To improve the control effect of cotton bollworm, rational drug selection is the key. Among the pyrethroid pesticides, enemy killing, cypermethrin, beta-cypermethrin, kungfu, etc. are effective in controlling cotton bollworm, and are mainly used to control three generations of cotton bollworm. However, the production of cotton aphid has been highly resistant to such pesticides, and the control of cotton aphid is almost ineffective. When a cotton aphid is mixed with cotton bollworm, pyrethroid pesticides are generally not used. Among organophosphorus pesticides, phoxim has a good effect on the control of cotton bollworm, but phoxim is easy to decompose when light is visible, and the efficacy period is short. The monocrotophos has a wide spectrum of insecticidal activity, and has control effects on cotton bollworm, cotton aphid, red spider, etc., but the effect is general. It is difficult to control the hazard by using monocrotophos alone in the occurrence of cotton bollworm, and should be mixed with other agents. Among the carbamate pesticides, methomyl (Wanling) has a good effect on the control of cotton bollworms and can kill young larvae and eggs. Among the compounding agents, cotton boll, jingling, and Xinguang No. 1 have obvious effects on the control of cotton bollworm. Among biological pesticides, Bt preparations can control cotton bollworms, which can be sprayed at the peak of hatching period, 2 to 3 days earlier than spraying chemical pesticides, and have higher control effect on newly hatched larvae. In addition, do a good job in pest investigation, timely spraying and prevention; improve spraying methods to improve the quality of prevention and control; alternate use of pesticides, delay the generation of pest resistance, etc., is also a key measure to control cotton bollworm.
100LEDs Crystal Ball Solar LED Outdoor Garden Christmas Decoration Waterproof String Light.
The solar lamp is charged during the day and automatically lights up at night because there is a voltage detection circuit inside the lamp, which detects that the voltage of the solar panel is high during the day, and the detection circuit outputs a control signal to turn off the lamp, and the voltage of the solar panel is almost zero at night. , the detection circuit outputs a control signal to light the lamp. Below we introduce a simple and easy-to-make automatic control circuit for solar lamps. As long as the circuit is added with a solar panel and a rechargeable battery, a solar lighting lamp can be formed.
During the day, due to the high voltage of the solar panel, the â‘ pin of the IC is high level, the output of its â‘¡ pin is low level, the N-channel MOS field effect transistor VT is turned off, and the LED light connected to its drain does not light up. At night, the voltage of the solar panel tends to zero volts. At this time, the â‘ pin of the IC is at a low level, and its output becomes a high level. By adjusting the potentiometer RP, the lamp can be lit in a suitable light. VT can choose AO3400 SMD MOS field effect transistor in SOT-23 package.
Solar Crystal Light,Waterproof String Light,LED Outdoor Garden Christmas Decoration Dongguan XINYUDA Technology Co., Ltd. , https://www.gdxige.com