INBREEDING IN THE COFFEE BERRY BORER, HYPOTHENEMUS-HAMPEI (COLEOPTERA, SCOLYTIDAE) ESTIMATED FROM ENDOSULFAN RESISTANCE PHENOTYPE FREQUENCIES

Citation
Dp. Gingerich et al., INBREEDING IN THE COFFEE BERRY BORER, HYPOTHENEMUS-HAMPEI (COLEOPTERA, SCOLYTIDAE) ESTIMATED FROM ENDOSULFAN RESISTANCE PHENOTYPE FREQUENCIES, Bulletin of entomological research, 86(6), 1996, pp. 667-674
Citations number
38
Categorie Soggetti
Entomology
ISSN journal
00074853
Volume
86
Issue
6
Year of publication
1996
Pages
667 - 674
Database
ISI
SICI code
0007-4853(1996)86:6<667:IITCBB>2.0.ZU;2-#
Abstract
An estimate of the inbreeding coefficient, F-IS of the coffee berry bo rer, Hypothenemus hampei Ferrari, was calculated from genotype frequen cies of endosulfan resistance in beetles collected from berries in 41 different fields on the East Coast of New Caledonia. Two different est imates were obtained as a function of sampling date: (F) over cap(IS)= 0.491+/-0.059 (s.e.) for samples collected in September, and (F) over cap(IS)=0.215 +/- 0.108 for samples collected in April. These values o f (F) over cap(IS) are very high in comparison to those of most insect s, but surprisingly low given current understandings of H. hampei mati ng patterns. The difference between April and September F-IS estimates is discussed in terms of insecticide regimes and seasonal variability of sib inbreeding levels. The high level of inbreeding in the coffee berry borer increases frequencies of homozygotes relative to heterozyg otes. Inbreeding will accelerate resistance evolution whenever the fit ness of homozygous resistant insects exceeds that of heterozygotes, an d will undermine any high-dose strategy to control resistance evolutio n.