DIFFUSE REFLECTANCE SPECTROSCOPY: APPLICATIONS IN MEASURING MITE-FEEDING INJURY TO ORCHARD LEAVES

1 July 1974

journal article
Published by Canadian Science Publishing in Canadian Journal of Plant Science

Vol. 54 (3) , 505-509
https://doi.org/10.4141/cjps74-085

Abstract

Diffuse reflectance spectroscopy measured damage to leaves of McIntosh, Red Delicious and Golden Delicious apple (Malus sylvestrus Mill.) trees caused by varying population levels of the European red mite, Panonychus ulmi (Koch). The ratio of yellow pigment to green pigment in the leaves increased with increasing mite populations. Results were compared with those obtained by chlorophyll analyses. Transpiration burn injury was found to obscure such relationships, if they exist, on Bartlett pear (Pyrus communis L.) leaves on which mites had been feeding. The results indicate that reflectance spectroscopy will measure damage caused by leaf-feeding mites and is a more rapid and sensitive method of measurement than the analysis of chlorophyll in solution.

Keywords

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