Acta Entomologica Sinica (1998) 41, S42-S48

Qingjun Wu, Guoren Zhu, Jianzhou Zhao, Xing Zhang and Xiwu Gao (1998)
[Studies on biochemical mechanisms of chlorfluazuron resistance in diamondback moth, Plutella xylostella (L.)]
Acta Entomologica Sinica 41 (Suppl.), S42-S48
Abstract: The mechanisms of chlorfluazuron resistance in the diamondback moth (DBM) (Plutella xylostella L.) were investigated in a chlorfluazuron-selected strain (CH-R) and a field population collected from Shanghai (SH-R) in October 1996, with 9.16-folds resistance to chlorfluazuron. The results showed that: (1 ) The activities of MFO in O-demethylation increased 2. 00 and 1. 08-folds in CH-R and SH-R strains, respectively, compared with the SZ-S strain. (2) There were differences in quality and quantity of CarE between CH-R and SZ-S strains. The K_m value of CH-R strain was 20.46 times lower than that of the SZ-S strain, suggesting that the property of CarE in CH-R strain was altered. Butt there was no significant difference between SH-R and SZ-S strains in K_m and V_max values. (3) Difference of phosphatase activities between SZ-S and CH-R or SH-R strains was not significant. (4) The activities of cuticle chitinase and phenol oxidase were decreased by 48% and 60%, respectively, compared with the SZ-S strain.
(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)