In greenhouse inoculation tests we screened peanut (Arachis hypogaea) cultivars Florigiant and Florispan Runner and breeding lines Tifton 8, F393-9-5-1-2-3, F420-100 and F334A-B-14 for resistance to Diplodia gossypina, using a low and a high level of inoculum. Thirty days after inoculation at the low inoculum level, all of the F393-9-5-1-2-3 and 50% of the Florigiant plants were infected. Thirty days after inoculation at the high inoculum level, all plants of F393-9-5-1-2-3, F420100, Florigiant, and Tifton 8 were infected. Sixty days after inoculation, 50% of the Florispan Runner plants were infected. Ninety days after inoculation, 60% and 35% of Florispan Runner and F334A-B-14 plants, respectively, were infected. Pods of F393-9-5-1-2-3, F420100, Tifton 8, and Florigiant were severely rotted 30 days after inoculation. During this time, only 3% of the Florispan Runner pods were rotted, whereas pods of F334A-B-14 remained free of rot. D. gossypina was isolated from all seed from nonrotted pods of F393-9-5-1-2-3, F420100, Florigiant, and Tifton 8 after inoculation. Only 10% of Florispan Runner seed yielded isolates of this fungus. D. gossypina was not isolated from F334A-B-14 seed.
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Keywords: Diplodia collar rot, Arachis hypogaea, soil-borne fungi, diplodia gossypina
How to Cite:
Porter, D. & Hammons, R.,
(1975) “Differences in Plant and Pod Reaction of Peanut Lines to Infection by Diplodia gossypina¹”,
Peanut Science 2(1),
01 Jan 1975