四种生物农药及其与二种化学农药混配对稻飞虱混合种群的防治效果

试验以喷雾法研究4种生物农药及其与2种化学农药组合混用对水稻褐飞虱Nilaparvata lugens(Stal)和白背飞虱Sogatella furcifera(Horvath)混合种群的防治效果。结果表明:0.36%苦参碱AS、0.5%藜芦碱WP、1.8%阿维菌素EC、400亿孢子/克白僵菌WP,分别以1500mL/hm2、3000g/hm2、900mL/hm2、1800g/hm2的制剂用量单独使用,只有阿维菌素效果较好,药后7、14d的防效分别达到了73.3%和82.3%,但与对照药剂48%毒死蜱EC1500mL/hm2和25%噻嗪酮WP750g/hm2的防效差异极显著。而4种生物农药与2种化学农药分别以单用剂量减半混合使用的8个处理中,①苦参碱+毒死蜱、②藜芦碱+毒死蜱、③阿维菌素+毒死蜱、④球孢白僵菌+毒死蜱、⑤苦参碱+噻嗪酮、⑥藜芦碱+噻嗪酮6种组配,药后1d的校正防效为81.8%～89.2%,3d为88.2%～96.5%,7d为95.6%～98.1%,14d为86.0%～97.8%。因此,以上生物农药与化学农药的6种组合混用可以有效防治稻飞虱低龄若虫。

Control effects of four biological pesticides and two chemical pesticides and their mixtures against mixed population of Nilaparvata lugens and Sogatella furcifera

The effectiveness of four biological and two man-made pesticides,and mixtures of these compounds, in controlling sympatric populations of Nilaparvata lugens （Stl） and Sogatella furcifera （Horvath）,was tested in rice fields. The results show that,of four biological pesticides tested; matrine （ 0. 36% AS 1 500 mL / hm^2 ）,veratridine （0. 5% WP 3 000 g /hm^2 ）,abamectin （1. 8% EC 900 mL / hm^2 ） and Beauveria bassiana （4. 0 × 10^10 spores/ g WP 1 800 g/ hm^2）,abamectin was the most effective with control efficiencies 7 and 14 days after spraying of 73. 3% and 82. 3% respectively. These results were significantly higher than those achieved by the man-made pesticides; chlorpyrifos （48% EC at 1 500 mL / hm^2 ） and buprofezin （25% WP at 750 g / hm^2 ）. The control efficiencies of six combinations of the above biological and chemical pesticides; ① matrine ＋ chlorpyrifos,② veratridine ＋ chlorpyrifos,③ avermectin ＋ chlorpyrifos,④ Beauveria bassiana ＋ chlorpyrifos,⑤ matrine ＋ buprofezin,⑥ veratridine ＋ buprofezin,were 81. 8% - 89. 2% ,88. 2% - 96. 5% ,95. 6% - 98. 1% ,and 86. 0% - 97. 8% ,respectively,1,3,7 and 14 days after application. We conclude that these combinations of biological and man-made pesticides and dosages are more effective their constituents for controlling younger nymphs of N. lugens and S. furcifera.