Nematode root knot galling presence - estimation Collect all roots from a standard-size excavation of 20 x 20 x 20 cm extending outwards from the corm of the plant. Take only roots from the selected plant. Divide the collected roots into two categories: dead roots, functional roots. Dead roots are completely rotten or shrivelled whereas functional roots show at least some healthy tissue. From the functional roots, randomly select five primary roots that are at least 10 cm, and reduce their length to 10 cm. Determine the presence/absence of root knot nematodes, observed externally as galls on the roots. scale_of acronym attribute variable_of entity method_of