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Effects of whitefly, Bemisia tabaci genn. On cotton yield and associated components

Published online by Cambridge University Press:  19 September 2011

N. Venugopal Rao ,
A.S. Reddy ,
R. Ankaiah  and
S. Mukundan
N. Venugopal Rao
Affiliation:
Regional Agricultural Research Station, Lam, Guntur 522 034, India
A.S. Reddy
Affiliation:
Regional Agricultural Research Station, Lam, Guntur 522 034, India
R. Ankaiah
Affiliation:
Regional Agricultural Research Station, Lam, Guntur 522 034, India
S. Mukundan
Affiliation:
Cotton Technological Laboratory (ICAR) Regl. Centre, Lam, Guntur
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Abstract

Varietal differences with respect to yield losses due to whitefly, Bemisia tabaci Genn. attack were observed at the “sooty-mould level” and “economic threshold (ET) level” of infestation. At the peak infestation level leading to sooty-mould development, the losses varied from 21.7 to 31.8% in boll numbers, 10.3 and 23.7% in boll-weight; 25.9 and 48.9% in seed cotton yield; 12.4 and 153% in seed oil and 29.4 and 66.5% in seed germination among the group of promising new cultures viz., LK 861, LPS 141 and L 389 and other group of commonly cultivated varieties viz., JKHY 1, MCU 5 and ADB 10050, respectively. Besides, the fibre qualities like length, strength, fineness and maturity were also found to be adversely affected.

Keywords

Bemisia tabacisooty-mould levelET levelyield lossfibre charactersBemisia tabaciniveau de la forme fuligineuseniveau ETperte de rendementcharacteres des fibres
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 5 , October 1989 , pp. 685 - 690
Copyright
Copyright © ICIPE 1989

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References

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