Avocado terminal with bunchy, small-leaved foliage (left), caused by avocado sunblotch viroid, next to a healthy avocado terminal (right).

Small leaves on bunchy shoot terminal with short internodes from tree with avocado sunblotch viroid (ASBVD), held next to uninfected shoot. Santa Barbara Co., CA.  Credit: David Rosen
Credit: David Rosen