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Cottony maple scale and its natural control

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Abstract

An outbreak of cottony maple scale,Pulvinaria innumerabilis (Rathvon) was not controlled by chemical treatments, but large numbers of the coccinellid,Hyperaspis signata (Say), almost eliminated the scale in the succeding year.

Résumé

La Cochenille cotonneuse de l'Érable,Pulvinaria innumerabilis (Rathvon) fut très abondante près de Harrow, Ontario, en 1967. Le feuillage des érables argentés fut très éclairci et certaines des basses branches furent tuées. Un seul traitement au malathion provoqua quelque réduction des cochenilles mais seulement pendant une semaine.

En 1968, la CoccinelleHyperaspis signata (Say) est apparue en grand nombre. Les larves prédatrices mangèrent les œufs et les formes mobiles de la Cochenille et réduisirent en une saison les populations de celles-ci à un niveau endémique. Les adultes deH. signata étaient encore présents en 1969 et 1970.

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References

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Authors and Affiliations

  1. Canada Department of Agriculture, Research Station, Harrow, Ontario

    R. J. McClanahan

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  1. R. J. McClanahan
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McClanahan, R.J. Cottony maple scale and its natural control. Entomophaga 15, 287–289 (1970). https://doi.org/10.1007/BF02371006

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  • DOI: https://doi.org/10.1007/BF02371006

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