First, agricultural measures 1. Autumn plowing winter irrigation, cultivator eradication change the existing farming system, the cotton field in the autumn after the timely removal of cotton, autumn plowing winter irrigation, destruction of the winter bollworm overwhelming environment, reduce the overwintering base. After the wheat harvest, the cotton fields were promptly culled. 2. Large-area contiguous planting of corn traps utilizes the characteristics of bollworms preferring to inhabit and lay eggs on corn, planting spring corn, that is, 8 lines in cotton fields: 1 row of corn planting, 3 to 5 meters of planting a hole , 2 strains - 3 strains per hole, 100 points per acre. Make corn tassels consistent with budding cotton. The maize strains attract adult bollworm eggs and eggs to facilitate timely moth-eating. 3. Yang Shuzhi used the trapping method of adults of Helicoverpa armigera to control the senescence of poplar leaves. Manual trapping of moths was one of the simple and effective comprehensive measures to reduce hatching rate by about 20%. Second, the physical measures use the phototaxis of cotton bollworm, installed in the cotton field black light, high-pressure mercury lamp or other lamps trap adult. In particular, high-pressure mercury lamps have a significant effect in trapping and killing bollworms, which can reduce the amount of eggs lost by 30% to 40%. The killing effect of the second generation of Helicoverpa armigera was the best. The average number of moth traps on a high-pressure mercury lamp was 3,068 and the maximum amount was 9,000, which was 24 times higher than that of a black light and the control effect was 50%. 60%. According to our experiments, the closer to the high-pressure mercury lamp, the lower the amount of eggs laid and the better the trapping effect. Therefore, the large cotton field lamp distance is 200-250 meters. Third, biological control of biological preparations Prevention and treatment of cotton bollworm to human security, does not pollute the environment, will not make the bollworm resistance, but subject to environmental conditions, according to the climate, pests and other measures in conjunction with the use. In the middle of the 2nd generation of cotton bollworms, the cotton bollworm eggs of the year or spring cotton fields were flourished. Bt-781 emulsion was mixed with organophosphorus pesticides 200 times and sprayed once every 3 days. Bollworm sex pheromones can also be used to trap adult insects. Fourth, chemical control of cotton bollworm chemical control is still the current comprehensive prevention and control of cotton bollworm indispensable and effective measures. In view of the current phenomenon of single, blind, indiscriminate use, and abuse of drugs in chemical defense work, the “four unifications†should be promoted, namely: unified monitoring, unified standards, unified formulation, unified prevention and treatment, and improvement of prevention and control effects, and attention should be paid in specific prevention and control. The following questions: 1. Pay attention to mastering prevention and control indicators Based on the systematic investigation and accurate measurement and reporting, when different fields reach the prevention and control indicators, the pesticide application should be controlled in time. At the same time can not see insects on the rule, so as not to waste drugs, increase costs and reduce control efficiency. Specific prevention and control indicators are: for the first generation of cotton bollworm in wheat, when 0.5 insects per square meter of wheat field to prevent and control, in order to reduce the base of 2 generations; for 2 generations of cotton bollworm, when 100 eggs accumulated 100 or newly hatched larvae 10 Prevention and control at the head; for the third generation of Helicoverpa armigera, control when the number of 100 eggs is 40 eggs or 5 newly hatched larvae; for the 4th generation of cotton bollworm, when 100 eggs are accumulated or 10 newly hatched larvae are applied Drugs in addition to governance. 2. Grasp the key period of application in addition to control the key period of cotton bollworm application is from egg to egg hatching. According to the results of the investigation of the eggs of Helicoverpa armigera, combined with the climate characteristics, the date of forecasting the egg's height to the hatching height of the eggs is forecasted in time. 3. Note that the use of a single species of pesticide for a long period of time using alternately mixed medications will increase the resistance of the bollworm and affect the control effect. Therefore, in the process of controlling cotton bollworm, we should pay attention to reasonable alternative mixed medication. For the first generation of Helicoverpa armigera, a part of pyrethroid pesticides and 2 parts of organophosphorus pesticides such as dichlorvos were mixed and sprayed evenly 1000 times. The control effect was very good. For the second generation of cotton bollworm, the first two times of the treatment was controlled by organic phosphorus (such as Methamidophos and phoxim) were mixed with pyrethroids. The third and fourth rounds were formulated with Xinguang No.1, methomyl, and debirofol. The control efficacy was above 90%; The fourth-generation H. armigera was still dominated by a mixture of pharmaceutical agents and a combination of Xinguang No. 1, methomyl, deterring Ling and other compound agents, and pay attention to alternating drugs of the upper and lower generations, and the control efficacy was above 90%. 4. Pay attention to timely inspection to ensure that the quality of prevention and control is checked every time after the drug is administered. If the amount of residual insects is still above the prevention and control index, it shall be promptly supplemented and treated to try to eliminate the bollworm before 3rd instar. For the third generation and fourth generation of cotton bollworm spawning scattered characteristics, spraying should not be too fast when walking, mu liquid medicine is not less than 60 kg -75 kg, spraying should be uniform, so that the nozzle "two turn a deduction, All sides penetrated, so that the eggs of various parts of the insect eggs medication to ensure the quality of prevention and treatment. In addition, according to activity habit of cotton bollworm, it is appropriate to apply medicine before 10:00 am and after 5:00 pm. V. Artificially catching eggs and collecting eggs The oldest larvae that remain after chemical control are not only resistant to insects, but most of them have been plucked into flowers and cotton bolls, and it is difficult to effectively use them again, especially in the third and fourth generations of bollworms. Strong, it is difficult to completely remove the medicine. Therefore, it is an effective measure to capture large-aged larvae manually after chemical control combined with pruning rights. In the control of the third and fourth generations of cotton bollworm work, according to the growth of cotton, reasonable pruning right, complete removal of ineffective buds, removal of fruitless branches, and bring out of the field concentrated treatment, can greatly reduce the amount of eggs in the field and the amount of insects. Oviposition of eggs by artificial insects can reduce the residual rate of 28%-35%.
PECIFICATION
The Gas Light is an implement for heating. It consists of a lampholder, bolts and metal tubes. By turning the bolt, you can control the gas volume. By turning the metal tube, you can control the air volume which runs into the candleholder so that the temperature of the fire can be within your control.
Safety warning
When the gas light needs being turned off, firstly turn off the stopcock so that the fire can be put out. Then screw the needle valve and the tube. Because the gas consists of a variety of CO, guarantee that CO munts`t be run into the room in case that being poisonous and conflagration happens.
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