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I completed the master degree in Taiwan, researching on the striped rice stem borer, Chilo suppressalis with strong resistance against carbofuran, a carbamate pesticide. Interestingly, the carbofuran-resistant borers show far lower resistance against organophosphate pesticides although organophosphate and carbamate pesticides have the same target, acetylcholinesterase. So my research was mainly involved in the enzyme kinetics in order to tell the binding sites of different pesticides on acetylcholinesterase of the susceptible and resistant strain.
My personal experience and reference review papers from Taiwan, China and Japan, show some differences in Chilo suppressalis from the tropical zone to the temperate zone, so I become very interested in the adaptation of climate change. After graduation, I fulfilled the compulsory military service and then travelled as a backpacker in Australia for a year.
I am studying the redlegged earth mites (RLEM), Halotydeus destructor which has been reported to have pyrethroid resistance in Western Australia, my supervisors are Prof Ary Hoffmann and Dr Paul Umina. I will focus on the gene flow and fitness costs of pyrethroid resistance in order to investigate the relationship between pesticide resistance, heat tolerance and diapause in RLEM
The fitness cost and population genetics of the redlegged earth mite.
Achievements / Awards:
Taiwan Entomological Society outstanding paper award of 2012.
Cheng Chang, Xuan Cheng, Xin-Yi Huang, Shu-Mei Dai. 2014. Amino acid substitutions of acetylcholinesterase associated with carbofuran resistance in Chilo suppressalis. Pest Management Science. (in press)
Cheng-Xiang Li, Xuan Cheng, Shu-Mai Dai. 2011. Distribution and Insecticide Resistance of Pink Stem Borer, Sesamia inferens (Lepidoptera: Noctuidae), in Taiwan. Formosan Entomologist 31: 39-50.
Xuan Cheng, Cheng Chang, Shu-Mei Dai. 2010. Responses of striped stem borer, Chilo suppressalis (Lepidoptera: Pyralidae), from Taiwan to a range of insecticides. Pest Management Science 66(7): 762-766.