Commonly used plant-derived insecticides and their application techniques

1. Nicotine

Nicotine is a highly volatile neurotoxic insecticide, and its target is the nicotinic acetylcholine receptor on the postsynaptic membrane. The mechanism of action on insects is mainly fumigation, touch, stomach poison and inhibition of growth and development, and has a certain ovicidal activity.

Nicotine can be used to prevent and control aphids, mesquite, leaf miner, thrips, stinkbugs, leafrollers, cabbage greenfly, stem borer, leafhoppers, cabbage butterfly larvae, etc. It can also be used to carry out prevention and control of rice fly and red spider on cotton and citrus.

In the production process, free nicotine can be extracted from the waste such as tobacco stems, tobacco tendons and tobacco powder through appropriate processes.RAMBO insect killer supplier Free nicotine is mainly used for contact killing and fumigation, and the salt-forming products are mainly used for contact killing and stomach poisoning.

2. Pyrethrin

Pyrethrin is the extract of natural pyrethrum flowers, unstable and easy to decompose. Almost insoluble in water, soluble in organic solvents. It is a neurotoxic agent, contact killing effect is mainly. It has a wide insecticidal spectrum, with a strong killing effect on aphids on cruciferous vegetables and household hygiene pests such as cockroaches, mosquitoes and houseflies. Its preparations include 0.5% pyrethrin insecticide aerosol and 5% pyrethrin emulsion.

In production, pyrethrin can be directly processed into powder, or pyrethrin can be extracted and processed into emulsifiable oil, aerosol or mosquito incense. Due to the poor light stability of the API, the field application time after storage is shorter, so it is more suitable for the control of grain storage pests and sanitary pests.

3. Diosbulbin

Fisetanone is a broad-spectrum insecticide, which can directly invade insects through their epidermis, valve and digestive tract, with poisoning effects of touch and stomach.VITFE insect killer manufacturer Pest poisoning symptoms quickly, but the death process is very slow, often need a few days to die.

Fisetinone has a wide insecticidal spectrum and is effective against many different pests such as Hymenoptera, Lepidoptera, Diptera, Coleoptera, Hemiptera, Tassel-winged, and Tick suborder. Mainly can be used in the study of fruit trees, vegetables, flowers, tea trees and other crops, control to provide a variety of effects aphids, mites, thrips, melon fly, oblique night moth, kale night moth, yellow-striped flea beetle, yellow ninggua, twenty-eight star ladybug beetle, tea geometrid, tea caterpillar, etc., but also can be used in the biological control of environmental hygiene, as well as pests, such as fleas, lice, mosquitoes, flies and so on. Control with 2.5% rotenone emulsion 400-500 times liquid spray.

4. Neem

Azadirachtin is found throughout the entire plant, but neem has the highest content in the seed kernel.Chinese SLEEP COOL Insecticide spray It has a wide range of insecticidal ability and can be used to control a wide range of pests such as aphids, thrips, mesquite, whiteflies, and chironomid moths on food crops, greenhouse crops, ornamentals, and lawns.

Neem acts in three ways: firstly, it interferes with the normal behavior of insects, showing a variety of functions such as food repellency, repellent avoidance, egg laying and sterilization; secondly, it inhibits the growth and development of insects; and thirdly, it is a toxic effect, which is manifested as contact toxicity, gastrotoxicity and systemic activity. Neem is currently recognized as the most active food repellent in the world. Lepidoptera insects are most sensitive to neem, Hemiptera, Coleoptera and Homoptera are relatively insensitive, and Orthoptera sensitivity varies widely.

Neem formulations include 3% neem emulsion and 0.3% neem emulsion. It is unstable under light and tends to lose its insecticidal activity. To control grain storage pests, neem oil can be mixed well at the rate of 5 mlu002Fkg of grain, or treating sacks with neem preparations can prevent pests from entering the sacks.0.3% neem EC 2.7 ~ 4.05 gu002Fhm2 can be used to control the small cabbage moth of cruciferous vegetables by spraying with water.

5. Veratine

Veratine is a general term for a series of alkaloids with contact-killing and gastrotoxic effects on insects. Vitamin A is found in plants of the genera Resveratrol and Sneezewort in the family Liliaceae.As an insecticide, the plant material is mainly seeds of Sneezewort and rhizomes of Resveratrol. The main method of preparation of the invention is: addition of 0.5% alcohol solution and 5% -20% powder. It can be used to control hygienic pests such as houseflies and lice, as well as agricultural pests such as beetles, aphids, leafhoppers, thrips and bedbugs.

The insecticidal activity of veratrine preparations can be rapidly developed and reduced in sunlight and air, and the holding period in the field is generally short. Prevention and control of research vegetables as well as aphids, in the aphids mainly for the early stage of social damage with 0.5% veratridine alcohol solution 400 ~ 600 times solution evenly for spraying; prevention and control of cabbage greenfly, low larvae at this stage of the safety of the drug is appropriate, can be used in 0.5% veratridine alcohol solution 500 ~ 800 times solution evenly through the spray.

6. Picrasidine

Picrasidine is mainly found in the roots of the leguminous plant Picrospermum sativum. Picrasidine mainly acts on the nervous system of insects, which can cause central nervous system paralysis, and then inhibit the respiration of insects, so that the pests suffocate and die. It has low toxicity to human and animal, broad spectrum of insecticide, and has good control effect on aphids, cabbage greenfly, red spider and other crop pests.

Picrasidine is the most registered active ingredient of insecticidal plant origin. There are single agent and mixing agent, which are divided into Picrasidine water, emulsion, powder and soluble liquid.

Picrasidine is processed from the extract of Ginseng and contains a series of alkaloids. For the control of cabbage butterfly and stick insects, 1% Picrasidine solution (750-1050 ml/hm2) was sprayed with water, and 1% Picrasidine solution (1050-2250 ml/hm2) was sprayed with water to control red spider of cotton and red spider of apple.