80% reduction of the leaf number compared to full canopy, more than 75% of the remaining old leaves are wilted or brown, young leaves have reduced greeness or are yellowing 7 80% reduction of the leaf number compareed to full canopy more than 75% of the remaining old leaves are wilted or brown young leaves have reduced greeness or are yellowing. 9 Complete defoliation of the stem with candlestick appearance Complete defoliation of the stem with candlestick appearance dieback is also evident on the stem. 6 5 50% reduction of the leaf number compared to full canopy, most of the older leaves are droppy, wilted and practically dry, most of the young leaves have reduced greeness or are yellowing. entity Normal plant with full canopy, retaining most formed leaves which are green, turgid and photosynthetically active. 1 scale_of 30% of the leaves have dropped , less than 50% of the remaining leaves are droppy, partially wilted and practically dry, most of the young leaves have reduced greenness or are yellowing. 3 attribute 8 variable_of acronym method_of 9pt scale