Fertility and sex ratio of Typhlodromus athiasae and T-negevi under experimental conditions: Influence of prey density (Tetranychus urticae)

Authors
Momen, FM El-Borolossy, M
Citation
Fm. Momen et M. El-borolossy, Fertility and sex ratio of Typhlodromus athiasae and T-negevi under experimental conditions: Influence of prey density (Tetranychus urticae), ACAROLOGIA, 40(3), 1999, pp. 227-230
Citations number
15
Categorie Soggetti
Entomology/Pest Control
Journal title
ACAROLOGIA
ISSN journal
0044586X → ACNP
Volume
40
Issue
3
Year of publication
1999
Pages
227 - 230
Database
ISI
SICI code
0044-586X(199910)40:3<227:FASROT>2.0.ZU;2-M
Abstract
Under experimental conditions, the fecundity of Typhlodromus athiasae and T . negevi increased with greater availability of prey (Tetranychus urticae), but declined after reaching a level of 32 prey/day. The number of prey kil led per egg produced and the number of prey killed/day during the reproduct ive period increased with prey availability. The total number of reproducti ve days increased initially, but levelled off at higher levels of prey dens ity. As the prey density was increased, there was a shift in sex ratio towa rds an increased proportion of females.