Abstract
Supplementary tungsten light applied either continuously or during every alternate 150-s period for 16 h during each of the 2 days immediately before inoculation, inhibited the development of arabis mosaic virus disease on cucumber. Less systemic disease was observed when the visible component of the tungsten radiation was also filtered out. Supplementary radiation applied after inoculation of the cotyledons was more inhibitory than that applied during the 2 days before inoculation. During the treatments leaf temperatures rose approximately 6 °C above ambient. High intensity wide spectrum light (giving the same temperature rise) was less inhibitory than any of the other treatments. The results show that plant reactions to changes in the spectral power distribution of incident radiation can severely affect the development of disease symptoms.
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