Steel Cnc Machined Components,Cnc Steel Parts,Stainless Steel Machining Parts,Cnc Stainless Steel Parts Stand Dragon Industrial Co., Ltd. , https://www.standdragontw.com
New plant-derived pesticides are mostly used for fruits and vegetables
Botanical pesticides represent a significant category within the broader field of biological pesticides. These are derived from natural plant sources and are widely used in the production of pesticide-free agricultural products due to their eco-friendly nature. One such example is celangulin, which is extracted from the root bark and seeds of Euonymus species, a wild shrub. The product is available as a 1% emulsifiable concentrate. Celangulin exhibits strong stomach toxicity, antifeedant, repellent, and contact killing properties, making it highly effective against the cabbage caterpillar, a common pest on cruciferous vegetables. For application, it is recommended to use 50–70 ml per 667 square meters, diluted with 60–75 kg of water and evenly sprayed. This pesticide acts quickly, achieving over 90% control within one day and maintaining effectiveness for more than seven days, while being safe for crops.
Another botanical pesticide is osthole, an active compound extracted from the mature fruits of the umbelliferous plant *Seseli tschiliense*. It is formulated as a 0.4% emulsifiable concentrate and primarily works through contact toxicity, with some stomach activity. It is effective against the cabbage caterpillar and tea leafhoppers. For cruciferous vegetables, the recommended dosage is 80–120 ml per 667 square meters, mixed with 50–75 kg of water. For tea plants, 100–120 ml is used. Application should be done every 7 days, ensuring even coverage and crop safety.
Eucalyptus oil, specifically its main component, is another botanical pesticide. It is available as a 5% solution and is effective against aphids on cruciferous vegetables. The recommended dose is 70–100 ml per 667 square meters, diluted with 75 kg of water and sprayed evenly. Its effect lasts about seven days, and it is considered safe for crops.
Lastly, bloodroot alkaloid, derived from the Papaveraceae family, is another key botanical compound. Available as a 1% wettable powder, it has moderate efficacy against pests such as the cabbage caterpillar, cardamom pests, apple scab, two-spotted spider mites, and pear hibiscus. According to the China Pesticide Network, for cruciferous vegetables and kidney bean aphids, 30–50 grams per 667 square meters is advised, with best results when applied during the early larval stage of the cabbage caterpillar. For apple aphids, two-spotted spider mites, and pear hibiscus, a dilution ratio of 1500–2500 times is recommended. Spraying should be done during the nymphal stage for optimal results. The pesticide shows quick action, with noticeable improvement in control after three days, and remains effective for up to seven days, ensuring crop safety.