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2012年49 No.6
The relationship between selection and survival of newly-hatchedChilo suppressalis larvae feeding on different varieties of rice
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Key Words：Chilo suppressalis，newl larvae，rice，survival rate，selection
Abstract： The stem borer，Chilo suppressalis Walker is a major rice pest in China and its numbersavebeentrending upward． We found that the survival rate of newly-hatched C． suppressalis larvae was highest onLiangyoupeijiu (60. 8% )，intermediate on Nanjing 11 (45. 8% )，and lowest on Ⅱyou 084 (25. 8% ) ． There was no significant difference in thesurvival rate of larvae feeding on Nanjing 44，Wuyunjing 7Changyou 3，Wuyujing3 and Xiangnuo 8333，althoughsurvival rates were all more than 40. 0% on the first fouvarieties and only 35. 8% in Xiangnuo 8333. Newly-hatchedlarvae displayed clear preferences for the eight varieties of rice． Liangyoupeijiu ( hybrid indica rice ) was the mostpreferred with 21. 0% preference determined by the disk method and ＞ 50. 0% in Y-olfactometer experiments． The leastpreferred was Xiangnuo 8333 (5.6% ) ． Preferences for Nanjing44，Nanjing11 and Changyou 3 were 16. 5% ，15. 5% and13. 5%espectively． Regression analysis indicated that larval survival rates were positivelyon．