incidence and Geographic Distribution of Maize Rayado Fino Virus (MRFV) in Latin America. Richard Kogel, Centro de Investagaci6n en Biologia Celular y Molecular (CIBCM), Escuela de Biologia, Universidad de Costa Rica, San Jose, Costa Rica. Rosemarie W. Hammond, U.S. Department of Agriculture, Agricultural Research Service, Molecular Plant Pathology Laboratory, Beltsville, MD 20705; and Pilar Ramirez, Centro de Investagaci6n en Biologia Celular y Molecular (CIBCM), Escuela de Biologia, Universidad de Costa Rica, San Jose, Costa Rica;. Plant Dis. 80:679. Accepted for publication 6 March 1996. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1996. DOI: 10.1094/PD-80-0679.

Samples of maize (Zea mays L.) exhibiting symptoms of,the maize rayado fino virus (MRFV) were collected in eight Latin American countries during August to December of 1992, as part of a survey of virus distribution. Maize with MRFV symptoms were found in all countries and life zones sampled. Of the 103 collected plants tested for the presence of MRFV using hybridization with an MRFV cRNA probe, 75% were positive for the virus. Much variation in MRFV symptoms and symptom expression patterns was found.