Start Submission Become a Reviewer

Reading: Population dynamics of the coconut caterpillar, Opisina arenosella Walker (Lepidoptera: Xylo...

Download

A- A+
dyslexia friendly

Articles

Population dynamics of the coconut caterpillar, Opisina arenosella Walker (Lepidoptera: Xyloryctidae), in Sri Lanka

Authors:

P. A. C. R. PERERA ,

COCOS, LK
About P. A. C. R.
Coconut Research Institute, Lunuwila, Sri Lanka.
X close

M. P. HASSELL,

About M. P.
Department of Pure and Applied Biology, Imperial College at Silwood Park, Ascot,
Berkshire,
SL5 7PY, UK.
X close

H. C. J. GODFRAY

About H. C. J.
Department of Pure and Applied Biology, Imperial College at Silwood Park, Ascot,
Berkshire,
SL5 7PY, UK.
X close

Abstract

Opisina arenosella Walker is a defoliating pest of coconut in Sri Lanka. A first
attempt was made to understand its population dynamics. Analysis of records of
population outbreaks throughout the country from 1965 to 1985 revealed cycles in the
population of approximately one generation period, giving the population the
appearance of partially discrete generations. There was also evidence for longer cycles
of six-month period. Outbreaks occurred throughout the coconut-growing regions of
Sri Lanka, and the numbers of outbreaks per year in different provinces were
sometimes correlated, indicating a common, probably climatic, triggering mechanism.
Parasitism remained high throughout the outbreaks and there was some evidence that
pupal parasitism increased towards the end of an outbreak. A working hypothesis that
explains the population dynamics of O. arenosella and the origin of outbreaks is
presented.
How to Cite: PERERA, P.A.C.R., HASSELL, M.P. & GODFRAY, H.C.J., (2010). Population dynamics of the coconut caterpillar, Opisina arenosella Walker (Lepidoptera: Xyloryctidae), in Sri Lanka. COCOS. 7, pp.42–57. DOI: http://doi.org/10.4038/cocos.v7i0.2064
Published on 08 Jul 2010.
Peer Reviewed

Downloads

  • PDF (EN)

    comments powered by Disqus