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HORMONAL INDUCTION OF SUPERNUMERARY INSTARS IN THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

Arthur Retnakaran
Arthur Retnakaran
Affiliation:
Insect Pathology Research Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario
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Abstract

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Induction of supernumerary larval instars in the spruce budworm, Choristoneura fumiferana Clemens, by applying ZR-515, a potent juvenile hormone analogue, is explained in terms of larval differentiation. Application to the early sixth instar where structures are relatively indeterminate results in the formation of a supernumerary larval instar, whereas treatment of the late-larva wherein many structures are committed to differentiate towards the pupa, results in a larval–pupal mosaic.

Type
Articles
Information
The Canadian Entomologist , Volume 105 , Issue 3 , March 1973 , pp. 459 - 461
Copyright
Copyright © Entomological Society of Canada 1973

References

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