hard rot

hard rot

[′härd ‚rät]
(plant pathology)
Any plant disease characterized by lesions with hard surfaces.
A fungus disease of gladiolus caused by Septoria gladioli which produces hard-surfaced lesions on the leaves and corms.
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color defects and/or decay) were classified into 5 grades: 1 = no damage (no visible color defects or decay); 2 = color defect in pith with a diameter <20 mm (slight color change); 3 = hard rot in pith with a diameter <20 mm (clear color change, usually as a result of chemical reaction or preliminary stage of decay); 4 = hard rot (the wood material dark but still hard, a condition caused by an infection related to a decaying fungus); 5 = soft rot (wood material is dark and soft, and wears away when scratched) (see Schatz et al.
In both species the most common damage type (>50%) was hard rot in pith with a diameter <20 ram; this exceeded or equaled the proportion of no damage (Tables 2 and 3).
log with soft rot may also contain hard rot, hard rot in pith, or color defect in pith).