Who first reported spiroplasma as a causal agent of corn stunt disease?

Correct option is C

Correct option (c) Davis and Worley
· First to report Spiroplasma as the causal agent of corn stunt disease.
· Spiroplasma are wall-less, helical, phloem-limited pathogens.
· Transmitted by leafhoppers.
Other options:
· (a) Adolf Mayer – Worked on tobacco mosaic disease.
· (b) W.M. Stanley – Crystallized TMV.
· (d) D. Ivanovsky – Discovered filterable viruses.