To control insects by insects is to control aphids in the wheat field to kill the ladybugs of the aphids (people commonly called "flower girl"), spiders (not a red-yellow spider that harms wheat, is a glass wire shouted by people) and grasshoppers. Among them, ladybugs will prey on any soft, small-sized insects, and most likely they will eat maggots. According to statistics, a seven-spot ladybird can eat 138 beetles per day on average; farmland spiders also prey on predatory aphids; grasshoppers have a very large predation period and predation on their larvae, which can eat more than 100 locusts on an average day.
These natural enemies of these locusts have such strong control over wheat aphids and they are pollution-free. Therefore, we should fully protect, develop, and use them. The specific method is as follows: Observe at any time and pay attention to the ratio of beneficial insects in wheat field. Under normal circumstances, when the ratio of the enemy to McCain is greater than 1:150, it is not necessary to carry out chemical drug control so as not to injure the natural enemies and the wheat aphids themselves will be controlled.
The second is safe drug use. That is, when the average single stem pod volume reaches 5 or more, the ratio of hazards to virulence is less than 1:150, and there is no heavy wind and rain in the near future. When drugs must be applied to wheat fields, drugs that are safe for natural enemies should be selected. For example, 50% anti-inferiority WP, spray 6 to 8 grams per mu 50 to 100 kg spray, and try to avoid natural enemies sensitive application period. In order to improve the overall effect of prevention and control, it is also possible to selectively control triadimefon, diflubenzuron, and anticonvulsants, such as wheat rust, powdery mildew, armyworm and wheat aphid, to prevent and control various pests.
The third is the use of weather. Because wind and rain are also natural enemies of locusts, they have a strong control of the killing effect of wheat aphids. Therefore, depending on the circumstances, the application of the drug may be postponed or not applied during the stormy weather. In order to effectively protect natural enemies, they will be able to use each other's functions.
As long as we protect the natural enemies of locusts, fully mobilize their enthusiasm to kill and remove locusts, which not only saves time and saves costs, but also eliminates the difficulty in grasping the best timing and dosage in human control.
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