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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 2, No. 2, 1994, pp. 207-214
Bioline Code: cs94031
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 2, No. 2, 1994, pp. 207-214

 en Evaluation of 80 Cowpea Lines for Resistance to Scab, Sphaceloma SP
Iceduna, C.L; Adipala, E & Ogenga-Latigo, M.W

Abstract

Eighty cowpea lines were evaluated in Uganda under natural disease pressure for resistance to Sphaceloma check for this species in other resources sp., the causal agent of cowpea scab, during the second (short) rains of 1991 and the first (long) and second rains of 1992. Scab severity (percent plant area affected) varied with season and averaged 32% in 1991, and 2% and 24% during the first and second rains of 1992, respectively. Cowpea lines were ranked as resistant, moderately resistant, and susceptible when percent plant area affected averaged <15, 15-30, and >30 in 1991; <1.5, 1.5-4.0, and >4.0 in the first rains of 1992; and <15, 15-24, and >24 in the second rains of 1992. Overall, 25 lines were considered resistant, 20 moderately resistant and 35 susceptible.

Keywords
AUDPC, disease rating, resistance, screening, Vigna unguiculata

 
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