Journal of Economic Entomology (1995) 88, 470-474

Luc O. Brun, D. Maxwell Suckling, Richard T. Roush, Veronique Gaudichon, Haiganoush Preisler and Jacqueline L. Robertson (1995)
Genetics of endosulfan resistance in Hypothenemus hampei (Coleoptera: Scolytidae): Implications for mode of sex determination
Journal of Economic Entomology 88 (3), 470-474
Abstract: The genetics of endosulfan resistance in Hypothenemus hampei (Ferrari) was studied through classical crosses to determine the degree of dominance and number of genes involved. After adult beetles were sprayed, mortality was recorded at 6 h and 7 d. Tests of the males from reciprocal F₁ crosses indicated that resistance is sex-linked or that paternal chromosomes are inactive in the.sons. Responses of F₁ females after 6 h indicated degrees of dominance of -0.38 ± 0.03 and -0.25 ± 0.03 for RR X S and SS X R crosses, respectively. In contrast, dominance after 7 d was -0.17 ± 0.02 and -0.02 ± 0.02, apparently indicating a trend toward codominance over time. Responses of backcrosses of the F₁ generation to both parental lines and of F₂ progeny were inconsistent with results predicted when assuming simple Mendelian inheritance. These results illustrate the practical weaknesses of backcrosses in estimating the number of genes that control resistance in situations where bioassays are inconsistent or where discrimination between genotypes is poor.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): David Maxwell Suckling

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hypothenemus hampei	Coffee (Coffea)	New Caledonia