Corn borer, also known as corn borer, belongs to the order Lepidoptera. Its food habits are very complex, mainly affecting corn, followed by sorghum, millet, cotton, sunflower and other crops. Since the introduction of insect-resistant cotton, I have often received reports from farmers that cotton stalks and fruit pods have been killed by cotton bollworms. The result of in-depth field inspections is due to corn borer damage. In many places in Fujian, Shandong and Henan provinces, the issue of corn borer damage to insect-resistant cotton has been reported in recent years, and the damage of corn borer against insect-resistant cotton has been increasing year by year. To this end, to remind the majority of cotton farmers planted insect-resistant cotton, we must pay attention to the prevention of corn borer. After the eggs of the corn borer hatched out of the larvae, the main stems and fruit branches of the cotton were drilled from the young tillers or leaves of the plants, resulting in the cotton plants with dead branches, broken stems, and even death. Its larvae can also droop drooping, and they can be damaged by the wind drift, which poses a serious threat to cotton production. According to field investigations, the occurrence of the first and second generations of corn borers is basically the same as the second and third generations of cotton bollworms. The second generation bollworm of insect-resistant cotton generally does not need to be controlled, but at this time, when the bud of cotton grows, the cotton plant grows young, so the cotton is most vulnerable to the damage of the corn borer and is also heavier. In the past, when planting non-insect-resistant cotton, the corn borer did not become harmful to the cotton shape due to the control of the cotton bollworm, and the corn borer did not become harmful to the cotton shape. With the popularization and cultivation of the insect-resistant cotton, the number of times of controlling the cotton bollworm by the medicine was greatly reduced, and the corn borer was often reduced. Without the simultaneous cure, the damage will become more and more obvious, and it will rise from the secondary pests to the main pests. In the year when the first generation of corn mash occurred, insect-resistant cotton was severely damaged by corn borer, and the damaged plant was as high as 10%. If it is not timely prevented, it will cause serious losses. Viewed from the field for many years, corn borer damage in the scattered cotton fields is more important than the concentration of cotton fields, so it is necessary to pay attention to the prevention and control of corn borers. To do a good job in preventing and controlling corn borer, it is necessary to strengthen pest monitoring and seize the key period of application. Grab the corn pupa spawning period, the larvae hatching early, when the insect cotton plant reached 3% immediately spray control. To use pesticides that have good insecticidal effect and are safer for natural enemies, it is possible to use 30% of endosulfan-emulsified oil 1000 times, or 20% of doudophos EC 1500 times, or 2.5% of kanthrin-1000-fold, or 40% of isocarbophos Emulsion 800 times spray. A mixture of 1.8% avermectin and 10% imidacloprid wettable powder 1:2 can also be sprayed 1500 times. In order to increase the effect of spraying, it is advisable to spray after 4 pm. Prior to cotton topping, the use of 100 times the 40% monocrotophos EC, or 100 times 35% cotton and phosphorus EC drops of the drug injection, has a good control effect, but also to protect natural enemies. In addition, combined with management measures such as pruning in the field, artificial ovulation, insect trapping, and taking the branches out of the field, can eliminate a large number of pests.

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