Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 120146
Title Effect of prey and predictor density on prediction of rice leaffolder eggs by the cricket Metioche vittaticollis.
Author(s) Kraker, J. de; Huis, A. van; Lenteren, J.C. van; Heong, K.L.; Rabbinge, R.
Source Biocontrol Science and Technology 11 (2001). - ISSN 0958-3157 - p. 69 - 82.
Department(s) Laboratory of Entomology
Plant Production Systems
Publication type Refereed Article in a scientific journal
Publication year 2001
Abstract Cage experiments were conducted to quantify the predation rate of the cricket Metioche vittaticollis (Sta˚l) on the eggs of rice leaffolder Marasmia patnalis Bradley. Egg predation by adult females was measured in response to changes in egg density, predator density and leaf area per cage. The number of eggs consumed per predator increased with egg density, without reaching a plateau. The predation rate decreased with increasing leaf area. The functional response could be adequately described with a linear Type I model, with the effect of leaf area included. This type of response to leaffolder egg density means that predation was not limited by prey handling time or satiation, but by the search rate. The search rate is here interpreted as the leaf area effectively searched for leaffolder eggs by a single predator in one day. Estimated search rates averaged 0.13 m2 day -1 for M. vittaticollis females. The search rate of the predators increased with prey density, but a model describing a density dependent search rate explained only 3 f the total variation in search rate. Increasing predator density per cage led to a decrease in the per capita egg predation rate when predator density was more than two per m2 leaf area. Interference might thus reduce the potential to enhance leaffolder egg predation by conservation or augmentation of predatory cricket populations
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