How to manage walnuts in July and August? What diseases and insect pests need to be controlled?

How to manage walnuts in July and August? What diseases and insect pests need to be controlled? Walnuts in July and August can be managed with reference to the following methods: first, water and fertilizer management water-hung trees have basically fixed fruit size in July and entered the shell hardening period. There is no need for artificial watering during this period. Too much soil moisture will cause fruit shell whitening and fruit tip whitening, affecting the beauty of the fruit surface and difficult to sell, so the drains and drains in the orchard and tree plate should be dug as soon as possible. For individual trees, when the water cannot be drained or permeated, it can be used at the base of the stump to circle the tree with burnt honeycomb coal and pay attention to the surface above the stagnant water, which will save lives. Young trees that are fruitless do not need to be watered too much. Because 60% of the top flower buds have been differentiated, and the moisture is high, the autumn shoots will have to grow for the second time, topping off the female flower buds that have already grown, resulting in secondary fruitlessness. In addition, the trunk will be developed into a large flagpole several meters high. If there is no dripping rain in the flood season in a special year, it can be properly watered according to the situation of the trees in late August. Fertilizing walnut in July and August, the demand for fertilizer is basically small, especially do not topdressing nitrogen fertilizer. Some fruit growers think that it is easy to rain, so hurry up to apply some fertilizer, but they do not realize that this is the most dangerous move. A tree grafted for three or four years will be sentenced to death within five days with a pick of dung, such as a sunny day after rain. And topdressing at this time, will cause the hard shell is not hard, gray; green skin long, the hard shell is not long phenomenon. For young trees, topdressing at this time will cause "running strips" and will not bear fruit in the second year. July and August is also the filling and ripening period of walnut seeds. Starting from the first ten days of July, potassium dihydrogen phosphate and topiramate are sprayed every half a month. If black spots are found on the tree trunk and fingers are pressed to flow out of the black water, 0.3% rotting (9281) + 0.3%PBO liquid can be sprayed three times in a row. The purpose of spraying potassium dinitrogen phosphate and PBO is to accelerate the hardness of fruit shell and the enrichment of kernels, increase the weight, accelerate the differentiation and fullness of flower buds, and delay the growth of fruit front branches and overgrown branches. Second, the prevention and control of diseases and insect pests there are many diseases and insect pests in walnut trees. Here are several simple pest control methods. The disease with high incidence in the hot and humid rainy season is walnut bacterial black spot. The symptoms are: at first, there are small black spots on the leaves, and in severe cases, the disease spots are linked together to form a perforation, causing the leaves to fall in advance; after the fruit is damaged, there are also small black-brown spots, then expand into a circle, and sink, and the fruit decays from the outside to the inward. in severe cases, the fruit falls early. Prevention and control methods: first, combined with pruning, remove diseased branches and fruits; second, use 50% methyl topiramate or acetaminophen wettable powder 500-800 times, once a half month, spray three times in a row; third, use a knife to longitudinally scratch the black spots on the stump, and brush the disease with a brush until there is no foam, twice in a row at an interval of 10 days. Walnut powdery mildew mainly harms leaves and buds. Untimely management can cause defoliation and even seedling death. The symptoms are as follows: there is a layer of white powder on both sides of the leaves and yellow patches on the leaves at the initial stage. Prevention and control methods: reasonable fertilization, irrigation, timely cutting off diseased leaves. Drug prevention and treatment can be the same as above, or spray twice with 25% trimethoprim 500-800 times solution, once every 10 days. Pest control in July and August, attention should be paid to the control of paramecium, small gibberellin and American white moth, which can be controlled with cypermethrin. Click to get more hickory planting techniques click to get more fruit planting techniques