Cassava stay-green score (CSGS)
The combined deleterious effects of leaf aging,
cassava green mite damage, drought, large
variations in day and night temperatures and
dry and dusty harmattan winds and other biotic
and abiotic factors are visually rated using the
cassava stay-green score (CSGS) which is
based on the general appearance of the leaves
of the plant.
This score takes into account the visual
appearance of the full canopy (figure 9) as
described by the various canopy architectural
forms and leaf distribution, number of leaves
retained, leaf color, leaf turgidity or wilting,
complete or partial drying, and greenness of
the leaves to account for the proportion of the
total leaf lamina area which is green and
photosynthetically active.