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Fruit Varieties Journal
(Fruit Var J)

American Pomological Society

Volume 44 Number 1 Article 10 Pages: 45-47
Year 1990 Month 1
Title: Influence off Levels of Leaf Expression of Apple Mosaic on Net Photosynthesis and Transpiration of Leaves of Four Apple Cuitivars
Authors: D.C. Ferree and K. Clayton-Greene
Net photosynthesis and transpiration of leaves of 4 apple cuitivars displaying progressive levels of chlorosis due to apple mosaic (Marmor mali) were measured in the field. There was a linear depression of both net photosynthesis (Pn) and transpiration (Tr) with increasing chlorosis on the leaves of all 4 cuitivars. 'Jonathan,' which exhibited the most severe symptoms in the field, had very low Pn rates at each level of symptom expression.

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