Plum pox show no symptoms on leaves or fruit. Not all infection in "Prunus" are characterized by a ring symptom on leaves. Several cultivars show yellowing line patterns and blotches, or necrotic ring symptoms on expanded leaves. Leaf distortion has also been observed. Infected fruit can develop yellow rings or blotches, or brown rings, and some plum and apricot fruit can be severely deformed and bumpy. The seed of many infected apricots and some plums show rings. Many non-"Prunus" species, in at least nine plant families, have been infected artificially with one or more strains of the plum pox virus, and in
Plum Island Airport 2006 to 2012, Plum Island Aerodrome housed Noyes Enterprises, which restored and sold Cessna L-19 Bird Dog aircraft. During this time, the hangar and facilities were used to repower and modify a large number of Cessna L-19 aircraft for the Royal Canadian Air Cadets. Since October 2006, the airport has been leased from Historic New England, and has operated under the name Plum Island Aerodrome. Since then, a hangar has been constructed and the museum has been improved. In July 2010, the 10/28 asphalt runway was resurfaced. Plum Island Airport Plum Island Airport, in Newburyport, Massachusetts, is a privately owned,