decay located in the roots; root decay is usually developed from the bottom up. and crown symptoms may or may not be visible.

Merriam-Webster Online Dictionary
root rot (noun)
any of various plant diseases characterized by decay of the roots and caused especially by fungi
root rot
root rot (Wikipedia)
Chickpea with root rot
Chickpea plant (Cicer arietinum) with root rot. The pale leaves show symptomatic discolouration, distinct from the healthy green leaves

Root rot is a disease in plants, in which the roots of a plant rot and decay.

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