Using colour image analysis for quantitative assessment of powdery mildew on cucumber |
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Authors: | Hans H Kampmann Ole B Hansen |
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Institution: | (1) Breeding Station Danefeld, L. D hnfeldt A/S, Odensevej 82, DK-5290 Marslev, Denmark;(2) OBH Service, Eskebjerggård 2, 1 th., DK-2760 Måløv, Denmark |
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Abstract: | Summary Visual assessment, black & white image analysis and colour image analysis of the severity of powdery mildew (Sphaerotheca fuliginea) infection on leaves of cucumber (Cucumis sativus) were compared. The extent of infection with powdery mildew was expressed as the number of spores per cm2. Statistical treatment of the data showed colour image analysis to be superior to the other two methods of evaluation. Major veins, light reflections and variations in the colour of leaves can degrade the accuracy of colour image analysis somewhat. These problems are, however, surmountable. Colour image analysis qualifies as a valuable new tool for accurate, objective, reproducible and detailed quantitative assessment of disease on leaves of plants.Abbreviations H
hue
- I
intensity
- IA
image analysis
- PM
powdery mildew
- S
saturation |
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Keywords: | colour image analysis cucumber Cucumis sativus partial resistance personal computer powdery mildew Sphaerotheca fuliginea |
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