Cotton bollworm, a pest of lepidoptera, belongs to the nocturnal moth family, it is widely distributed, harmful to many types of crops, cotton bollworm is not only harmful to cotton, other crops also occur, such as peanuts, a variety of vegetables and so on.
Cotton bollworm in the peanut growth encountered in the pest, is not particularly difficult to control, but do not look at it, it uses larvae to moth the peanut leaves and flowers (especially flowers) hazards, affecting peanut results, resulting in yield and quality decline, if not timely prevention, yield reduction is certain, as for how much yield can be reduced, it depends on the severity of the occurrence of cotton bollworms in the field (harvest is also possible).
Cotton bollworm has 4 forms, namely eggs, larvae, pupae, adult insects, the characteristics are as follows:
Egg: hemispherical, with a bulge at the top, at first, the color is white, gradually turns yellow, on closer inspection, there are longitudinal and horizontal lines on the surface.
Larvae: Newly hatched larvae, the color is bluish gray, with the progress of time, there will be a variety of types, some are pale red, some are yellowish white, some are pale green, in addition, the color of the valve line and the sub-dorsal line are not the same, so I will not introduce it too much here.
Pupae: Spindle-shaped, reddish brown to blackish brown in color, at the end of its abdomen, with a pair of hip spines and a relatively large valve.
Adults: Adults resemble moths (feathers), have wings, are about grayish-white in color, have more uniform serrations on the subfection, and have 1 end spine on the outside of the tibia segment of their forefoot.
Cotton bollworms are generally pests in the larval stage, and the adult stages are tailed, egg-laying, and reproductive hazards.
Larvae: generally around the age of 6 harm, when in the 2nd age, will eat the young leaves of peanuts, after 3 years of age, there is a feature, cotton bollworms will kill each other, to 6 years old, the larvae into the binge period, a peanut on the number increased, leaves, flowers are eaten, in addition, cotton bollworm larvae also have the habit of turning plant, this plant after eating, transferred to the next plant to continue to harm.
Adults: Adult cotton bollworms generally follow the law of diurnal and nocturnal outflow, that is, nocturnal activities, such as foraging, mating or laying eggs. When the feathered cotton bollworm will suck nectar to supplement nutrition, the time of egg laying is basically carried out at dusk and night, so that the cycle continues and has been harmful in the field.
For the prevention and control of cotton bollworm, there are many methods in biological control or agricultural control, which are described in detail below:
<h1>Biological control methods</h1>
1. Use natural enemies
Cotton bollworm has many natural enemies, can use natural enemies for prevention and control, such as bees, jumping wasps, wasps, etc., so pay attention to the protection of natural enemies, there is a good control effect.
2. Release the red-eyed bee
By releasing the red-eyed bee, to achieve the effect of prevention and control, if it is a large farmer, the planting area is relatively large, you can try.
3. Trap and kill adult insects
According to the phototropism of adult cotton bollworms, it can be trapped by using black light lamps to reduce the number of adult insects in the field, so as to play a preventive and control purpose, in addition to black lights, poplar branches or special attractants can also be used for booby traps.
<h1>Agricultural control methods</h1>
1. Insect-resistant varieties
Choosing a peanut variety with strong insect resistance, after planting, has certain advantages in the case of the same occurrence of insect pests.
2. Deep ploughing
If it is a spring peanut, before planting, by deep ploughing the land, destroying the living place of cotton bollworm eggs and pupae, turning the soil on the surface into the ground, some overwintering pupae in the field will suffocate to death. If it is a summer peanut planting area, the stubble can be reduced by medium tillage after the harvest of the upper stubble crop, reducing the feathering rate of adult insects.
3. Manual removal
If there are already cotton bollworm larvae in the field to carry out the hazard, the affected leaves can be manually removed when other agricultural activities are carried out, taken out of the field, and destroyed uniformly, which is also suitable for small growers.
<h1>Chemical control</h1>
At present, there are many insecticides for the control of cotton bollworms on the market, such as common single agents are: chlorpyrifos, methyl vitamin salts, high-efficiency cypermethrin, propyl bromophos, amidovir, octylthion, cypermethrin, etc., for the resistance of local cotton bollworms, compound agents can also be used, such as high chlorine octyl thion, propyl bromo-octyl thion, chloryanide - octyl thion, cyanide thionium, octyl sulfur , etc. In addition, there are many pesticides, go to the local agricultural store for detailed consultation.
About the relevant content of peanut cotton bollworm, the little helper said so much, from the harm and mentality of peanut cotton bollworm, to biological control, agricultural control, and finally chemical control, to explain in detail to everyone, I hope that after you read it, you can gain something.
Finally, I would like to ask you, in the process of planting peanuts in previous years, was the occurrence of cotton bollworms serious? How is it prevented?