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The effect of twig diameter on emergence rates of the oak twig pruner (Coleoptera: Cerambycidae)

Published online by Cambridge University Press:  16 June 2016

William P. Brown ,
Marion E. Zuefle  and
Jason J. Dombroskie
William P. Brown*
Affiliation:
Division of Natural Sciences and Mathematics, Keuka College, Keuka Park, New York, 14478, United States of America
Marion E. Zuefle
Affiliation:
IPM Program Office, NYSAES, 630 W. North Street, Geneva, New York, 14456, United States of America
Jason J. Dombroskie
Affiliation:
Department of Entomology, Comstock Hall, Cornell University, Ithaca, New York, 14850, United States of America
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Oak twig pruner (Anelaphus parallelus (Newman); Coleoptera: Cerambycidae) larvae develop inside twigs pruned from host plants. Reasons for this behaviour are unknown and differential emergence due to twig diameter has not been explored. Twigs pruned from walnuts (Juglans nigra Linnaeus; Juglandaceae) (n=179) and oaks (Quercus Linnaeus; Fagaceae) (n=84) were collected in Pennsylvania, United States of America in 2010; 118 pruned oak twigs were collected in New York State, United States of America in 2012. Twigs from 2012 were dissected to determine rates of emergence and larval mortality; both samples were examined for parasitoids. As the diameter of oak twigs (range of 3–16 mm) increased, larval mortality increased and adult emergence decreased. Date of collection did not influence twig diameter nor emergence rates. Three new parasitoids were associated with the oak twig pruner: Atanycolus Förster (Hymenoptera: Braconidae), Eubazus denticulatus (Martin) (Hymenoptera: Braconidae), and a potentially new genus of wasp (Hymenoptera: Braconidae, Hormiinae near Pambolus Haliday). Parasitism rates were an order of magnitude greater among twigs that contained more than one larva or pupa (23.1%; n=26) compared to those that contained only one (2.3%; n=341).

Type
Behaviour & Ecology
Information
The Canadian Entomologist , Volume 148 , Issue 6 , December 2016 , pp. 693 - 697
Copyright
© Entomological Society of Canada 2016 

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Footnotes

Subject Editor: Dylan Parry

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