Melon (also known as aphid) is very fertile. Some peasants asked why Guam was hit more and more. This is because: First, cure is late. In the summer, it takes only 4 to 5 days to complete the first generation of quails. Therefore, the number of quail larvae grows at an alarming rate. If the amount of insects is too large or the crop leaf is rolled up, it will be late. The second is improper use of drugs. For example, pyrethroid pesticides started to work very well. Because farmers used them individually, they quickly developed resistance, and their effects became worse and worse. They had to increase their concentrations. This would kill a large number of natural enemies, resulting in fewer or fewer natural enemies. The locusts are bound to be paralyzed.
Alternating use of pesticides is not easy to produce drug resistance, effective drugs are: 25% Soruk EC 800 ~ 1000 times, 20% Chrysanthemum EC 800 ~ 1000 times, 10% imidacloprid WP 2000 ~ 3000 times, 2.5% Bifenthrin (Uranus) EC 2000~3000 times, the above agents are used in the initial stage, and sprayed once every 10 to 15 days. Some pharmaceuticals, such as the imported Tuofeng WP and the domestically produced Kangwei WP, are highly specific and effective only for plaices such as Peach, Radish, and Brassica. Very poor. Therefore, it can't be used to prevent melons.
If there is a locust in the cucumber in the protected area, it can be controlled by the method of smoking. Each can use 10% to kill 300 grams of melon scorpion smoke, or 20% of dichlorvos smoke agent 200 to 250 grams, or "blue smoke" III-2 200 grams of smoke agent. The method of spraying is: In the evening, the medicine is divided into 4 parts, scattered at 4 points, and the greenhouse is closed. In addition, smoked granules II can also be used, each 300 grams per acre, the medicine bag cut a small mouth, 10 points spread around the aisle on the left and right ground, the man closed immediately after the exit room, the temperature maintained at 20 °C ~ At 35°C, the effect is not good when the temperature is too low, and the temperature has an effect on the crop growth when the temperature is too high. In the winter, early spring and late fall seasons, it should be applied in the morning and sealed for 24 hours after application. Summer, late spring and early autumn should be performed in the evening and closed for 12 hours after application.
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