Grape black pox, also known as "bird eye disease", is a major disease on grapes. The main damage to the grape's green young parts if the real, fruit stems, leaves, petioles, shoots and tendrils and so on.
At present, the grape has been flowered, and it is a crucial period for preventing and controlling grape black spot disease. Symptoms of different diseased sites are as follows: The young fruit is susceptible, the surface has dark brown dots, and then expands to a central grayish-white, dark brown halo with lesions on the edges, showing a "bird's-eye" shape, with hardened later cracks. The disease department is only on the skin, not deep and flesh. The onset of the cob causes the panicle or part of the spikelets to develop poorly or even die. Fruiting stem disease can make fruits dry off or rigid. The new shoots produce grayish-black edges, purple-brown spots, cracks in the middle depressions, and are dead when severe. The lesions of the central grayish violet-violet halo appeared on the leaves, and the central part of the leaves became dry. The specific incidence of different environmental conditions is as follows: When grapes start to sprout, the disease begins to appear. In spring and early summer, the temperature rises and it is rainy. It begins to develop. At 28-30°C, there is frequent rainfall and high humidity. Plants grow a large amount of green tissue and the incidence peaks. The spring and early summer rain are heavy and the disease is heavy. In drought-prone or less rainy regions, the onset of disease is significantly reduced; low-lying areas and poorly-drained orchards are afflicted; poor cultivation and management, declining tree vigor, and insufficient or improperly applied fertilizers can all induce diseases. Unclear parks or clear gardens are not thorough in the winter, and there are a large number of sicknesses left in the park, which may be heavy in the following year.
Prevention and control technology points: After the grapes are spread to the coloring of the fruit, spray once every 10-15 days. Among them, the spraying is the most important before and after flowering, 70%-80%. Because of the prevalence of susceptible patients during this period, the incidence rate is the highest. The medicament can be used as follows: 1:0.7:200-240 Bordeaux mixture, 65% Zeocene wettable powder 500-600 times, 50% carbendazim wettable powder 1000 times or 75% chlorothalonil wettable powder 600 times. Mancozeb 600 times liquid, 1.5% polyoxin 800 times to control blackpox disease is very good. At the same time, to strengthen management, topdressing should use nitrogen, phosphorus, potassium and trace elements in the whole fertilizer, to avoid the separate, excessive application of nitrogen fertilizer, to do a good job of drainage after the rain, prevent orchard water. Weeding, picking and arranging vines, etc.
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