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The effects of exposing eggs of four cotton insect pests to volatiles of Allium sativum (Liliaceae)

Published online by Cambridge University Press:  10 July 2009

G. Gurusubramanian  and
S.S. Krishna
G. Gurusubramanian
Affiliation:
Entomology Research Institute, Loyola College, Madras, India
S.S. Krishna*
Affiliation:
Entomology Research Institute, Loyola College, Madras, India
*
Prof. S.S. Krishna, Entomology Resesarch Institute, Loyola College, Madras-600 034, India.
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Abstract

Exposure of freshly laid eggs (<24 h old) of Earias vittella Fabricius (Lepidoptera: Noctuidae) and Dysdercus koenigii (Fabricius) (Hemiptera: Pyrrhocoridae) to volatiles from bulbs of Allium sativum significantly reduced their hatchability. Eggs of Spodoptera litura (Fabricius) (Noctuidae) treated likewise, failed to hatch. Eggs of Helicoverpa armigera (Hübner) (Noctuidae) were more tolerant and showed only a slight decrease in mortality. None of the immature stages of D. koenigii and H. armigera and only 30% of those of E. vittella that hatched from treated eggs managed to complete their metamorphosis. A few larvae of H. armigera developed to the pupal stage but their pupal weights were markedly low. These findings are interpreted as the chronic effects of volatiles affecting larvae/nymphs following developmental defects sustained during embryonic development. The known chief constituents such as allicin, 2-propene sulfenic acid, 2-propene thiol, propylene, thioacrolein and ajoene present in the volatiles were presumed to be responsible for the adverse consequences reported here.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 86 , Issue 1 , February 1996 , pp. 29 - 31
Copyright
Copyright © Cambridge University Press 1996

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