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 (Wikipedia)
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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.