Issue:ISSN 2095-1353
CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
Address:Chaoyang District No. 1 Beichen West Road, No. 5 hospital,Beijing City,100101, China
Tel:+86-10-64807137
Fax:+86-10-64807137
Email:entom@ioz.ac.cn
Your Position ：
Home->Past Journals Catalog->
2012年49 No.6
Selection of Spodoptera exigua for tebufenozide resitanceand relative fitness of the resultant resistant strain
Author of the article:
Author's Workplace：
Key Words：Spodoptera exigua，tebufenozide，resistance，relative fitness
Abstract： A Wuhan-susceptible strain of Spodoptera exigua ( Hübner) was selected for in the laboratory through 12generations of selective breeding，using mass selection，alternating with single selection in the 9th，10th and 12thgenerations． We found that survival rates of S． exigua larvae from different single pair families after treatment withtebufenozide were significantly different． Average survival rates were 48. 34% ，11. 72% ，2. 37% respectively in F9( s1)，F10( s2) and F12( s3)，compared with 84. 00% ，83. 33% and 7. 29% respectively in selected single pair families． Afterselection for 12 generations by mass and single selection，the selected strain showed a 5. 24-fold increase in resistance totebufenozide compared with the susceptible strain． Resistance of single selected generations increased faster than that of mass selected generations，the increases of the former being 1. 27，1. 67，1. 38 times，respectively，that of the latter． Incomparisons of some biological parameters between mass and single selected generations of S． exigua，the single selected generations did not display developmental or reproductive disadvantages． The speed of development of resistance selection was increased by alternating a few generations of single pair selection in the mass-selected population． The selected strain had a fitness of 0. 31 relative to the susceptible strain． This indicates that the development of tebufenozide-resistance in S．exigua has a fitness cost．