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Sun D.,Key Laboratory of Natural Pesticide and Chemical Biology | Li L.,CAS Institute of Zoology | Liang H.,CAS Institute of Zoology | Li W.,CAS Institute of Zoology | And 3 more authors.
Environmental Monitoring and Assessment | Year: 2012

The dissipation of ethofenprox in cabbage and soil under open conditions was investigated at two primary cabbage-growing regions, Beijing and Kunming in China. Samples were extracted with acetonitrile and determined by ultra-performance liquid chromatography with a single quadrupole detector. Dissipation of ethofenprox from cabbage and soil can be best explained by a first-order decay process. The half-lives of ethofenprox were 1.9 and 2.3 days in cabbage and 20.0 and 13.0 days in soil at Beijing and Kunming, respectively. The concentration of ethofenprox residue was reduced by 90% taking 7 and 60 days in cabbage and soil. Dissipation rates in cabbage and soil at two geographically separated experimental fields differed, suggesting that this was affected by complicated factors, such as local climate and soil characteristics. These data could provide guidance for the proper and safe use of this pesticide on cabbage in China. © Springer Science+Business Media B.V. 2011. Source

Zhou L.,Key Laboratory of Natural Pesticide and Chemical Biology | Huang J.,Key Laboratory of Natural Pesticide and Chemical Biology | Xu H.,Key Laboratory of Natural Pesticide and Chemical Biology
Crop Protection | Year: 2011

Diamondback moth Plutella xylostella (L.) is a cosmopolitan pest of crucifers and it is particularly notorious for its resistance to commonly used insecticides. To provide a basis for future resistance management strategies, this study evaluated the resistance status of this pest to five insecticides, namely abamectin, β-cypermethrin, fipronil, monosultap and phoxim, in South China from 1999 to 2009 with 4-6 populations tested each year. Laboratory bioassays using a standard leaf-dip method were conducted on 3rd instar larvae which were the progeny of field collected insects. LC50 values were estimated by probit analysis and resistance factors were calculated by comparing the field populations with a fully insecticide-susceptible lab population. The results showed that the diamondback moth populations generally had low resistance to abamectin from 1999 to 2005, but that resistance increased significantly during 2007-2009 with resistance factors as high as 122.4. Resistance factors for β-cypermethrin in 35 populations tested were high to very high in all 10 years with values ranging from 32.2 to 683.6. Resistance to fipronil had a progressive increase and increased markedly from 2007 to 2009 with one resistance factor of 56.1. Resistance to monosultap was low in 2004, but increased progressively from 2007 to 2009 with one resistance factor of 129.1. Resistance to phoxim was low to moderate from 2004 to 2008, but was moderate and high in 2009 with resistance factors ranging from 58.7 to 129.1. These results indicate that resistance of diamondback moth populations to most commonly used insecticides in South China has increased and is now generally high. © 2010 Elsevier Ltd. Source

Shao G.,Sun Yat Sen University | Jiang D.-X.,Key Laboratory of Natural Pesticide and Chemical Biology | Xu H.-H.,Key Laboratory of Natural Pesticide and Chemical Biology | Zeng W.,Sun Yat Sen University | And 2 more authors.
Journal of Photochemistry and Photobiology B: Biology | Year: 2010

A series of tetraethynylsilanes (TETS) have been synthesized by reaction of silicon tetrachloride (SiCl4) with Ar-C{triple bond, long}CLi, which was prepared in situ by treatment of Ar-C{triple bond, long}CH with n-BuLi. For these TETS thus prepared, their photoactivated insecticidal activities against the 4th-instar larvae of Aedes albopictus (Skuse) were evaluated to enrich the structure-activity relationship. In particular, compound 8 exhibited excellent photoactivated insecticidal activity, the LC50 value was 0.1346 mg L-1 under UV light treatment and the irradiation-generated enhancement in the activity was more than 69.58-fold, thus could be exploitable as ideal analog candidates in the search for new photoactivated insecticide leads. © 2009 Elsevier B.V. All rights reserved. Source

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