Agricultural ecology prevention and control of walnut diseases and insect pests, methods are flexible, diverse, economic, and simple, need to start from the following aspects: I. Selection of disease-resistant varieties. Breeding pest-resistant varieties is an important part of the prevention of pests and diseases. Because of long-term natural selection and artificial selection, the same species has formed a variety of different varieties. Its characteristics are different, and its ability to resist diseases and insects is also different. China's walnut varieties in North China have stronger resistance to disease, and Xinjiang walnut has more serious diseases after its introduction into North China. The Chinese Academy of Forestry used the hybrid of North China walnut and Xinjiang walnut to test the field resistance of the first-generation hybrid seedlings tested. The incidence of offspring in the offspring had a tendency to decrease, and the differences among individuals were large. Second, rational planting. Reasonable planting is an important measure to prevent and treat walnut diseases and pests. The cultivation measures must be consistent with the technical measures for production of walnuts, because only the requirements for the growth and development of walnuts can be met, and the technical measures to prevent the occurrence of pests and diseases can be achieved in order to achieve the goals of fast growth, high yield and high quality. 1. Select the site. Before the walnut colonization, we must do a good job in the selection and planning of the garden, choose the soil and environment suitable for planting walnuts, strengthen the management of the walnut garden, create a good growth condition for the tree, and make the tree grow robustly to reduce or eliminate the disease. Worm damage. When walnuts are planted in excessively viscous soil, the root groups cannot grow normally, and the tree vigor must be weakened. If planted on a barren hillside, the water and soil loss will be serious, the roots will be exposed, and the tree vigor will be weak. Weak trees have poor resistance to pests and diseases and are prone to pests and diseases. 2. Investigation of pests. Before the walnut seedlings are planted, the pests and diseases in the soil should also be investigated. When the underground pests and diseases are serious, they should be controlled and replanted. Before planting, deep plowing and fine-graining should be conducted to prevent water accumulation in the garden to reduce the occurrence of root diseases and defoliation diseases. At the same time lay a good foundation for future pest control work. 3. Matching varieties. The planting of walnut seedlings should use disease-resistant varieties and robust disease-free seedlings, which should be neat and consistent to maintain a certain spacing, which is conducive to ventilation and light transmission and mechanical operations. The use of green manure and dwarf crops in walnut gardens can increase soil fertility, enrich species diversity, and increase natural enemy control effects. 4. Strengthen management and protection. Most of the walnut gardens have poor site conditions, poor soil quality, lack of nutrients and moisture. Under such conditions, to obtain high quality and high yield of walnuts, it is necessary to change the management model, transform the extensive management model into a intensive management model, timely and moderately pruning, strengthen soil, fertilizer, and water management, control the load, and enhance the tree vigor. Increase resistance and eliminate pests. 1 Strengthen soil fertilizer management. Occurrence of walnut moths is directly related to the environment. Where walnut gardens are not cultivated and overgrown with weeds, walnut excavation moths occur seriously; while under the trees are used for winter turning, summer light cultivation or crop cultivation, walnut excavation moths The hazard is lighter. In the spring, we shave trees, remove weeds, and loosen the soil to reduce the occurrence of walnut limb moths. We can also eliminate pests that have crossed the ground in winter and reduce the pathogens of diseases such as brown spot and powdery mildew. Resistance to various diseases such as rot disease. 2 Scientific pruning. Scientific pruning is a key technology for producing pollution-free fruits. Through winter pruning, the structure of the tree is improved, the result area is increased, and the wintering eggs, larvae, and overwintering mites can be cut off on the branches to reduce the damage of the leap year. The use of summer shear can improve the ventilation and light transmission conditions of trees, reduce the spread of trunk rot and defoliation, and reduce pesticide residue in walnuts. 5. Clean the orchard. The litters and diseased fruits of walnut trees that are harmed by pests and diseases are often the source of damage in the following year. In the late autumn and early winter, the leaves and weeds should be completely removed to eradicate black spot and anthracnose pathogens that are overwintering. To remove powdery mildew buds in time, timely check and clean up the black spot, brown spot, walnut auger moth and walnut jerkworm damage shoots in the walnut garden, scrape the spotted walnut gardinoides, and destroy them in a concentrated manner. Or buried deeply.
Nitroxinil Injection is indicated for the treatment of fascioliasis (infestations of mature and immature Fasciola hepatica) in cattle and sheep. It is also effective, at the recommended dose rate, against adult and larval infestations of Haemonchus contortus in cattle and sheep and Haemonchus placei, Oesophagostomum radiatum and Bunostomum phlebotomum in cattle.
Contra indications.
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