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Host finding byCryptolaemus montrouzieri (Col., Coccinellidae) a predator of mealybusgs (Hom., Pseudococcidae)

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Abstract

AdultC. montrouzieri were able to detect their prey by visual and chemical stimuli. Presence of mealybug caused a significant increase in the number of turns and a sharp decrease in flight attempts suggesting detection by olfaction. In the light, adult predators found polystyrene dummies significantly faster than under dark (red light) conditions, but light had no effect on the time taken for adults to pass across an invisible test point. Fourth instar larvae could only perceive the prey by physical contact.

Résumé

Les adultes deC. montrouzieri sont capables de détecter leur proie grâce à des stimuli visuels ou/et olfactifs. La présence de la cochenille se traduit par une augmentation significative du nombre de changements de direction et par une diminution importante des tentatives d'envol. Ces observations suggèrent l'existence d'une détection de la proie par olfaction. A la lumière, les adultes de ce prédateur trouvent plus rapidement des leurres en polystyrène qu'ils ne le font à l'obscurité (lumière rouge). Mais la lumière est sans effet sur le temps mis par les adultes pour traverser un point test invisible. Les larves de quatrième stade percevrait la proie uniquement par contact physique.

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Authors and Affiliations

  1. Department of Biochemistry and Biological Sciences, Wye College, University of London, TN25 5AH, Ashford, Kent, U.K.

    M. Heidari & M. J. W. Copland

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  1. M. Heidari
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  2. M. J. W. Copland
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Heidari, M., Copland, M.J.W. Host finding byCryptolaemus montrouzieri (Col., Coccinellidae) a predator of mealybusgs (Hom., Pseudococcidae). Entomophaga 37, 621–625 (1992). https://doi.org/10.1007/BF02372333

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  • DOI: https://doi.org/10.1007/BF02372333

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