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Fitness costs and stability of resistance to Bacillus thuringiensis in a field population of the diamondback moth Plutella xylostella L.
Author(s) -
Sayyed Ali H.,
Wright Denis J.
Publication year - 2001
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1046/j.1365-2311.2001.00358.x
Subject(s) - plutella , diamondback moth , bacillus thuringiensis , cry1ac , biology , population , population dynamics , resistance (ecology) , insecticide resistance , pest analysis , pink bollworm , lepidoptera genitalia , toxicology , botany , agronomy , fecundity , larva , genetically modified crops , genetics , gene , bacteria , demography , transgene , sociology
Summary 1. The stability of resistance to Bacillus thuringiensis Crystal (Cry) toxins in highly and moderately resistant sub‐populations of a Plutella xylostella field population (SERD4) was compared under laboratory conditions. The relative rate of decrease in resistance was greater in a highly resistant Cry1Ac‐selected population than in moderately resistant Cry1Ab‐ and Cry1Ca‐selected populations. 2. The intrinsic rate of population increase ( r m ) was similar in all populations tested. 3. These results suggest that there are no obvious overall fitness benefits as the frequency of the resistance alleles is reduced.