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问:鱼塘水面有草,能不能用百草枯除,对鱼有没有害?答:百草枯对鱼毒性低。鱼塘水面大量发生的一年生杂草,可以用百草枯喷雾防除,尽量不将药液直接喷到水里。百草枯为触杀型除草剂,水下根茎发达的杂草不宜用该药除,可以考虑用草甘膦除。百草枯和草甘膦遇土即失去活性,趁水浑的时候用药更安全。问:每亩用25%吡蚜酮30克防治蚜虫效果不太好,用药5天后还有很多虫,这是为什么?答:吡蚜酮对蚜虫、飞虱等刺吸式口器害虫有较好防效,
Q: fish pond water, can not be removed with paraquat, the fish is not harmful? A: Paraquat on fish toxicity is low. Large annual occurrence of fish pond water weeds, paraquat spray can be controlled, try not to spray the liquid directly into the water. Paraquat as contact herbicide, underwater rhizome developed weeds should not be used in addition to the drug, you can consider the addition of glyphosate. Paraquat and glyphosate lose their activity in the face of the earth, while medication is safer while the water is muddy. Q: 25% pymetrozine per acre with 30 grams of aphids control effect is not very good, there are a lot of insects after 5 days of treatment, which is why? A: Pymetrozine on aphids, planthoppers and other sucking mouthparts pests are more Good anti-efficiency,