| Stem borer [Chilo suppressalis (walker)] is the one of the major insect pests that threat to Asian temperate, subtropical, Australia, southern Europe countries, the United States, Africa (Egypt) and other rice-producing countries. Stem borer is widely distributed in China, heavy damage. the strategy that prevent the stem borer is adopted by"suppress the insect source, force to avoid borer damage, focusing on drugs" as the strategic thinking.it should be based on agriculture in the fight against technology-based prevention and treatment, coordinating the use of resistant varieties, biological control, etc., chemical control method has an irreplaceable position in IPM,5 Gao methamidophos, organophosphorus pesticide poisoning pesticide production and use in China, occupied about 70% rate, widely used in rice, cotton, pest controlit cause all sorts of adverse effects for people's irrational use of pesticides it plays an important role in agricultural production, these pesticides bound to bring pesticide supply gap, to the major impact of agricultural production.in 2007.The experiment used Bioassay method to study the toxicity of 8 moderate activity of these insecticides on the rice stem borer, measure determination of six kinds of mixtures joint toxicity. Laboratory bioassay showed that chlorpyrifos, cyfluthrin and permethrin efficient, fipronil, chlorfluazuron, dichlorvos, avermectin against rice stem borer has high biological activity; acephate LC50 value of the SSB than 400mg/L, tested borer has generated low-level resistance to acephate.Mixture field efficacy trials show that 25% Triazophos·toxic water emulsion and 25% Triazo phos·Chlorpyrifos EW against rice stem borer showed good insecticidal effect, with a single dose were obvious synergies effect. Of which 25% Triazophos·toxic water emulsion have the best control effect for the 262.5g/hm2. The water emulsion has a market potential.Seed Treatment with 50 g/L fipronil suspension primed to scab in crude rice seed coating treatment, use active ingredient per kg seed 0.75-1 g, can control seedling pests damage, the application of the Rice Stem Borer control effect is still 87.6% after 38 days 10% of the new pesticide fipronil double amide. Avermectin SC ai 60g/hm2,24% fipronil double amide WG ai 30g/hm2 can control of rice stem borer, drug efficacy was 93.7 after 20 days%,89.4%, higher than triazophos, avermectin and other agents.controling pesticides for of rice stem borer detoxification coefficients showed that fipronil double amide, chlorfenapyr detoxification factor decreased more than 99%, as the ideal alternative to toxic pesticides pharmaceutical Gao; acephate, fipronil, chlorpyrifos, triazophos, avermectin such as detoxification coefficient decreased by 90%-99%, can be used as the Control of Rice Stem Borer Gao alternative varieties of poisonous pesticides applied in production. |
