A Note on a Greenhouse Evaluation of Wild Arachis Species for Resistance to Athelia rolfsii

ABSTRACT Athelia rolfsii (Curzi) C.C. Tu & Kimbr. is the one of most damaging pathogens cultivated peanut, causing soilborne disease known regionally as white mold, stem rot, or southern blight. Because genetic base for peanut narrow, wild Arachis species may possess novel sources resistance. We evaluated 18 accessions representing 15 (batizocoi, benensis, cardenasii, correntina, cruziana, diogoi, duranensis, herzogii, hoehnei, kempff-mercadoi, kuhlmannii, microsperma, monticola, simpsonii, williamsii) in greenhouse resistance to At. rolfsii. Assays were conducted on intact plants propagated from rooted cuttings inoculated with mycelial plugs, and lesion length growth measured at 4, 6, 10, 12 days after inoculation. For length, batizocoi (PI 468326 PI 468327), A. kuhlmannii 468159 susceptible entries a mean >50 mm microsperma 666096 674407) diogoi 468354 had shortest lesions lengths ≤16 cruziana 476003 two PIs highest area under progress curves (AUDPCs), lowest AUDPC was obtained 674407. Mycelial correlated except monticola 497260. These results be useful geneticists seeking additional