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Inheritance and Breeding Information Pertaining to Brown Spot Resistance in Corn 1
Author(s) -
Thompson D. L.,
Rawlings J. O.,
Moll R. H.
Publication year - 1963
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1963.0011183x0003000600016x
Subject(s) - agricultural experiment station , inheritance (genetic algorithm) , crop , library science , citation , biology , genealogy , agriculture , genetics , history , computer science , agronomy , gene , ecology
D. L. Thompson, J. O. Rawlings, and R. H. Moll BROWN spot of corn (Zea mays L.) caused by Pbysoderma. maydis Miyabe is a disease which attacks the leaves, leaf sheaths, and stalks of corn. Numerous small light-colored spots usually start to appear about silking time and soon turn dark brown and coalesce into large irregular areas. In severe cases leaves die prematurely and stalks break because of weakened tissue. In the United States severe outbreaks of the disease are usually limited to the South because of high moisture and warm temperature requirements for infection and growth of the organism. Primary losses attributable to brown spot are reduced grain yield and harvest difficulty due to lodging. Yield losses of 5 to 15% have been reported by Tisdale (16) and Eddins (5). Broyles (2) estimated an average yield loss of 1.9% after surveying 256 Mississippi fields in 1957. Although 75% of the fields surveyed were essentially free from brown spot, he found losses ranging up to 25% in some fields. In experimental plots artificially inoculated with brown spot, Broyles (2) noted yield losses as high as 67% and lodging as high as 100%. At present development and use of resistant hybrids appear to be the only means of practical control. Experiments reported herein were conducted to study the inheritance of brown spot resistance and to relate the brown spot reaction of hybrids to that of their parental inbreds.