Occurrence and control technology of cotton cotton bollworm
Cotton bollworm is a typical omnivorous pest. Taking cotton and a few crops as the feeding object, in addition to the nutrient organs that can directly eat plants, the main larvae are the buds and flower bells of the cotton, and a larva can be about 20 bud bells in a lifetime. And it has the habit of diversion, and the moth cotton bell is easy to rot, fall off or become a stiff flap, so it is a great threat to cotton yield.
First, the occurrence of cotton bollworm
Cotton bollworm occurs in Xinjiang for 3.5-4 generations a year, with more serious generation overlap, overwintering in 3-10 cm of soil with pupae, and feathering begins when the temperature is above 15 °C from mid-April to early May. Adults hide in a hidden place during the day and are inactive, flying out after sunset, looking around for flowering plants, eating nectar, and replenishing nutrition. Eggs can be laid after mating, and a female moth can lay about 1,000 eggs. Adults have phototropism and are also strongly tendentious to semi-withered poplar branches.
Cotton bollworm eggs
Larval infestation
Cotton boll pupae
Sexual envelopment
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Second, the comprehensive control of cotton bollworm
Prevention and control strategy: starting from the ecology of farmland, based on agricultural prevention and control, protecting and using the natural ecological regulation of natural enemies as the center, taking booby-trapping prevention, chemical control and supplemented by artificial insect catching, pupa digging measures, relentlessly curing the top of the generation, pressing the base number, reducing the pressure on the second and third generations; lowering the second generation of bao buds, lowering the base number, reducing the pressure on the prevention and control of the third generation; controlling the third generation of cotton peaches, reducing yield loss; sweeping the four generations, reducing the base number of the next year, and controlling the harm below the level allowed by the economy.
1, agricultural control: (1) do a good job in autumn ploughing and winter irrigation, can destroy the pupa chamber of cotton bollworm, improve the overwintering mortality rate, reduce the base of cotton bollworm in the next year; (2) manually dig pupae in early spring, reduce the population base of overwintering bollworm; (3) strengthen field management, shape the plant type with stable growth and abundant yield, prevent long growth and greedy green and late ripening, and worsen the living environment of cotton bollworm. At the peak of feathering of first- and second-generation adults, 100-150 g/mu of potassium dihydrogen phosphate was sprayed. (Avoidance, reduction of egg drops)
2, booby trap control: (1) planting corn trap belt around the cotton field, can reduce the number of cotton bollworms in the cotton field spawning and larval occurrence; (2) the field side of the place to place insecticidal lamps, sexual traps, poplar tree branches and food traps to trap adult insects.
3, chemical control: according to the survey, according to the standard prevention and control, choose a good spraying equipment to ensure the quality of prevention and control.
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