Rice stem borer is the main pest in rice production. In recent years, the population is large and the damage is serious. Some pesticides used for a longer period of time, such as insecticidal, insecticidal, triazophos, etc., show different degrees of resistance in different regions. In recent years, a number of low- and low-toxic pesticides or compound pesticides have been recommended to replace high-toxic pesticides. In order to verify the control effect of these pesticides on Chilo suppressalis, the China National Rice Research Institute applied a number of commonly used pesticides on early rice in 2002 and 2003. A comparative test was conducted on the stem borer. The test was set up in the early rice paddy field of the China National Rice Research Institute (Zhejiang, Fuyang), which belongs to Pingba District, self-flow irrigation, and the soil is clay loam. The area of ​​the plot is 20 m2, and the plots are separated by mud, and each pesticide is set to repeat 2 to 3 times. The early rice variety was Zhongyou No. 1, sowing on March 30, transplanting on April 22, using herbicide once every 7 days after transplanting, and applying 30 kg of urea for 7 and 14 days. No insecticide or fungicide was applied. The date of application was May 23, and the rice was in the stage of tillering and jointing, which was the peak period of the first generation of the stem of the stem borer. Test results: 50% Regent 40g/mu, 24% 螨20g/mu, 20% triazophos 100ml/mu, 50% 稻丰散100ml/mu, 45% chlorpyrifos 100ml/mu, 40% Propropyl bromide 100ml/mu, 25% acephate 150ml/mu, 50% diazinon 100ml/mu, 20% sulphur 100ml/mu, 0.6% Avi 50ml/mu, 50% acesulfame 100ml/mu 5% card death special 100ml/mu, 10% triflumuron 30ml/mu, 5% hexaflumuron 50ml/mu, 93.8% insecticidal single original powder 40g/mu, 4 days after treatment, relative larvae reduction The rates were 76.4%, 76.4%, 77.0%, 61.7%, 82.4%, 64.7%, 47.1%, 82.4%, 5.6%, 73.5%, 55.9%, 28.0%, 0, 61.4%, 59.1%, respectively. For 24 days, the relative control effects were 95.8%, 89.0%, 84.7%, 48.6%, 51.0%, 47.7%, 28.6%, 58.2%, 10.7%, 66.1%, 54.7%, 17.0%, 77.6%, 52.7%, respectively. 52.0%. Among them, 5% hexaflumuron 50ml/mu and 93.8% insecticidal single original powder 40g/mu were treated in another early rice field. From the test results of the above 15 kinds of test pesticides, it can be seen that: 1. Only 5% of the control effect is more than 90% of Ruijinte 40g/mu; the control effect is 80%~89% of only two kinds of pesticides, namely 24%螨20g/mu and 20% triazophos 100g/mu (Zhejiang Xinnong production); control effect is 70%～79%, namely 10% killing urea 30ml/mu; control effect is 60%～69% There is a kind of 0.6% avermectin 50ml/mu; the other pesticides have the control effect below 60%, including the widely used insecticides, rice flour, diazinon, acephate and so on. 2. From the larval reduction rate of 4 days after drug administration, there are two kinds of pesticides with a relative reduction rate of larvae above 80%, namely 45% chlorpyrifos 100ml/mu and 50% diazinon 100ml/mu. The late control effect is poor, which may be due to the short duration of effect. 3. In 2002, pesticides such as dimethoate, insecticidal, chlorpyrifos, pyrimidine and other pesticides were also tested in the field, and the control effects were all below 80%. The data were not included. From the current domestic promotion and use of a number of pesticides (single dose and compounding agent) in addition to the control of the sputum in addition to Rui Jin special, the United States Dow production of the United States is also a good pesticide variety, the use of 30g anti-effect will be better However, the price is too high (330,000 yuan / ton). The effect of triazophos in the general area (except for high-resistance areas) is acceptable, but we have a large difference in the control effect of 20% of triazophos emulsifiable concentrates used in different triazophos producers (60%-80%). Is the difference in content? Or impurity content, emulsified variety, etc., without further analysis. From the perspective of compounding, the compounding agent of Ruijinte has good control effect; the control effect of avermectin and triazophos is generally about 85%; the combination of acesulfame and triazophos The control effect of the agent can reach 85% to 90%, but the sulphate is a highly toxic pesticide species banned in the country. The control effects of rice flour, diphosphorus, chlorpyrifos, dimethoate, etc., which are combined with triazophos and avermectin, which are promoted by many pesticide manufacturers in China, are all below 85%. The reason for the increase of the population of Chilo suppressalis is multi-faceted comprehensive performance, such as widespread winter insect sources (more winter idle fields, low utilization rate of straw, etc.); the wintering period occurs for a long period of time, the field medicaments only prevent once, and a large number of insect sources are transferred. The second generation; generally the second or third generation does not prevent or prevent improperly caused a large number of insect-injured strains; the general control effect of pesticides is poor, and it is also one of the factors that increase the pest population.

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