What is the shape of alfa alfa virus?

The shape of the alfa alfa virus is Icosahedral.
Alfalfa mosaic virus (AMV), also known as Lucerne mosaic virus or Potato calico virus, is a worldwide distributed phytopathogen that can lead to necrosis and yellow mosaics on a large variety of plant species.
The icosahedral symmetry of the capsid is round to elongated. The range for the length of the virion particle is about 30 - 57 nm. AMV is a multipartite virus and is composed of four particles (three bacilliform and one spheroidal) with a diameter of 18 nm.