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Early Evaluation of Corn for Resistance to Brown Spot 1
Author(s) -
Cress C. E.,
Thompson D. L.
Publication year - 1962
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/cropsci1962.0011183x000200040016x
Subject(s) - agricultural experiment station , crop , library science , citation , resistance (ecology) , state (computer science) , agricultural science , agriculture , agronomy , computer science , geography , biology , archaeology , algorithm
R O W spot of corn, caused by Physodnma inaydis B Miyabe, frequently occurs in the southeastern United States. Although the disease is considered to be of minor importance, reductions in grain yields up to 25% ( 3 ) have been reported. Development of resistant hybrids is the only practical means of contrpl. Breeding for resistance can be accomplished successfully by inducing an epiphytotic among plants subject to selection. A successful inoculation technique which involves introducing a suspension of sporangia into the whorl when the plants are 3 to 4 feet tall has been used (8). The efficiency of this technique has been limited because symptoms do not develop in time for resistant p h t s to be identified until after flowering and pollination. Under these circumstances all plants must be pollinated to maintain the genotype 2nd most will be discarded when the disease reaction becomes known. A technique which would provide identification of resistant plants before anthesis would offer definite breeding advantages. The purpose of this study was to examine factors relating to inoculation procedures. Specific objectives included