How to treat walnut black spot disease? What kind of medicine is used for walnut black spot disease? Walnut black spot disease is a problem that many walnut growers have headaches, so recently many walnut growers are consulting about the prevention and control of walnut black spot disease. The problem, so today Hui Nongwang Xiaobian has compiled a technique for preventing and treating walnut black spot disease for your reference! 1 harmful symptoms In general, walnut black spot disease mainly harms the buds, female inflorescences, fruits and leaves of walnuts. The disease occurs in young fruit, and the bacteria invade the nucleolus, causing the nucleolus to rot. After the fruit grows to medium size, the disease is limited to the exocarp, but the growth of the nucleolus is hindered and dried after harvesting. The fruit rots from the outside to the inside, often referred to as "walnut black." 2 incidence law The onset of walnut black spot disease and the extent of the disease are inseparable from rainwater, especially in the rainy years and seasons, the incidence is early and serious. 3 Prevention methods (1) Select resistant varieties, choose reasonable planting density, timely shape and trim, make the tree structure reasonable, and maintain good ventilation and light transmission conditions. When trimming, the overlapping branches, cross branches, dead branches, diseased branches and some male flowers branches are mainly eliminated, and the ventilation and light transmission conditions of the canopy and the forest land are improved, and the occurrence of diseases is reduced. (2) Strengthen underground management, apply more organic fertilizer or special fertilizer for fruit trees, and increase the application of foliar spray fertilizer to achieve the purpose of enhancing tree potential. Timely cutting and removing diseased branches, diseased leaves, diseased fruits, and peeled off the peels of walnuts after harvesting, concentrated burning or deep burying, reducing the number of pathogenic bacteria. (3) Promptly control pests such as walnut limbs and moths, and use sticks as much as possible to avoid damage to branches, reduce wounds, and reduce the chance of infection. (4) Chemical control, carefully spray 3~5 Baumeite sulphur mixture in the middle of the first month of germination. After germination, flowering and flowering, spray 1:2:200 Bordeaux mixture or 70% (mass fraction, after Same as) methyl turbulence wettable powder 800 ~ 1 000 times liquid or 50% antibacterial WP 600 ~ 800 times liquid or agricultural streptomycin 50 mg / kg solution, 70% methyl thiophanate + agricultural sulfuric acid Streptomycin. Spray every 15 days from May to July, even spray 2 or 3 times, and use them alternately to prevent drug resistance. The above is all the main points of walnut black spot prevention and control technology, I hope to help the walnut growers who need it, more exciting content Hui Nongwang will continue to update for you every day! Ankle Surgical System Medton Medical , https://www.medton.cn
