The cotton-blind staghorn is a hemiptera cotton pest with high fertility. The damage period is from mid-May to early October. Because of its sucking mouthparts, the nymphs and adult skin have a layer of waxy, crawling quickly, strong ability to move, although most of the stomach poison and contact poisons are effective, but the effect is not very satisfactory, and some cotton farmers every day The fight against drugs can not be ruled, we found in the production practice, using the following few strokes can effectively control cotton blindness.

First, using the specific drugs through our repeated tests and demonstrations on the pesticides on the market, the best effect is to use phoxim and malathion to reconstitute pesticides. The virulence test results showed that the death rate was 100% corrected in two hours, the laboratory test result was 98%, and the field test result was 95%, which was the first place in the pesticides. Phoxim is a highly effective and low-toxicity pesticide that has a strong knock-out power against the blind locusts. However, due to the short residual period, pests that are used alone often die and resurrect. Malathion has three drug effects: stomach toxicity, contact toxicity and fumigation. It is a broad-spectrum insecticide. Although its efficacy is long, its knockdown ability is not as good as phoxim. The two drugs have the advantage of complementing each other after compounding; therefore, they have the best effect and indeed have the prevention and control effect of “front and back side”. Currently, 25% of pharmathiamone and 20% of bells are sold on the market. If they are not available, they can be compounded by themselves. When cotton bollworms occur at the same time, appropriate amounts of methamidophos are added. , it will play a multiplier effect.

Second, to seize the key period of the dominant population in the North is the green-lipped lynx, 5 to 6 generations a year, the first critical period of control in the middle and late May, this time is the first generation of winter nymphs in the tree overwintering peak period, A large number of hazards of migrating cotton fields, but also the second generation of nymphs wintering in the field of weeds hatched in large numbers and transferred to the cotton plant on the end of the harm period, this is the first time of centralized control, field inspection rate of new damaged plants 1% to 2% ( New black cotton buds emerged as the newly-damaged strains at the top of the cotton plant.) Control was initiated when 100 plants had 1 or 2 insects. The second critical period of prevention and control was in the middle and early June. In the budding stage, cotton was also the nymph eclosion stage of the second generation of green nymphs. A large number of adult insects transferred cotton fields in succession, and the number of newly-infested strains in the field was as high as 3% to 5%. There are 3 to 5 strains of insects, it is necessary to pay close attention to prevention and treatment. The first and second generations occurred relatively neatly, as long as the prevention and control were timely and relatively easy to rule and live. From the end of June to the third generation of the nymph incubation period, there will be overlaps of generations, no obvious development of the algebraic boundaries, and the tightness of the cotton fields. It will be particularly difficult to prevent and control. The top of the main stem and the top of the fruit branches shall be promptly inspected, when the field is newly killed. The strain rate is 5% to 10%, and 100 strains have more than 5 insects. It should be controlled in time. Generally, it is controlled every 7 days until late September.

Third, the system of defense against leaving no residue

1. In order to prevent transfer hazards, joint household control should be carried out. 2. We must do a good job of agricultural control. Remove weeds in the field in time, do a good job of prevention and control of the surrounding host; strengthen the management of cotton fields, prevent overgrowth, reduce the number of insects, etc. 3 treatment must be thorough. Each time the agent is controlled to achieve "complete, clean, leaving no residue" effect. After the prevention and control, the inspection should be carried out. Residues should be controlled below the prevention and control index. When the amount of insects in the cotton field is large, continuous treatment and thorough treatment are required to control the chance that the cotton cocoon continues to multiply in the cotton field.

A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar (or flea) immersed in a liquid to spin very quickly, thus stirring it. The rotating field may be created either by a rotating magnet or a set of stationary electromagnets, placed beneath the vessel with the liquid.

Magnetic stirrers are often used in chemistry and biology, where they can be used inside hermetically closed vessels or systems, without the need for complicated rotary seals. They are preferred over gear-driven motorized stirrers because they are quieter, more efficient, and have no moving external parts to break or wear out (other than the simple bar magnet itself). Magnetic stir bars work well in glass vessels commonly used for chemical reactions, as glass does not appreciably affect a magnetic field. The limited size of the bar means that magnetic stirrers can only be used for relatively small experiments, of 4 liters or less. Stir bars also have difficulty in dealing with viscous liquids or thick suspensions. For larger volumes or more viscous liquids, some sort of mechanical stirring is typically needed.

Because of its small size, a stirring bar is more easily cleaned and sterilized than other stirring devices. They do not require lubricants which could contaminate the reaction vessel and the product. Magnetic stirrers may also include a hot plate or some other means for heating the liquid.

Lab Stirrer

Lab Stirrer,Lcd Digital Overhead Stirrer,Lab Overhead Stirrer,Digital Magnetic Hotplate Stirrer

Unimedsume Trading Co., Ltd , https://www.ums-labmed.com