Ulcer disease is one of the most important diseases in the production of kiwifruit. The disease generally occurs in the spring season, flowering period and autumn. After the onset of ulcer disease, it was ferocious and the harm was great. The lighter ones had reduced their production, the branches had dried up, and the severe ones had died and even destroyed the garden.
Symptoms to identify the disease mainly damage the plant stems, branches, leaves and buds and other parts. In general, new young leaves are poorly resistant and susceptible to invade. Small spots of greenishness appear on the newly-stained leaves, which are water-stained. They develop irregularly shaped or polygonal brown spots with a yellow halo around the edges. Newly infected, black withered; buds damaged, can not be opened; trunk and branches victim, cortical tissue was water stains, softened, shoot uplift. When the lesion expands into a strip of centimeters wide and several centimeters long, the lesions are cracked, the cortex and xylem are separated, and the lesions are dark brown or black. During the spring season, most of the trees are infected, and the cortex will seep out of the rust-like, red-colored jelly-like bacteria, which spreads with the diverting fluid and spreads straight to the xylem. In the end, the shoots were wilted, dead or the whole plant died.
The onset of the disease The ulcer disease is a kind of bacteria with strong saprophytic and low temperature resistance. It mainly overwinters on the diseased branches of trees, or overwinters with the diseased leaves and other debris in the soil, becoming the primary source of infection in the second year. The onset of disease began in March of the following spring. In late April, the peak of onset occurred. The diseased parts started from the branches of the weak branches of the trunk, buds, deciduous leaves, and branches, and would continue to invade in case of wind and rain.
The cause of the disease is low temperature, high humidity, rainy weather, sudden drop in temperature after freezing or first year of overloaded fruiting, after the resistance of the tree is reduced, it is easy to cause pathogens; the agricultural operator is bruised, and the shears in the summer shear winter shear heal slowly. It is easy to invade the disease and cause the disease.
Agricultural control applies more farmland fertilizers, improves soil structure, increases the absorption and utilization of various elements in the tree, and limits the amount of fruit to be set.
After the onset of chemical attack, small wounds or lesions, with a knife, cut three wounds up and down vertically in the lesion area, deep to the xylem, the wound must be 1 to 2 cm above and below the lesion, with a strong brush and 50 times the strength of carbendazim Squeeze on the upper blade, forcing the liquid to flow through the lesion to the lower mouth. In the onset of the disease, and the lesion is large, a small amount of liquid can be used to facilitate rapid sterilization. For example, if the lesions of the saw cut or the tree body are too large, the medical Vaseline can be mixed with anti-virus drugs. After scraping off the bad tissue of the diseased part, the paste can be used to protect the wound from infection by the bacteria and to make the new skin fast. Growth is a practical treatment.
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