From July to August each year, walnut growers often find that their own walnuts have turned black and rot before harvesting walnuts, and some have fallen to the ground. In fact, walnuts are mostly caused by walnut anthracnose because of a large number of rot and fruit drop.
Harmful symptoms Walnut anthracnose generally begins to appear on July 20th after the occurrence of symptoms that harm the fruit. When the disease is heavy, a diseased fruit often has multiple lesions. After the lesions are enlarged and contiguous, the whole fruit turns dark, the rot decays into the inner skin, and the nucleoli has no food value. When the disease is light, the outer skin of the core or shell becomes black, which reduces the oil yield and nucleolus yield.
Prevention and control measures promptly removed the sick and diseased branches and leaves, concentrated burning, and reduced the source of the disease.
Strengthen management, rational fertilization, pay attention to increase the application of organic fertilizer, enhance summer pruning work, improve ventilation and light conditions in the park, in order to help control the occurrence of diseases.
In July, the disease was promptly removed and sprayed with 2 to 3 times of 80% tebuconazole 4000 times, 10% difenoconazole 3000 times, and 80% mancozeb 800 times. In general, 600 times of copper acetate is sprayed before germination. Spraying with the above-mentioned agent before onset of flowering has better control effect.
Hainanmycin Premix,Hainanmycin Feed Addtitives,Hainanmycin Anticoccidial,Hainanmycin Chicken
Shandong Shengli Bioengineering Co., Ltd , https://www.shenglipharm.com