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Biological control of Bemisia argentifolii (Hemiptera: Aleyrodidae) on poinsettia with inundative releases of Eretmocerus eremicus (Hymenoptera: Aphelinidae): do release rates affect parasitism?

Published online by Cambridge University Press:  10 July 2009

M.S. Hoddle ,
R.G. Van Driesche ,
J.P. Sanderson  and
O.P.J.M. Minkenberg
M.S. Hoddle
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA
R.G. Van Driesche
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA
J.P. Sanderson
Affiliation:
Department of Entomology, Cornell University, Ithaca, NY 14583, USA
O.P.J.M. Minkenberg
Affiliation:
Department of Entomology, University of Arizona, Tucson, AZ 85721, USA
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Abstract

The effectiveness of inundative releases of the parasitoid Eretmocerus eremicus n. sp. Rose & Zolnerowich for control of Bemisia argentifolii Bellows & Perring on poinsettia in replicated experimental greenhouses was determined. We evaluated two release rates of E. eremicus: a low release rate (one female per plant per week, released in two greenhouses, in spring 1995) and a high release rate (three females per plant per week, released in two greenhouses, in spring 1994), each over a 14 week growing season. Each release trial had either one (1995) or two (1994) control greenhouses in which B. argentifolii developed on poinsettia in the absence of E. eremicus. Life-tables were constructed for B. argentifolii in the presence and absence of E. eremicus by using a photographic technique to follow cohorts of whiteflies on poinsettia leaves. Weekly population counts of whiteflies were also made. In the absence of E. eremicus, egg to adult survivorship of B. argentifolii on poinsettia was 75–81%. At the low release rate, egg to adult survivorship of B. argentifolii was 12% and parasitism was 34%. At the high release rate, egg to adult survivorship of B. argentifolii was 0.9% and parasitism was 10%. The average net reproductive rates (Ro) for populations of B. argentifolii in the absence of E. eremicus ranged from 20.5 to 26.1, indicating a rapidly increasing population density. Net reproductive rates for whitefly populations subject to parasitoid releases were 3.7 in the low release rate greenhouses, and 0.25 in the high release rate greenhouses, indicating substantially reduced B. argentifolii population growth. At week 14 of the trial, densities of immature whiteflies were lower in greenhouses at the low release rate when compared to the high release rate greenhouses. This was attributed to high levels of in-house reproduction by parasitoids at the low release rate.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 88 , Issue 1 , February 1998 , pp. 47 - 58
Copyright
Copyright © Cambridge University Press 1998

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