The best prevention and treatment period of fruit tree pests and diseases
First, the prevention and treatment of diseases and pests at the initial stage of pests and diseases is divided into three stages: initial development, prosperous development, and final development. The scope of its hazards occurs in a wide range and occurs over a large area. Diseases should be controlled before the initial stage or epidemic center has spread and prevalence, and insect pests should be controlled before a small amount of occurrence occurs before a large number of feedings have begun. The pests were controlled at the initial stage and spotting stage. Second, pests and pests in the weakest period of life control pests should be controlled before the 3rd instar, when the body is small, body wall is thin, small amount of leaves, activity is more concentrated, low drug resistance, drug killing effect. Such as the control of scale insects, can be controlled before the larvae secrete wax. Pyricularia sclerotiorum, which overwinters in the bud scales, spreads as the scales open for the initial dip; the bacterial bacterial perforating bacteria that overwinter at the diseased branch ulcers begin to disseminate at the beginning of germination. The initial dipping period is the best prevention and treatment period. Third, pests hidden hazard before the control of pests in the stems, leaves, flowers and fruits on the surface when spraying, easy to contact and death. Prevention and control of leaf roller moths should be preceded by leaf pests; prevention and control of heartworms should be in front of pods; prevention and control of pupa dry pests should be the best prevention and treatment period before or during drying. However, P. citrinopileatus was used in the early stage of adult emergence and its effect was particularly significant. Fourth, the strong resistance of fruit trees to prevent fruit trees in the bud, flowering season, the most likely to produce phytotoxicity, should try not to apply or less medication. During the period of growth arrest and dormancy prevention, especially during the wintering period of diseases and insects, the potential sites are more concentrated and the insect ages are the same, which is conducive to the central elimination. Fifth, to avoid the natural enemies at the peak of the control of insect parasites parasitoids of the adult insect resistance is the weakest, as far as possible to avoid the peak of the parasitoid eradication spraying. 6. Within the threshold line to prevent fruit tree diseases and insect pests within the threshold line, that is, apple tree fruit selling is affected by 2% to 3% of apple fruit stupid; leafhopper caterpillar, fruit tree leaves are eaten when 25%; apple aphids, each Controls are most cost-effective when there are 8 to 10 groups on 100 shoots. Seventh, according to the phenophase, the phenological period of controlling the growth and development of fruit trees is closely related to the harm of pests. For example, when the pear buds expand green, they are the buds of the pear larvae of P. sinensis and P. grandiflorum overwintering larvae; the blooming stage of P. davidianus is the overwintering stage of adult females of P. davidiana; At the time of germination, the egg hatching hazard of Pygmys olivaceus; when the new shoots of Peartree grew 7 to 10 leaves, the adults of P. erinaceus began to emerge and lay eggs. VIII. When weather and time are selected for prevention and control of diseases and pests of fruit trees, spray the medicine when the wind blows. The fog (particles) can easily be scattered by the wind and cannot be dropped. When spraying in heavy rain, the rain not only dilutes the concentration of the medicine, but also drops the medicine. It is run by the rain; when the dew on the leaves is sprayed, the leaves are easily burned. Therefore, it is advisable to choose to spray medicine from 4 pm on sunny days to early evening, with strong leaf water absorption and good anti-smelting effect. The HOLDING Tracheostomy Tube Holders are designed to provide secure positioning and to minimize movement of the tracheostomy tube. The moisture wicking lining on the adjustable neckband leaves the skin dry, reducing the risk of skin breakdown. Secure and easy to use fastener tabs fit any size trach plate. Disposable Tracheostomy Tube Holder Tracheostomy Tube Holder,Disposable Tracheostomy Tube Holder,Trach Tube Holder,Medical Disposable Tracheostomy Tube Holder Chengdu Cryo-Push Medical Technology Co., Ltd. , https://www.cryopush.com