A new virus disease of maize in Peru.
Maize chlorotic mottle virus produced chlorotic leaf stripes on the maize hybrid PM-205; later the stripes coalesced into blotches, necrosis followed, then epinasty and death. The virus was transmitted mechanically to PM-205 and 7 other Gramineae, but 50 other spp. were uninfected. The pattern of spread suggested insect transmission, but 3 aphid spp. tested were not carriers. Seed transmission failed. In sap the virus lost infectivity on heating for 10 min at 85 deg C or on dilution to 10-6, but survived storage at room temp. for 12 days. Particles were isometric, 30 nm in diam. and it was unrelated serologically to 6 viruses of Gramineae.