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Abstract
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Article Information:
Effect of Sowing Date on the Incidence, Apparent Infection Rate and Severity of Scab on Cowpea
G.A. Mbong, C.N. Akem, O. Alabi, A.M. Emechebe and M.D. Alegbejo
Corresponding Author: Chrys Akem
Submitted: 2010 February, 02
Accepted: 2010 February, 17
Published: 2010 April, 10 |
Abstract:
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The main aim of this study was to investigate the effect of sowing dates on the incidences, apparent
infection rates and severities of cowpea scab, caused by Sphaceloma sp. on three varieties of cowpea
(Vigna unguilata L. Walp). The varieties were: TVx 3236, SAMPEA-6 and IT93K452-1. The investigations
were undertaken during the 2004, 2005 and 2006 cropping seasons at Samaru and Shika in Zaria, Nigeria. Four
sowings were done at 7-day interval starting from late July and ending in mid August of each year. Scab disease
incidence and severity ratings were taken every seven days starting from the first visible symptoms of infection
on the plant parts. The design used was a factorial concept in a Randomized Complete Block Design (RCBD)
with three replications consisting of single row plots, each 75 cm wide, 6 m long, and 75 cm apart. For all the
3 seasons, the early sown cowpeas had higher scab incidences, apparent infection rates and severities than the
late sown crops, even though not significantly higher in all cases or parameters. No scab symptoms were
observed on the leaves of the more resistant cultivar, TVx 3236, in all 3 years of the investigation. Under
northern Nigerian conditions, early cow pea plantings would result in higher infections from scab, unless more
resistant cultivars are used in such early plantings.
Key words: Apparent infection rate, cow pea, incidence, scab severity, sowing date, Sphaceloma,
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Cite this Reference:
G.A. Mbong, C.N. Akem, O. Alabi, A.M. Emechebe and M.D. Alegbejo, . Effect of Sowing Date on the Incidence, Apparent Infection Rate and Severity of Scab on Cowpea. Asian Journal of Agricultural Sciences, (2): Page No: 63-68.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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