桔小实蝇对敌百虫抗性稳定性及再增长趋势

摘要/Abstract

摘要： 通过室内试验，研究了用LC₅₀及LC₉₀两种浓度敌百虫汰选14代建立的不同程度高抗性水平的桔小实蝇Bactrocera dorsalis抗性品系TrR₅₀和TrR₉₀在停止使用药剂后的抗性衰退规律，以及抗性衰退到原有水平的1/3时再用药汰选的抗性再增长规律。结果表明：两抗性品系对敌百虫抗性均不稳定，但抗性衰退速率不同，TrR₉₀完全隔离药剂4代后，抗性已衰退至原有水平的1/3，而TrR₅₀完全隔离药剂7代后，抗性才衰退至原有水平的1/3，但随后两品系抗性衰退均减缓，到19代后抗性均还处于低水平抗性阶段，无法衰退至敏感水平。通过对其抗性衰退趋势进行方程拟合，结果表明两品系抗性衰退均符合S型曲线模型。抗性再增长试验结果表明：桔小实蝇两抗性品系对敌百虫抗性再增长趋势不同，TrR₅₀继续使用药剂汰选，经过6代选育，抗性迅速上升，接近原有的抗性水平，随后保持平稳增长；而TrR₉₀继续使用药剂汰选，经过9代选育，抗性才迅速上升，经过12代选育，抗性才接近原有的抗性水平。通过对两品系抗性再增长趋势进行方程拟合，结果表明两品系抗性再增长趋势不同，TrR₅₀品系抗性再增长趋势符合逻辑斯蒂模型，而TrR₉₀品系则符合二次曲线模型。

关键词: 桔小实蝇, 敌百虫, 抗药性, 抗性稳定性, 抗性再增长

Abstract:

In the laboratory, two different high-level resistant strains TrR₅₀ and TrR₉₀ of the oriental fruit fly, Bactrocera dorsalis to trichlorphon were established after 14 generation selection by using the concentrations of LC₅₀ and LC₉₀ of trichlorphon, the TrR₅₀ and TrR₉₀ strains without exposure to any insecticides were kept for 19 generations, and the resistance recession to trichlorphon were studied. At the same time, the re-growth resistance was monitored after the two strains were bred for 4 generations under insecticide-free condition, and then selected with trichlorphon for 12 generations. The results showed that the resistance of the two resistant strains was all instable, but their depression rates were different. After Tr90 and TrR50 were selected for 4 and 7 generations respectively, their resistance decreased to one third of the original level. Then the resistance of the two strains was depressed slowly, and after the two strains were selected for 19 generations, their resistance kept at a low level but was unable to be depressed to the susceptible level. Through equation fitting of resistance depression tendency, it was found that the resistance depression of the two strains was both in line with S-curve model. The resistance re-growth of the two strains was different. After selection with trichlorphon for 6 generations, TrR₅₀ resistance went up rapidly which was close to the original level; but only after selection for 9 generations with trichlorphon,

TrR₉₀ resistance began to increase rapidly, which was close to the original level only after 12 generation selection. The results of the equation fitting of resistance re-growth tendency showed that resistance re-growth of the two strains was quite different, and the fitting curve of TrR₅₀ strain was in line with the logistic model, while that of TrR₉₀ was in line with quadratic curve model.

Key words: Bactrocera dorsalis, trichlorphon, insecticide resistance, resistance stability, resistance re-growth

章玉苹，曾玲，陆永跃，梁广文. 桔小实蝇对敌百虫抗性稳定性及再增长趋势[J]. , 2008, 51(10): 1044-1049.

ZHANG Yu-Ping. Resistance stability and re-growth in adults of the oriental fruit fly, Bactrocera dorsalis (Diptera: Tephritidae) to trichlorphon[J]. , 2008, 51(10): 1044-1049.

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桔小实蝇对敌百虫抗性稳定性及再增长趋势

Resistance stability and re-growth in adults of the oriental fruit fly, Bactrocera dorsalis (Diptera: Tephritidae) to trichlorphon

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