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. entity Complete defoliation of the stem with candlestick appearance dieback is also evident on the stem. 9 Complete defoliation of the stem with candlestick appearance 8 1 Normal plant with full canopy, retaining most formed leaves which are green, turgid and photosynthetically active. 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. 5 6 scale_of 3 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. method_of variable_of acronym attribute 9pt scale