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EFFECT OF CONSTANT TEMPERATURES ON THE NUMBER OF LARVAL INSTARS OF THE ORIENTAL FRUIT MOTH, GRAPHOLITHA MOLESTA (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

W. P. Roberts ,
Jean R. Proctor  and
J. H. H. Phillips
W. P. Roberts
Affiliation:
Research Station, Agriculture Canada, Vineland Station, Ontario L0R 2E0
Jean R. Proctor
Affiliation:
Research Station, Agriculture Canada, Vineland Station, Ontario L0R 2E0
J. H. H. Phillips
Affiliation:
Research Station, Agriculture Canada, Vineland Station, Ontario L0R 2E0
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Abstract

Laboratory tests, at constant temperatures, were conducted to evaluate quantitatively the influence of temperature on development of the Oriental fruit moth, Grapholitha molesta (Busck). The results showed that at the highest temperature (30°C) some larvae had four instars and some had five, indicating a mixed population. Fifth instar larvae developed only at the highest temperature (30°C) where larval development was also most rapid. It can, therefore, be assumed that the Oriental fruit moth has four distinct larval instars when reared in the laboratory at 15°–24 °C.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 6 , 01 June 1978 , pp. 623 - 626
Copyright
Copyright © Entomological Society of Canada 1978

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References

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