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TRANSLOCATION OF CACODYLIC ACID IN DUTCH ELM-DISEASED AMERICAN ELMS AND ITS EFFECT ON SCOLYTUS MULTISTRIATUS (COLEOPTERA: SCOLYTIDAE)1

Published online by Cambridge University Press:  31 May 2012

Bruce B. Hostetler  and
J. Wayne Brewer
Bruce B. Hostetler
Affiliation:
Department of Zoology and Entomology, Colorado State University, Fort Collins
J. Wayne Brewer
Affiliation:
Department of Zoology and Entomology, Colorado State University, Fort Collins
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Abstract

Cacodylic acid was injected into hatchet-made frill girdles 60 cm above the ground on Dutch elm-diseased American elms (Ulmus americana L.) at the rate of 0.8 ml/cm circumference measured 1.3 m above the ground. Cacodylic acid was translocated up the trees into the phloem. Arsenic residue analyses at several different heights in each tree indicated an inverse relationship between height and amount of cacodylic acid residue in the phloem. Largest amounts were translocated in trees with 75% wilted crowns.

Cacodylic acid injection into elms had no significant inhibitory effect on Scolytus multistriatus (Marsham) brood development. Cacodylic acid residues as high as 1700 ppm caused little or no beetle mortality. Highest numbers of beetles/dm2 bark surface area emerged from acid-treated elms with 75% crown wilt and from untreated elms with 100% crown wilt.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 8 , August 1976 , pp. 893 - 896
Copyright
Copyright © Entomological Society of Canada 1976

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