Plant-derived pesticides refer to pesticides whose active ingredients originate from plants, and are biological pesticides that replace chemical pesticides . The production of pollution-free agricultural products should be preferred.
Osthole-osthole is an active ingredient obtained from the mature fruit snake bed of Umbelliferae. The preparation is 0.4% osthole emulsifiable concentrate. It is mainly based on contact toxicity, supplemented by stomach toxicity, and has good control effect on cruciferous vegetable cabbage caterpillar and tea tree tea. The dosage of the control cruciferous vegetable cabbage caterpillar is 0.4% milk 667 square meters 80-120 ml; the control tea tree tea ruler dosage is 0.4% milk oil 100-120 ml. Usually 50-75 kg of diluted liquid per 667 square meters, evenly sprayed, effective period of about 7 days, for crop safety. The celangulin-celanocetin is obtained from the root bark and seeds of the wild shrub plant of the genus Euonymus, and the preparation is 1% celangulin emulsifiable concentrate. The pesticide has strong stomach toxicity, antifeedant, repellent, and contact killing effects, and has good control effect on the cruciferous vegetable cabbage caterpillar. Use a dose of 667 square meters 1% emulsifiable oil 50-70 ml, usually diluted with water 60-75 kg, evenly sprayed. The drug has good quick-acting effect, and the control effect can reach more than 90% one day after the drug, and the effect period is more than 7 days, which is safe for crops. Blood root alkaloids - Blood root alkaloids are one of the main active ingredients in the total alkaloids of the Papaveraceae plant. The preparation is 1% of the blood root alkali WP (5%) Wettable powder). The medicine has certain control effect on the cruciferous vegetable cabbage caterpillar, the cardamom, the apple jaundice, the two-spotted spider mites, and the pear tree hibiscus. The control of cruciferous vegetables, cabbage caterpillars and kidney bean aphids, is 1% wettable powder 667 square meters 30-50 grams, and the best effect of spraying cabbage caterpillars in the young larvae is to control apple locusts and two-spotted spider mites. Pear tree and pear hibiscus use 1% wettable powder, the dilution ratio is 1500-2500 times, and it is usually best sprayed evenly in the young nymphal stage of spider mites and pear hibiscus. The quick-acting effect of the drug is usually obvious, and the control effect is obviously increased 3 days after the drug, and the effect period is about 7 days, which is safe for crops. Eucalyptin-eucalyptus is the main component of eucalyptus oil. The preparation is 5% eucalyptus solution, which has good control effect on cruciferous vegetable aphids. China's pesticide network recommends using a dose of 5% solution 667 square meters 70-100 ml, 75 kg water, even spray, effective period of about 7 days, for crop safety.
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