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Influence of gibberellic acid and nitrogen sprays on transmission of cabbage black ringspot virus by Myzus persicae (Sulz.)

Published online by Cambridge University Press:  10 July 2009

I. W. Selman  and
Umarany Kandiah
I. W. Selman
Affiliation:
Wye College (University of London), nr. Ashford, Kent
Umarany Kandiah
Affiliation:
Wye College (University of London), nr. Ashford, Kent
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Extract

Transmission of cabbage black ringspot virus to turnip plants by Myzus persicae (Sulz.) was reduced by foliar sprays of five parts per million gibberellic acid together with 0·2% ammonium nitrate, but not by each applied separately. The reduction occurred at 10°C but not 15, 20 or 25°C, and at a light intensity of 10 000 lux but not at 5 000 lux. The response was usually only evident towards the end of the normal range of the incubation periods, indicating that protection was probably only achieved when relatively small amounts of inoculum were introduced. The reduced transmission could not be related to aphid behaviour but changes were found in the free proline content and fine surface structure of treated leaves, and it is suggested that the results are to be interpreted in terms of changes in host cell metabolism.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 60 , Issue 3 , February 1971 , pp. 359 - 365
Copyright
Copyright © Cambridge University Press 1971

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