Journal of Entomological Science (1996) 31, 102-111

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Jesusa Crisostomo Legaspi, J.A. Correa, R.I. Carruthers, B.C. Legaspi Jr. and Donald A. Nordlund (1996)
Effect of short-term releases of Chrysoperla rufilabris (Neuroptera: Chrysopidae) against silverleaf whitefly (Homoptera Aleyrodidae) in field cages
Journal of Entomological Science 31 (1), 102-111
Abstract: We studied the effect of different lacewing (Chrysoperla rufilabris [Burmeister] release rates on control of the silverleaf whitefly, Bemisia argentifolii Bellows and Perring, inside field cages in organically-grown watermelon and in Lablab purpureus, a leguminous forage crop. Second-instar C. rufilabris larvae were released at rates of 0 (control), 10, 25, and 50 per cage (0.37 m2 area). Whitefly counts were made prior to release and compared with those taken 48 h after release of the lacewings. In the watermelon field, the control had approximately 35% more whiteflies over the entire season as compared to the predator treatment with the highest whitefly counts (25 lacewings per plant). The effects of predator releases were most evident during the second half of the season. However, higher rates of predator release did not result in increased pest suppression. No significant patterns of prey suppression were detected in the legume field; possibly because prey densities were already too high at the start of the experiment. Whitefly population dynamics in the lablab was apparently determined by environmental factors and crop phenology, rather than by predation. Possible reasons are presented for observed differences in degrees of pest suppression afforded by lacewing larvae in order to optimize control of the whitefly populations.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Jesusa Crisostomo Legaspi

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
inundative/inoculative release

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Bemisia tabaci biotype MEAM1 Watermelon/colocynth (Citrullus) U.S.A. (mid S)
Bemisia tabaci biotype MEAM1 Hyacinth bean (Lablab purpureus) U.S.A. (mid S)
Chrysoperla rufilabris (predator) Bemisia tabaci biotype MEAM1 Watermelon/colocynth (Citrullus) U.S.A. (mid S)
Chrysoperla rufilabris (predator) Bemisia tabaci biotype MEAM1 Hyacinth bean (Lablab purpureus) U.S.A. (mid S)