Wilt of pigeonpea is caused by

The Wilt of pigeonpea is caused by Fusarium udum.
Fusarium wilt of pigeon pea is both a soil-borne and seed-borne disease in which the infection level of untreated seeds may range from 13% to 19%. The infected seeds thus serve as a primary vehicle for the spread of this disease over long distances and/or to newer areas.
Fusarium wilt causes significant yield losses across the major pigeonpea production regions. Widespread and high diversity in F. udum hampers the breeding for pigeonpea wilt resistance.