The effective ingredients of plant-derived insecticides are derived from plants, and have the advantages of being environmentally friendly, generally low in toxicity, and not easy to make pests resistant to pesticides in the control of crop pests. They are the pesticide varieties that should be preferred for the production of pollution-free agricultural products. In order to allow farmers and agricultural technology extension workers to have a more comprehensive and in-depth understanding of plant-derived pesticides, we now summarize and introduce the main plant-derived pesticides developed in my country and their application in crop pest control. as follows.

 1 Common types of plant-derived pesticides

1.1 matrine

Single agent has 0.2%, 0.26%, 0.3%, 0.36%, 0.5% water, 0.3% water emulsion, 0.36%, 0.38%, 1% soluble liquid, 0.3% EC, 0.38%, 1.1% powder; mixed The preparations are 1% matrine·azadirachtin EC, 0.2% matrine aqueous solution 1.8% rotenone EC mixture, 0.5%, 0.6%, 1.1%, 1.2% matrine·nicotine aqueous solution, 0.6% bitter Ginseng·berberine water agent. It can be used for the control of vegetable cutworms, cabbage caterpillars, diamondback moths, aphids, leek and chive maggots, cucumber red spiders, aphids, tea tree caterpillars, tea loopers, tobacco smoke caterpillars, tobacco aphid, wheat, millet Mythimna separata, cotton spider mites, citrus arrowhead scales, pear scab, apple tree spider mites, yellow aphid, ring disease.

1.2 Oxymatrine

The single agent is 0.1% aqueous solution; the mixed formulation has 0.5%, 0.6% oxymatrine·psoralen aqueous agent. It can be used to control flower aphids and vegetable cabbage worms and aphids respectively.

1.3 Nicotine

The single agent is 10% emulsifiable concentrate, and the mixed formulations include 0.84%, 1.3% strychnine·nicotine aqueous solution, 2.7% hyoscyamine·nicotine suspension, 27.5% nicotine·oleic acid emulsifiable concentrate, 10% pyrethrin· Nicotine EC, 9% capsaicin·nicotine microemulsion, 15% ricinoleic acid·nicotine EC. It can be used to control cabbage caterpillars and aphids of cruciferous vegetables, citrus arrowhead scales, wheat aphids, armyworms, apple yellow aphids, cucumber red spiders, aphids, bean aphids, cotton bollworms, aphids, tobacco tobacco worms, mustard greens aphid.

1.4 rotenone

There are 2.5%, 4%, and 7.5% EC for single dose, and 5% pyrethrin·rotenone EC for mixed formulations. It can be used to control vegetable cabbage caterpillars, aphids, diamondback moth, Spodoptera litura, citrus arrowhead scales, cotton bollworm.

1.5 Lavender

The preparation is 0.1% emulsifiable concentrate, which can be used to control Pieris rapae on cruciferous vegetables.

1.6 sanguinarine

It is one of the main active ingredients in the total alkaloids of the extract of the Papaveraceae plant Boluohui. The preparation is 1% sanguinarine wettable powder (5% of the total alkaloids wettable powder). The medicine has certain control effect on the cabbage caterpillar of cruciferous vegetables, bean aphid, apple yellow aphid, two-spotted spider mite, and pear tree louse. The dosage for controlling Pieris rapae and aphids is 30~50g/667m2 of 1% wettable powder. The spraying effect of Pieris rapae in the young larvae stage is the best; the concentration of controlling apple tree aphids, two-spotted spider mites, and pear tree psylla 1500~2500 times liquid, generally spray evenly at the stage of young nymphs of spider mites and psyllids with the best control effect. The quick-acting effect of this medicine is average, usually 3 days after the medicine, the control effect is obviously increased, and the effective period is about 7 days, which is safe for crops.

1.7 Cineole

The preparation is a 5% soluble liquid, which can be used to control cruciferous vegetable aphids.

1.8 Celangulin

Celangulin is an effective ingredient extracted from the root bark and seeds of wild shrubs of the Euonymus family, and the preparation is 1% Celangulin EC. The medicine has strong stomach poisoning, antifeedant, repellent and contact killing effects, and has a good control effect on the cabbage caterpillar of cruciferous vegetables. The dosage of 667m2 is 50~70mL of 1% EC, usually diluted with 60~75kg of water, and spray evenly. The drug has good quick-acting effect, the control effect can reach more than 90% one day after the drug, and the effective period is more than 7 days, which is safe for crops.

1.9 Osthole

Osthole is an effective ingredient extracted from the dried and mature fruit of Cnidium in the Umbelliferae family. The preparation is 0.4% Osthole EC. It mainly has contact killing effect, supplemented by stomach toxic effect, and has good control effect on cruciferous vegetables Pieris rapae and tea looper. The dosage for controlling Pieris rapae 667m2 is 0.4% EC 80~120mL; the dosage for controlling tea tree tea looper is 0.4% EC 100~120mL, mixed with water 50~75kg and sprayed evenly, the effective period is about 7 days, which is safe for crops.

1.10 Veratrine

The preparation is a 0.5% soluble liquid, which can be used to control cotton bollworm, cotton aphid and cruciferous vegetable cabbage caterpillar.

1.11 Neem

The preparation is 0.5% EC, which can be used to control cruciferous vegetable aphids.

1.12 azadirachtin

The preparation is 0.3%, 0.5% EC, which can be used to control Plutella xylostella.

1.13 pyrethrin

The formulation is 5% and 6% EC, which can be used to control cruciferous vegetable aphids.

1.14 anissonin

The formulation is 0.65% aqua, which can be used to control looper, aphids, cabbage caterpillars and aphids.

1.15 Stemonine

The preparation is 1.1% Stemidine·Melidin·Nicotine EC, which can be used to control Liriomyza vulgaris, Green tea leafhopper and cruciferous vegetable aphids, Pieris rapae and Plutella xylostella.

1.16 Cineole

Cineole is the main component of eucalyptus oil. The preparation is a 5% cineole solution. This medicine has a good control effect on cruciferous vegetable aphids. The dosage of 667m2 is 70~100mL of 5% solution, mixed with 75kg of water and sprayed evenly. The effective period is about 7 days, which is safe for crops.