Effect of Temperature on the Functional and Numerical Responses of Lariophagus distinguendus (Hymenoptera: Pteromalidae) to Various Densities of the Host, Sitophilus oryzae (Coleoptera: Curculionidae)

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The functional and numerical response of Lartophagu.s dtsttnguendus (Forster) to various densities of its host (fourth instar Sttophtlus oryzae [L.]) were examined under five temperature conditions (20, 25, 28, 30"C, and room temperature). Temperature significantly influenced the relationship between host density and the number of hosts attacked: as temperature increased from 20 to 30"C, the coefficients of determination of the estimated curves increased from 0.26 to 0.65. The relationship between host density and the number of female L. dtsttnguendu.s emerging was also influenced by temperature; the coefficients of determination of the curves increased from 0.19 at 20"Cto 0.70 at 3O"C.Search efficiency of female parasitoids seemed unrelated to temperature, but handling time became significantly shorter with increasing temperature from 20 to 28°C and remained at a similar level at 30"C. Results suggested that regulation of rice weevil density by L. dtsttnguendus could be possible in the optimal temperature range (28-30"C) for the development of both insects.

Document Type: Research Article

Publication date: June 1, 1991

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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