Acta Entomologica Sinica (1998) 41, S34-S41

Qingjun Wu, Guoren Zhu, Jianzhou Zhao, Xing Zhang and Xiwu Gao (1998)
[Resistance selection of Plutella xylostella (L.) by chlorfluazuron and patterns of cross-resistance]
Acta Entomologica Sinica 41 (Suppl.), S34-S41
Abstract: The resistance selection and patterns of cross-resistance of diamondback moth (DBM), Plutella xylostella (L. ), to chlorfluazuron, a benzoylphenylurea (BPU) insect growth regulator (IGR) that interferes with chitin synthesis, were investigated during 1995~1996. Laboratory selection of a Shenzhen strain (SZ-S) of DBM, having been reared in the laboratory for 6 years since its collection in 1990, by chlorfluazuron for 6 generations resulted in 23.78-fold resistance to chlorfluazuron, and quick reversion to susceptibility was observed when the culture was kept without exposure to the chemical pressure. Cross-resistance to conventional insecticides cyhalothrin, cypermethrin, phoxim, quinalphos, methomyl, microbial insecticide Bt, abamectin and diafenthiuron was not apparent. Negative cross-resistance was demonstrated to two nereistoxin derivatives, cartap (0.21) and shachongdan (0.23).
The results of in vivo tests showed that addition of PBO or TPP had no effect on the toxicity of chlorfluazuron in the SZ-S strain, while PBO or TPP significantly increased the toxicity of chlorfluazuron in both SH-R and CH-R strains, with synergism ratios ranged from 15.42 to 29.71-fold and 2.74 to 2.87-fold based on comparison of LC₅₀ and PBO restored the effectiveness of chlorfluazuron completely, indicating that MFO is the major resistance mechanism.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Xi-Wu Gao, Qing Jun Wu

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plutella xylostella		China (south)