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Tebufenozide resistance selected in Plutella xylostella and its cross‐resistance and fitness cost
Author(s) -
Cao Guangchun,
Han Zhaojun
Publication year - 2006
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1234
Subject(s) - plutella , diamondback moth , abamectin , cross resistance , biology , chlorfenapyr , toxicology , fipronil , indoxacarb , phoxim , pesticide resistance , bioassay , acephate , plutellidae , insecticide resistance , veterinary medicine , pesticide , larva , botany , medicine , ecology , genetics
A susceptible strain of diamondback moth, Plutella xylostella (L.), was used to select for resistance to tebufenozide in the laboratory. After continuous selection with tebufenozide 17 times during 35 generations, a resistant strain was achieved with high resistance to tebufenozide (RR 93.8). Bioassay revealed that this strain showed high cross‐resistance to abamectin (RR 35.7), methoxyfenozide (29.1) and JS118 (16.5), and a little to deltamethrin (3.9), but no obvious cross‐resistance was found to cypermethrin (1.3), fipronil (1.3), trichlorfon (1.1), chlorfenapyr (1.0), phoxim (0.9) and acephate (0.8). The resistant and susceptible insects had similar development rates, but life table tests indicated that the resistant strain showed reproductive disadvantages, including decreased copulation rate, reproductivity and hatchability. When compared with the susceptible strain, the resistant insects had a relative fitness of only 0.3. This indicated that tebufenozide resistance selected under laboratory conditions had considerable fitness costs in this pest, and therefore rotational use of insecticides without cross‐resistance is recommended to delay development of resistance. Copyright © 2006 Society of Chemical Industry