Sterility mosaic disease of pigeonpea spread by

Answer: Option D

Sterility mosaic disease of pigeonpea spread by Mites.
The agent of sterility mosaic, a disease that is a major constraint on pigeonpea (Cajanus cajan) production in the Indian subcontinent, is transmitted by the eriophyid mite, Aceria cajani.
Sterility mosaic disease (SMD), caused by Pigeonpea sterility mosaic virus (PPSMV), is the economically most important viral disease in India, causing an estimated annual loss of more than US$300 million.