Acarologia (1999) 40, 227-230

Faten M. Momen and Maher El-Borolossy (1999)
Fertility and sex ratio of Typhlodromus athiasae and T. negevi under experimental conditions: influence of prey density (Tetranychus urticae)
Acarologia 40 (3), 227-230
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 killed per egg produced and the number of prey killed/day during the reproductive period increased with prey availability. The total number of reproductive days increased initially, but levelled off at higher levels of prey density. As the prey density was increased, there was a shift in sex ratio towards an increased proportion of females.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Faten M. Momen

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus urticae		Egypt
Typhlodromus athiasae (predator)	Tetranychus urticae		Egypt
Cydnoseius negevi (predator)	Tetranychus urticae		Egypt