Abstract
The effect of leaf hairs on searching efficiency of adult female Phytoseiulus persimilis was investigated. For this purpose we used the ornamental crop Gerbera jamesonii and determined the predator’s searching efficiency on three cultivars that differ largely in density of leaf hairs on the undersurface of the leaves. Walking speed of the mites was highest on the cultivar with the lowest leaf hair density. Walking activity, defined as the percentage of time spent walking, was not dependent on leaf hair density of the cultivars. At both prey densities tested, time until first predation increased with leaf hair density. Predation rate of adult female P. persimilis is affected by trichome density, especially when prey density is low. At prey densities of 1.3 and 2.5 T. urticae eggs/cm2, predation rate was inversely related to leaf hair density. At a prey density of 8.0 eggs/cm2 no significant effect of leaf hair density on predation rate was found. These negative effects on searching efficiency and predation success at low prey density of P. persimilis suggest that biological control of T urticae on gerbera may be hampered by leaf hairs.
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Krips, O.E., Kleijn, P.W., Willems, P.E.L., Gols, G.J.Z., Dicke, M. (1999). Leaf hairs influence searching efficiency and predation rate of the predatory mite Phytoseiulus persimilis (Acari: Phytoseiidae). In: Bruin, J., van der Geest, L.P.S., Sabelis, M.W. (eds) Ecology and Evolution of the Acari. Series Entomologica, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1343-6_29
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DOI: https://doi.org/10.1007/978-94-017-1343-6_29
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