Helicoverpa armigera occurs in the middle and late stages of cotton growth, mainly affecting the reproductive organs of cotton by larvae, causing a large number of buds, flowers, and bells to fall off and rotten bells.
Pesticides used in place of the current Ministry of Agriculture recommended HTPs cotton bollworm has indoxacarb, emamectin benzoate and lambda cyhalothrin. In addition, 37.5% thiodicarb, 2.5% spinosyn, 10% methoxyfenozide, 5% hexaflumuron, 1% methyl avermectin, etc. as a substitute for highly toxic pesticides to control cotton bollworm are further In the pilot demonstration. Methyl avermectin, beta-cypermethrin, and hexaflumuron have been used in a large area of ​​production. Emamectin benzoate has been introduced in this series, indoxacarb, thiodicarb, The application of spinosad and methoxyfenozide is not too much. Now we will focus on the characteristics and application techniques of the latter pesticides.
1. Indoxacarb: The mechanism of action is to block the sodium channel in the insect nerve cells, resulting in poor coordination of the target pests, paralysis, and ultimately death. The agent enters the worm by contact and ingestion, allowing the pest to quickly stop feeding, thereby protecting the target crop. This medicine has no cross-resistance with other insecticides. At present, 15% of indoxacarb suspension (ampaze) produced by DuPont (Telephone) and 30% of indoxacarb dispersible granules are produced in China, and 15% of the production of Shanghai Nonle Biological Products Co., Ltd. (telephone) Insect Suspension (Ata), 30% of indigo water dispersible granules produced by Jiangmen Daguangming Agrochemical Co., Ltd. (Telephone), Guangdong Province. Control cotton bollworm, mastered with 15% indoxacarb suspension or 30% indoxavir dispersible granules 40 mg / liter solution spray during the egg incubation period.
2, thiodicarb: the mechanism of action is to inhibit the cholinesterase in insects, so that insects die. But this is a reversible inhibition, if the insects die without poisoning, the inhibited cholinesterase can be restored. This medicine cannot be mixed with alkaline and strong acid pesticides, nor can it be mixed with sensitized zinc or mancozeb. 37.5% thiodicarb (Tianyou) is a product of Dongguan Ruidefeng Biotechnology Co., Ltd. (telephone) in Guangdong Province. Control cotton bollworm, spray with 37.5% thiodicarb suspension 500-625 mg / liter solution.
3, spinosad: 2.5% spinosad (Xi Xi) is a biochemical pesticide, produced exclusively by Dow AgroSciences. The drug is low in toxicity and has a safe interval of 1 day. It has quick effect and is effective on the day after spraying. The half-life is short, easy to degrade, and safe for natural enemies. It is mainly used to control pests such as Plutella xylostella, beet armyworm and thrips. Control cotton bollworm, spray with 2.5% spinosyn 25-35 mg / liter solution.
4, methoxy hydrazide: a low-toxic dihydrazide insecticide, is a non-sterol structure of ecdysone, can promote the Lepidoptera larvae into the molting process before the maturity can not form a new epidermis, leading to early larval larvae Feeding and eventually dying. The speed of action is fast. Generally, the larvae stop feeding after 4-16 hours of feeding, and symptoms of poisoning appear. The cotton bollworm was controlled and sprayed with a solution of 10% methoxyfenozide 320-600 mg/L.
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