Filter-paper residual toxicities of some insecticides used extensively in China were determined during 1994 using newly hatched (within 30 min) larvae of four Pectinophora gossypiella (Saunders) strains. The strains were field collections collected in the Yangtze River cotton-belt areas. Compared with the susceptible laboratory strain from Qunli (Lishui County, Jiangsu province), the four field strains from Anqing (Anhui province), Jiangling (Hubei province), Cixi(Zhejiang province) and Tongzhou(Jiangsu province) had developed 185-, 6.7-, 698- and 249-fold resistance, respectively, to deltamethrin. Cixi and Tongzhou field strains had also developed 103- and 94-fold resistance to fenvalerate, and 10- and 3.6- fold resistance to parathion-methyl. Percentage of survivors at diagnostic dosage for deltamethrin showed that the strains from Anqing, Jiangling, Cixi and Tongzhou had 87.2, 18.3, 90.1 and 74.6% resistant individuals respectively. Cixi and Tongzhou field strains had 88.9 and 65.3% resistant individuals after application of parathion-methyl, which was consistent with the corresponding resistance ratios. Studies of the effect of synergists piperonyl butoxide (PBO), triphenyl phosphate (TPP) with deltamethrin and parathion-methyl in Cixi, Anqing and Tongzhou field strains suggested that metabolic resistance mechanisms such as carboxylesterases (CarE) and mixed function oxygenases (MFO) were involved in parathion-methyl resistance, but not in deltamethrin resistance.
|Original language||English (US)|
|Number of pages||4|
|State||Published - 1997|
- Insecticide resistance
- Pectinophora gossypiella
ASJC Scopus subject areas
- Applied Microbiology and Biotechnology