In recent years, grape white rot has become a heart disease that has plagued many fruit growers. Zhang Zhicheng, a fruit specialist at the Northwest A&F University, introduced that white rot of grapes is also known as rot, water rot, and ear rot. It mainly damages the ear and damages shoots and leaves. . Once the white rot occurs, it often leads to a large area of ​​grape production, or even no harvest.
Winter is not a mistake
Zhang Zhicheng said that some fruit farmers simply do not know that this is also an ideal period for the prevention of white rot, and that only in the May and June of the following year began to control, in fact, this is a misunderstanding on understanding. The pathogens of white rot are mainly contaminated with spores or conidia with the diseased body on the surface of the soil and the surface of the soil overwintering; debris after rot decomposition; bacteria can be rot in the soil for 1 to 2 years. The distribution of pathogenic bacteria in the soil was the highest in the range of 5 cm in the topsoil. The deeper the number of pathogenic bacteria was, the more pathogenic bacteria were still present at 30 cm. In addition, pathogens can also winterize on diseased fruit and diseased shoots with conidial devices. The pathogenic tissue of wintering will produce conidia and conidia in the second spring when the environmental conditions are appropriate. Conidia spread by rain splashes, invade through the wound, causing initial infection; later on the lesions produce conidia and conidia, conidiospores after distribution caused by re-infection. The onset period is sooner or later due to different weather conditions. East China usually begins disease in the middle of June; North China is in mid-to-late June; Northeast China is in July. The epidemic is generally in the rainy season before harvest, from July to August.
Symptomatic prevention is the key
When talking about comprehensive prevention and control measures, Zhang Zhicheng said that in fields where disease is often prevalent, as much as possible to prevent the cultivation of susceptible varieties, choose high resistance and good resistance, good quality, high rate of high resistance and medium resistance varieties. In addition, we must increase the application of high-quality organic fertilizers and bio-organic fertilizers to cultivate soil fertility, improve soil structure, promote plant root development, make it grow and flourish, and enhance disease resistance. In addition, increasing the area of ​​the result can also reduce the chance of ground pathogenic bacteria being contacted and effectively prevent the infection of pathogenic bacteria. Of course, chemical control is the most important, and cleaning the garden in winter is the most critical. The pathogens of white rot are mainly wintered in the soil. After the branches are unearthed, the white rot pathogen is most easily carried. Therefore, the 200-300 dilution of white rot is used to spray the plants before and after the soil is sprayed, which can effectively kill the pathogenic bacteria in winter, and can also add 1% of talcum powder or 2% of fiber. Su. The timely and reasonable use of the clear garden in winter can have a multiplier effect in preventing and controlling white rot. Due to the unique bactericidal mechanism of white rot, it is not easy to produce resistance to harmful insects, and it has obvious growth-promoting effect. It can be used throughout the growth period, and it can be diluted 1000-1200 times for disease prevention and 500-800 times for treatment. , dipping ears can be. In addition, the reporter learned from Shaanxi Senhe Biotechnology Co., Ltd. that the multidisciplinary experts formed by the School of Life Sciences at Northwest University have been successfully developed after many years of experiments and improvements based on the principles of plant preventive immunology, plant microecology, and plant nutrition. Strong antibacterial bactericide white rot in the national grape production area for many years of experiments in the control effect is also very significant, stand out in the comparative experiment, the test found that the white rot of the net chemical properties are very stable, with a variety of related pesticides Liquid fertilizer compound use. It has become the biggest nemesis for the prevention and control of white rot in grapes, and has been recognized by industry experts and friends of fruit farmers.
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