Walnut blight is a disease caused by fungi, which mainly damages branches, especially the 1-2 year old branches are vulnerable. The first peak period of the occurrence of walnut rot disease in March-May, and most of the active pests and diseases before flowering, it is necessary to spray medicine during the flowering period to prevent insects and bactericidal. Today, Xiaobian talks about the identification and comprehensive prevention and control measures of walnut blight disease, as follows. First, the disease identification 1. The branches first invade the top shoots and then spread down to the branches and trunk. The leaves on the infected branches will gradually turn yellow and then fall off. 2, the diseased cortex will slowly lose green, the initial turn into taupe, as the disease spreads will become light reddish brown, then become dark gray. The cortex is dry and cracked and reveals a taupe xylem. When the lesion spreads to a branch for a week, the branches will die, and in severe cases, the whole plant will die. Second, prevention and treatment measures 1, thoroughly clearing the garden (1) In the spring, it is necessary to clean the dead branches, fallen leaves, and diseased fruits in the garden, and bring them out of the garden for incineration or burial. (2) Use 12.5 kg of raw ash + 0.5 kg of sulphur powder + 1.5 kg of salt + 0.25 kg of vegetable oil + 50 kg of water to prepare a whitening agent for whitening the trunk. 2. Strengthen management (1) Deep soil When the walnuts are harvested, the soil is deep-turned before the leaves are fallen, the soil is matured, the root system is promoted, and the absorption function is improved. The deep depth of the soil is preferably 20-30 cm. (2) Applying fertilizer Combined with deep turning, each adult tree will be fertilized with 150-200kg of organic fertilizer. In June-July, a nitrogen, phosphorus and potassium compound fertilizer was applied. (3) timely irrigation Timely irrigation, promote the robust growth of the tree and improve disease resistance. 3, cut off the dead branches (1) It is found that the diseased branches should be cut off in time and concentrated out of the garden for incineration or burial. (2) At the same time, do a good job of summer shears, remove dense branches, pests and branches, and long branches, improve ventilation and light transmission conditions, and reduce the incidence rate. 4, chemical control (1) In June-August, use 70% thiophanate-methyl wettable powder 800-1000 times liquid or 400-500 times mancozeb wettable powder spray control, spray once every 10 days, continuous spraying 3-4 times. (2) Prevent and control rodworm pests such as zebra elegans and walnut gibberella in time to prevent the invasion of bacteria from the pupil. China Extract Powder For Use As Dietary Supplement Extract Powder, Extract Powder Manufacturer Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.bio-pharmacies.com
