Caracterização das raças de H. maydis e comportamento de linhagens de milho frente à raça T
Keywords:
raça t, citoplasma macho-estéril, patógeno h. maydis, esporulação discos, intensidade esporulagdoAbstract
Five Helminthosporium maydis isolates out of 7 collected in the States of Espírito Santo, Minas Gerais, Paraná, and Rio Grande do Sul, Brazil, have been characterized as race T under the criteria of (1) symptoms induced on susceptible and resis tant varieties, (2) sporulation repression in infected leaf discs, and (3) inhibition of root elongation by culture extracts. The other two isolates were characterized as race O.
References
ARAGAKI, M. § BERGQUIST, R. R. Occurrence of Helminthosporium maydis in Hawaii.Plant Disease Reporter, Beltsville, 55 (5): 392-3, 1971.
BERGQUIST, R. R. § PEVERLY, G. Reaction of corn inbreds and genotypes to Helminthosporium maydis, Race T. Plant Discase Reporter, Beltsville, 56 (2): 112-4, 1972.
CAMPOS, V. de P. Caracterização das raças de Helminthosporium maydis Nisikado & Miyake e purificação de seus princípios tóxicos produzidos "in vitro”.Viçosa, U.F.V., Imprensa Universitaria, 1973. 49 p. (Tese MS).
CRAIG, J. Occurrence of Helminthosporium maydis Race T in in West Africa. Plant Disease Reporter, Beltsville, 55 (8): 672 - 3, 1971.
FARRAR, L.L. Introduction to the Southern Corn Leaf Blight session. Plant Disease Reporter, Beltsville, 54 (12): 1099, 1970.
FLEMING, A.A. Effect of cytoplasm on Southern Leaf Blight of Corn. Plant Disease Reporter,Beltsville,55 (6): 473 - 5, 1971.
FOLEY, D. C. § KNAPHUS, G. Helminthosporium maydis Race T. in Iowa in 1968. Plant Disease Reporter, Beltsville, 55 (10): 855-7, 1968.
HILTY, J. W. § JOSEPHSON, L. M. Reaction of corn inbrads with different cytoplasms to Helminthosporium maydis Plant Disease Reporter, Beltsville, 55 (3):195-8, 1971.
HOOKER, A.L.; SMITH, D.R.; LI, S. M.; BERCKETT, J.B. Reaction of corn seedlings with malesterile cytoplasm to Helminthosporium maydis. Plant Disease Reporter,Betsville, 54 (12):1109 - 10. 1970.
HYRE, R.A. Epidemiology of Southern Corn Leaf Blight- Exploratory Experiments. Plant Disease Reporter, Beltsville, 54 (12): 1131-5, 1970.
JELLUN, M.D. § ETHREDG, W.J. Effect of Race T of Helminthosporium maydis on corn grain yield. Agronomy Journal, Madison, 63 (4): 647-8, 1971.
JOSEPHSON, L.M.; GRAVES, C.R.; KINCER, H.C.; HILTY, J.W. Reductions in Yield of Corn from Southern corn Leaf Blight. Plant Disease Reporter, Beltsville, 55 (2): 115-8, 1971.
MOORE, W.F. Origin and spread of southern corn Leaf Blight in 1970. Plant Disease Reporter, Beltsville, 54 (12) 1104-8, 1970.
NELSON, R.R.; AYRES, J.E.; COLE, H., PETERSEN, D.H. Studies and observations on the past occurrence and geographical distribution of isolates of Race T of Helminthosporium maydis. Plant Disease Reporter, Beltsville, 54 (912): 1123-6, 1970.
SCHEIFELE, G.L.; WHITEHEAD, W.; ROWE, C. Increased susceptibility to southern leaf spot (delminthosporium maydis) in inbred lines and hybrids of maise with Texas malesterile cytoplasm. Plant Disease Reporter, Beltsville, 54 (6): 501-3, 1970.
SCHEIFELE, G.I. Geographical distribution of Helminthosporium maydis Race T for 1969 and 1970. Plant Disease Reporter, Beltsville, 54 (4) 302-6, 1971.
SMITH, D.R.: HOOKER, A.L.; LIM, S.M. Physiological Races of Helminthosporium maydis. Plant Disease Reporter, Beltsville, 54 (10): 819-22, 1970.
ULLSTRUP, A. J. History of Southern Corn Leaf Blight.Plant Disease Reporter, Beltsville, 54 (12): 1101-2, 1970.
WALKER, D.D. Labeling of 1971 seed corn. Plant Disease Reporte, Beltsville, 54 (12): 1114-7, 1970.
