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Influence of rice crop, climate and lunar cycles on the population patterns of Scirpophaga nivella

Published online by Cambridge University Press:  19 September 2011

T. C. Banerjee ,
N. Haque  and
A. K. Mahapatra
T. C. Banerjee
Affiliation:
Department of Zoology, Burdwan University, Burdwan 713 104, India
N. Haque
Affiliation:
Department of Zoology, Burdwan University, Burdwan 713 104, India
A. K. Mahapatra
Affiliation:
Department of Zoology, Burdwan University, Burdwan 713 104, India
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Abstract

Nightly catches of Scirpophaga nivella (F.) in light traps in rice plots in West Bengal, India, showed two discrete peaks of abundance in each trap-year corresponding to congenial weather and abundance of summer (mid-March-mid-June) and autumn (mid-July-mid-November) rice plants. Estimated generation times showed many overlapping generations in each trap a year. Variations in summer catches were significantly correlated (P < 0.01–0.05) with maximum temperature and minimum relative humidity of the day, and minimum temperature and wind speed of the night; whereas those in autumn catches were significantly associated with maximum temperature and minimum relative humidity of the night (P < 0.01–0.05). Autumn crops had more infestations, and sustained greater larval density than summer ones. Females were twice as heavy as males (2.1:1) and adults were heavier in October than in May. Catches of immature and mature females were consistently maximum at full moon and new moon, respectively.

Keywords

Scirpophaga nivellalight trap catchesseasonal abundancesuccessive generationsweather effectsrice plant phenologybiomassmoonlightovarian status
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 5 , October 1986 , pp. 593 - 598
Copyright
Copyright © ICIPE 1986

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References

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