Vitis vinifera, also known as spleen disease, mainly harms shoots, but occasionally also harms shoots and fruits. Ordinary old orchards have a more serious disease, and the incidence of new orchards is less.
1) symptoms. Vitis vinifera occurs mostly on twigs over two years of age. When the diseased site begins to show symptoms, the infected site is red-brown, slightly sag, and gradually expands. The lesions are fusiform and the dents are rotted and become dark. Brown to dark brown, later in the lesions produce many small black spots, namely the conidia and ascospora of the pathogen. When it is rainy or wet, a light yellow, gummy filamentous spore angle emerges from the top of the black grain point. In the fall of the second year, the epidermis at the diseased branch is longitudinally torn, exposing filamentous vascular bundles. When the disease occurs seriously, the dendrite above the diseased part grows weak, the internode shortens, and the leaves, ears and grains become smaller, the quality of the fruit deteriorates, and sometimes the leaves become yellow and wilting.
2) Incidence conditions. Cultivated varieties also have a certain relationship with the severity of diseases. Generally, orchards with low topography, soil viscosity, poor drainage, poor soil, and insufficient water and fertilizers, as well as vines with extensive management, pests, frostbite, or other root diseases, have become ill. More severe, wet and damp weather is also conducive to disease.
3) Control methods.
1 cut scraping disease. During the onset of the disease, it must be diligently checked and early detection of the disease should be promptly cut off. The lesions found on the old vines can be scraped off with a knife, and they are scraped until they see the disease-free healthy tissue, and the diseased bodies are burned to prevent the spread of germs. The scraped wound was coated with 5 degrees lime sulfur, or 40% Formamide 50 times, to protect the wound from infestation.
2 Strengthen orchard management. The growth potential of grape vines is highly related to the resistance to grapevine disease. Fertilizer and water supply are adequate and reasonable. Field management is meticulous, timely, and fruit load capacity is appropriate. It can maintain the vitality of plants and enhance the disease resistance of trees.
3 chemical control. Before the grape sprouts, it can be sprayed once with 3 to 5 degrees of lime sulfur plus 200 times the mixture of sodium pentachlorophenol, which can also cure other diseases.
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