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The flea beetle, Agasicles hygrophila, was introduced to control the alligator weed, Alternanthera philoxeroides, in southern China and redistributed for over 20 years. The beetle has succeeded in establishing local field populations. Temperature, especially extreme low temperature in winter, is hypothesized to be a key factor determining the distribution of A. hygrophila. We studied the adult reproduction...
The ragweed beetle, Ophraella communa, is a potential biological control agent of common ragweed that appeared in Nanjing City in 2001 and has since dispersed throughout southeast China. We compared the cold hardiness of five different O. communa populations by measuring the supercooling point (SCP), water and glycerol contents of adult beetles. All indices of cold hardiness varied significantly among...
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