NDLI: The effect of varying Bemisia argentifolii and Eretmocerus mundus ratios on parasitism

Content Provider	Springer Nature Link
Author	Jones, Walker A. Greenberg, S. M. Legaspi, B.
Copyright Year	1999
Abstract	We investigated the effects of different host: parasitoid ratios on the efficacy of the parasitoid Eretmocerus mundus attacking the silverleaf whitefly, Bemisia argentifolii. When host density was held constant (100 second instars) and parasitoid density was decreased from 15 to 1 females, the percentage of total host mortality was significantly lower at low parasitoid densities. The number of host nymphs killed, and the number of female parasitoid progeny per female, increased 3.6 and 20.4 times, respectively. The emergence rate, sex ratio, longevity, and body lengths of progeny were significantly larger at the lowest parasitoid density while developmental time was significantly shorter. When the number of hosts was increased from 5 to 250 and parasitoid density was held constant (5 females), the percentage of nymphal mortality decreased 1.6 times. The percentage of desiccated nymphs was significantly highest (65.7%) at the lowest host density, while percentage parasitism (34.3%) was significantly lowest at the lowest host density. The data could be described using a Type I functional response curve. We propose a generalized index of efficacy (GIE) to summarize and compare the total effects of parasitoid--host ratios. This index showed that the most efficient ratio was one parasitoid female per ten second instar host nymphs.
Starting Page	13
Ending Page	28
Page Count	16
File Format	PDF
ISSN	13866141
Journal	BioControl
Volume Number	44
Issue Number	1
e-ISSN	15738248
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Evolutionary Biology Plant Sciences Plant Pathology Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Insect Science Agronomy and Crop Science

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