body. The body of the worm is red, which can be divided into winter and summer types: bright red and silk luster in winter; red when molting in summer, and after feeding
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