caa a22 4500 388035765 CHVBK 20180307125004.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1017/S0007485300041547 doi S0007485300041547 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300041547 Biological control of Bemisia argentifolii (Hemiptera: Aleyrodidae) on poinsettia with inundative releases of Eretmocerus eremicus (Hymenoptera: Aphelinidae): do release rates affect parasitism? [Elektronische Daten] 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. Copyright © Cambridge University Press 1998 Hoddle M.S. Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA Van Driesche R.G. Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA Sanderson J.P. Department of Entomology, Cornell University, Ithaca, NY 14583, USA Minkenberg O.P.J.M. Department of Entomology, University of Arizona, Tucson, AZ 85721, USA Bulletin of Entomological Research Cambridge University Press 88/1(1998-02), 47-58 0007-4853 88:1<47 1998 88 BER https://doi.org/10.1017/S0007485300041547 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300041547 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hoddle M.S. Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA NATIONALLICENCE 700 1- Van Driesche R.G. Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA NATIONALLICENCE 700 1- Sanderson J.P. Department of Entomology, Cornell University, Ithaca, NY 14583, USA NATIONALLICENCE 700 1- Minkenberg O.P.J.M. Department of Entomology, University of Arizona, Tucson, AZ 85721, USA NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/1(1998-02), 47-58 0007-4853 88:1<47 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence SWISSBIB 388035765 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge