| The brown planthopper(hereinafter called BPH), Nilaparvata lugens(stal) is one of the most important pests on rice. In recent years, population of this pest and its damage to rice increased dramatically in our country, and became a serious threat for rice.In this research the effect of 6 insectisides and half of them that were mixed against Nilaparvata lugens was evaluated by rice stem dipping method; The resistance of 33 rice varieties(lines) to BPH were measured by the following methods:seedling screening test, honeydew production of females and population dynamics of N. lugens in paddy field and yield evaluation; The effect of Control to BPH and rice yield of a suit of integrated pest management was discussed. The results were as follow:1. Contact toxicity of 6 insectisides against BPH:48% lorsban EC> 5% regent SC> 2% abamectin EC> 25% thiamethoxam WDG> 25% buprofezin WP> 10% imidacloprid WP. At the dose of 0.2g/l,0.167g/l, the corrected mortality rate to third instar nymphaes of BPH caused by 48% lorsban EC was 96.7% and 90.0% within 24h respectively, and it increased to 100% within 48h. At the dose of 1.0g/l,0.4g/l, the corrected mortality rate to third instar nymphaes of BPH caused by 5% regent SC and 2% abamectin EC was 98.1% and 98.0% within 72h respectively. At the dose of 0.125g/l, the corrected mortality rate to third instar nymphaes of BPH caused by 25% thiamethoxam WDG was 92.6% within 72h. Half of these insecticides that were mixed had better effect than one pestiside used alone. The corrected mortality rate to third instar nymphaes of BPH caused by 48% lorsban EC and 5% regent SC,48% lorsban EC and 2% abamectin EC was about 95% within 24h, and it increased to 100% within 48h. The corrected mortality rate to third instar nymphaes of BPH caused by 5% regent SC and 2% abamectin EC was also 100% within 48h.2. Resistance of rice varieties(lines) to BPH. During 2008, Huhan1A/07WH14 62, Huanxiang29A/07WH644, Chuangxiang29A/07WH1462 were resistant to BPH, Zhong9A/07WH1462, HuhanlA/07WH644, Zhong9A/07WH644 were moderate resis tant to BPH. Both the major cultivar of Hubei province, Luohong3A/610234 and Liangyoupeijiu were susceptible to BPH. Under the condition of no pesticide appli cation in whole growing season, the yield of Zhong9A/07WH1462 was the highest, and it was 14.8% higher than Liangyoupeijiu. During 2009, ten lines including Zh ong9A/07WH1462, Hua1517A/08HN2003, Hua 1971A/08HN2009, Hua 2048A/08H N2002, Hua 1517A/08HN2002, Hua 1517A/08HN2001, Hua 1971A/08HN2003, Hu a 1971A/08HN2002, Hua 2048A/08HN2001, Hua 2048A/08HN2003 were resistant to BPH, and eight varieties(lines) such as Jingxian89, Guangliangyou476, Hua1971 A/08HN2001, Hua2048A/08HN2005, Hua2048A/08HN2009, Yuxiangyouzhan, Hua20 48A/08HN2004, Zhongzu14 were moderate resistant to BPH. Among those varietie s(lines) resistant or moderate resistant to BPH, the yield of Hua1971A/08HN2001 and Hua2048A/08HN2004 was higher than 500kg/667m2, and they were 23.0%,20. 3% higher than Liangyoupeijiu respectively.3. A suit of pest management measures containing insect-resistance variety, different nitrogen regimes, sunning the field, natural enemies protection were integrated to control BPH. BPH population was significantly depressed by these measures. Comparing with the control field, the aboundance of parasitoids and predators increased to 5.64%, aboundance of phytophages decreased to 58.32% in rice field appling integrated control measures, and the aboundance of neutral insects also increased. So the arthropod community in the treatment rice paddy was further optimized, it was favorable for the sustaining management of insect pest in rice paddy. The yield of rice in in rice field appling integrated control measures was 513.918kg/667 m2, it was 14.8% significantly higher than that in control rice field which was only 457.769kg/667 m2. |
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