How to prevent kiwifruit bacterial ulcer disease

Kiwifruit bacterial canker disease is a kind of saprophytic and extremely low-temperature-resistant bacterial disease. The infection and transmission are hidden, and the occurrence of fulminant and destructive.

Due to the strong concealment of the disease, it is generally difficult to find out before the infection is caused by bacteria that have not flowed out of the bacterium. However, if a bacterium is found to have flowed out, the hazard has spread and spread, and when it is severely damaged, the dead tree is destroyed. Bacterial canker disease is one of the most dangerous diseases for the kiwifruit industry. The majority of kiwifruit growers should seize the key period and take effective measures to carry out comprehensive prevention.

Use resistant varieties. At present, the fine varieties used in production include Xu Xiang, Jin Kui, Hua You, Hayward and other species more resistant to disease; Hongyang and other species are most susceptible and should be carefully developed.

Choose robust virus-free seedlings to build the park. The scion should be collected on a robust tree in an orchard with no history of disease, and the cutters must be disinfected during grafting to prevent grafting.

Cultivate a strong tree. According to the age of trees, tree vigor, site conditions, do a reasonable load, prohibit the use of bulking agents; adhere to early autumn increase organic fertilizer, formula fertilization, improve the soil, improve organic matter content.

Seize the key period of spraying prevention. It is necessary to seize the prevention and treatment of diseases in the middle and late leaves of fruit trees. It is necessary to use the “Bairu” 15000-fold solution plus propiconazole 2000 times or fluorosiliconazole 6000-fold solution for about 10 days before fruit harvesting to conduct foliar spray, and also to control brown spot and enhance leaf activity to increase photosynthetic efficiency. , increase nutrient accumulation. After harvesting fruits, it is important to prevent and treat ulcers and prevent premature aging of leaves, prolong the time of assimilation of nutrients, increase the photosynthetic efficiency of leaves, and timely supplement deficiency nutrients. Available “Biao” 15000 times solution plus 0.5% urea plus 20% copper acetate 600-800 The liquid or kasugamycin 600 times solution or Garrinone 800 times solution or Guofu 600 times solution sprayed on the foliar and branches. After fruit-picking, leaf-falling and winter-cutting, pesticides were sprayed in time, and combined with Qingyuan plus acaricides and insecticides to control overwintering pests.

Pharmacy selection. In the late stage of growth, “Biao” 15000 times solution plus 20% copper acetate 600 times solution or kasugamycin 500 times solution or mycotoxin solution 400 times solution or propiconazole 2000 times solution or copper hydroxide 800 times solution or thiazole 600-fold copper or 600-fold dilution of mesitulin for foliar and branch sprays. After the deciduous use, 100% solution of copper acetate, 200 times of Garrinone, and 100 times of Schnering can be used for branch spray. The medicaments should be used alternately. Each time the interval is at least 15-20 days, the concentration of the medicament to be applied in the growing season should be small, and the concentration in the dormant period should be large. It is better to spray the medicine sooner rather than later.

Topical application. In the case of locally occurring ulcer disease, early detection, early cure, and early application should be adhered to in order to control the expansion. The applied chemicals were: copper acetate 20 times, peracetic acid 100 times, Frank 10 times, copper hydroxide 20 times, and Thiobacillus 20 times. Before the application of the drug, first scrape off the pyogenic and pyogenic lesions with a sterilizing tool and apply the above liquid directly. After a timely review and applicator, the applicator should be 2-3 times larger than the lesion.

Thoroughly clear the pathogen. When scraping pyomex and diseased skin before applying the medicine, lay plastic sheets on the ground at any time, collect them together, and bring them out of the orchard to burn or bury them deeply. All kinds of infected branches should be cut off in time. In particular, the main diseases of Hongyang varieties should be cut off, and the orchards burned or buried so as to prevent the spread of pathogens and the danger of infection. Before and after each use of the pruning knife, disinfect with 75% alcohol or 10 Baume lime sulfur.

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