Red spider mites (Salvia spp.) are the major threats to the later growth of various crops such as cotton, corn and cowpea. Here, the author extracts the living habits, occurrence rules and control methods of red spiders as follows, for the reference of the majority of farmers. At the same time, we remind all farmers that they must pay close attention to the pest situation in the near future and do a good job of prevention and control in a timely manner so as to avoid losses caused by hazards.
I. The habit of red spiders
Red spider is an important pest in cotton buds. With Cheng Hao and Ruo Yee spinning on the host, they sucked the juice under the net. After the cotton leaves are damaged, the leaves turn red and the plants decay prematurely, causing the bells to fall off, seriously affecting the yield and quality. In addition to damaging cotton, cotton leaves also harm corn, sorghum, beans, beets, melons, vegetables, and hops. Cotton leafhoppers are clustered over the winter in the rhizosphere of litters, bell-shells, earth seams, sub-films and weeds in the rhizosphere with eggs or fertilized females. Breed 8 to 10 generations a year. When the temperature reaches 7°C in early spring, activities are resumed. Weeds or overwintering hosts first feed on 1 or 2 generations, and in early May, they move into cotton fields. From July to August, the most serious damage occurred at high temperature and drought. In general, continuous cropping, extensive management, excessive weed counts, and cotton field leaf crops that occur in areas close to vegetable and sandy soils occur early and are heavy. Red spider like high temperature, high temperature drying is conducive to growth and development, at 15 ~ 30 °C with the increase of temperature, the time required for each insect stage shortened at 20 ~ 27 °C when the most favorable growth of leafhoppers.
Second, control methods
When it comes to prevention and control, we must adhere to the principle of "prevention-based, comprehensive prevention and control."
1. To carry out autumn plowing and winter irrigation in time to eliminate overwintering female pupae in the fields.
2. Rotation of crop rotation: This measure has a great effect on the prevention and treatment of leafhoppers. At present, the area of ​​cotton fields is large and it is difficult to fully implement it. However, when severe field crops occur in the year, the next year must fall.
3. Timely and thoroughly remove the weeds in the fields, mantle, and drains, reduce food and breeding sites for leafhoppers, reduce the number of insects, and prevent them from being transferred to the fields. Generally from the middle of May to start playing blockade zone around the cotton field, with omethoate 1:1000 times spraying ridges, roadside weeds, eliminate the source of infection, reduce the number of locust into the ground, preferably 2 to 3 times.
4. Avoid intercropping with crops such as beans to prevent them from transferring to each other.
5. Protect grasshoppers, ladybugs and other beneficial insects, and make full use of natural enemies to control the damage of leafhoppers.
6. Find hazard plants to remove and destroy in time.
7. Chemical control. In the near future, special attention should be paid to strengthening the monitoring and prevention of spider mites. If you find that red spiders have occurred, you need to immediately take control of the spot. When the hazard is heavy, it can be sprayed all over the field. It can be mixed with nisolulene or tetrazine for use with acicicides such as chlorpheniramine, hydrazine, and acetylene, to achieve the purpose of killing eggs, eggs, and eggs. As the cotton leafhoppers on the back of the cotton leaf are spoiled and spawned, they have a strong concealment and are not easy to contact. The specific acaricides are mostly contact agents. In order to improve the control effect, it is necessary to achieve a large amount of water and a low concentration, break through the nets, and make the leafhoppers come into contact with medicaments to play a role in killing. When spraying, especially on the back of the middle and lower leaves should be sprayed thoroughly, spray once every 7 to 10 days, even spray 2 to 3 times up to better control effect. At the same time, we must rationally select pesticides and use them alternately to prevent pests from developing resistance. Special Note: For cowpea, fresh corn, vegetables and other crops, we must focus on prevention, and at the same time we must improve the technology and level of pesticide application. We must use biological agents as the best choice for the application of pesticides, and be environmentally friendly with high efficiency, low toxicity, and low residue. Pesticide control, do not arbitrarily increase the dosage, can not rule the treatment, can not only cure the rule, reduce the frequency and area of ​​application, and strictly implement the pesticide safety interval.
Surgical suture in medical surgery of human tissue and ligation. Surgical suture could be divided into Absorbable suture, Non-absorbable suture.
The suture is processed by collagen or synthetic polymers from healthy mammal and it can be absorbed in vivo mammalian tissue.
Absorbable suture include: PGA(Polyglycolic Acid), CC(Chromic Catgut), CP(Plain Catgut), PGAR(Rapid Polyglycolic Acid), PGLA(Polyglactin 910), PDS(Polydioxanone), MO(Poliglecaprone);
Non-absorbable suture include: SK (Silk), NL(Nylon), PM(Polypropylene), PB(Polyester), SW(Stainless Steel Wire).
Surgical Suture,Absorbable Sutures,Nylon Suture,Subcuticular Suture
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