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Seasonal incidence of the sorghum earhead bug, Calocoris angustatus Lethierry (Hemiptera: Miridae)*

Published online by Cambridge University Press:  19 September 2011

I. G. Hiremath  and
T. S. Thontadarya
I. G. Hiremath
Affiliation:
University of Agricultural Sciences, Bangalore, India
T. S. Thontadarya
Affiliation:
University of Agricultural Sciences, Bangalore, India
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Abstract

Seasonal incidence of the sorghum earhead bug, Calocoris angustatus Lethierry, was studied by sowing the crop once in 10 days, throughout the year during 1978 and 1979, as well as by sowing it at fortnightly intervals from early “kharif” to late “rabi” during 1979. The bug was found throughout the year except for a few weeks during March, April and May. The milky stage of the earhead was the most preferred stage compared to pre-flowering, a third flowering, flowering and ripening stages. The adults dominated during pre-flowering and a third flowering stages whereas nymphs dominated during milky and ripening stages. The computed seasonal indices were higher during August (230), September (222), October (224) and January (215) which coincided with blooming and milky stage of sorghum in general fields. Correlation studies between the bug population at the milky stage and maximum temperature indicated negative and significant (r = -0.2967) relationship, and positive and significant (r = +0.2727) relationship with relative humidity. Low incidence of bugs was observed on the crop sown during June.

Keywords

Sorghum earhead bugCalocoris augustatusseasonal incidenceseasonal indicessowing dateshybrid sorghum
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 5 , Issue 6 , December 1984 , pp. 469 - 474
Copyright
Copyright © ICIPE 1984

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References

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