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THE BIOLOGY OF IPS CALLIGRAPHUS AND IPS GRANDICOLLIS (COLEOPTERA: SCOLYTIDAE) IN JAMAICA

Published online by Cambridge University Press:  31 May 2012

Eric Garraway
Eric Garraway
Affiliation:
Department of Zoology, University of the West Indies, Kingston 7, Jamaica
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Abstract

Ips calligraphus (Germar) has previously been recorded from Jamaica but this is the first record of Ips grandicollis (Eichhoff) in the island. In Jamaica, both bark beetles attack 5 species of Pinus, 4 of which had not been previously recorded. The beetles thrive mainly on freshly cut logs and weakened trees, but recently they have been rising to economic importance in plantations. Successful attack on live trees is enhanced by mass aggregation of dispersing adults during invasion. Some adults may re-emerge after a phase of oviposition and disperse to new food sources. There is degeneration of flight muscles during oviposition, and regeneration to allow for another dispersive flight. In I. calligraphus attacking Pinus caribaea there was a mean of 26.74 ± 6.86 (mean ± SE) eggs per gallery, while in I. grandicollis there was 19.29 ± 3.04. The proportion of females at emergence was 0.57 ± 0.03 and 0.05 ± 0.02 in I. calligraphus and I. grandicollis, respectively.

Résumé

On avait déjà récolté Ips calligraphus (Germar) en Jamaïque, mais c’est la première mention de l’ Ips grandicollis (Eichhoff) sur l’île. En Jamaïque, ces deux scolytes s’attaquent à 5 espèces de Pinus, dont 4 n’avaient pas encore été mentionnées. Ces scolytes sont surtout florissants sur les arbres récemment abattus ou affaibles, mais ils ont tout juste atteint le seuil d’importance économique dans les plantations. Le succès de leur attaque sur des arbres vivants est autmenté par l’aggrégation massive des adultes en dispersion lors de l’invasion de l’arbre. Certains adultes peuvent réémerger suite à une période de ponte, pour se disperser vers de nouvelles ressources alimentaires. Il y a dégénération des muscles du vol durant la ponte, puis régénération pour un autre vol de dispersion. Chez l’Ips calligraphus sur Pinus caribaea, on a compté en moyenne 26,74 ± 6,86 (moyenne ± ESM) oeufs par galerie, et 19,29 ± 3,04 chez l’Ips grandicollis. La proportion de femelles à l’émergence était de 0,57 ± 0,03 et 0,50 ± 0,02, respectivement chez I. calligraphus et I. grandicollis.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 2 , February 1986 , pp. 113 - 121
Copyright
Copyright © Entomological Society of Canada 1986

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