THE IMPACT OF SPERM PRECEDENCE IN MALATHION RESISTANCE TRANSMISSION IN POPULATIONS OF THE RED FLOUR BEETLE TRIBOLIUM-CASTANEUM (HERBST) (COLEOPTERA, TENEBRIONIDAE)
E. Haubruge et al., THE IMPACT OF SPERM PRECEDENCE IN MALATHION RESISTANCE TRANSMISSION IN POPULATIONS OF THE RED FLOUR BEETLE TRIBOLIUM-CASTANEUM (HERBST) (COLEOPTERA, TENEBRIONIDAE), Journal of Stored Products Research, 33(2), 1997, pp. 143-146
Malathion resistance in the red flour beetle Tribolium castaneum (Herb
st) (Coleoptera: Tenebrionidae) is actually a worldwide problem, and s
tudies on resistance transmission are needed to improve insecticide re
sistance management. Females of Tribolium castaneum commonly mate with
several males, and the last batch of male sperm preferentially fertil
izes subsequent eggs. This phenomenon, a particular form of sexual sel
ection, helps to increase resistance transmission in populations of st
ored product insects. We confirmed the last male sperm precedence and,
in the absence of further matings, examined the evolution of mixed su
sceptible and malathion-resistant progeny during a 3-month period. The
proportion of resistant phenotypes in female progeny was 99.6 and 3%,
respectively, after the first mating with a resistant male and the se
cond mating with a susceptible one. When females thus mated twice were
isolated from males, the proportion of the resistant phenotype increa
sed to 34.1% after 30 days. From 72 days onwards, this proportion rang
ed from 14.2 to 29.7%. (C) 1997, Published by Elsevier Science Ltd.