Effects of varietal differences and severity of seed damage by Callosobruchus maculatus (F.) on the weight and germination of some improved cowpea seeds.
No Thumbnail Available
Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Nigerian Journal of Entomology
Abstract
The effects of varietal differences and severity of seed damage by the cowpea bruchid,
Callosobruchus maculatus, on the weight and germination of some improved cowpea seeds were
investigated in a S x 4 factorial experiment laid out in a completely randomized design replicated three
times. Five improved cowpea seed varieties, namely, - SAMPEA 6, SAMPEA 7, SAMPEA 9,
SAMPEA 10 and SAMPEA 11, were exposed to infestation and damage by C. maculatus. The
damaged seeds were sorted, based on the number of exit hole( s) in them, into - no-hole, one hole, twohole,
and three-hole groups and thereafter placed on moist tissue paper in Petri dishes. The emergence
of radicles and primary leaves 96 hours after placement (HAP) were used as germination indicators.
SAMPEA 6 and SAMPEA 7 had the highest and lowest mean weight per seed (207.Smg and lS9.2mg)
respectively and both differed significantly (P<O.OS)from other varieties. SAMPEA6 and SAMPEA 7
both had a significantly higher (P<O.OS)mean percentage germination (100.0%) than other varieties
based on the emergence of radicles. Similarly, SAMPEA 7 and SAMPEA 11 had the highest mean
percentage germination (2S.0%) based on the emergence of primary leaves but were significantly
difIerent(P<O.OS) from SAMPEA6 and SAMPEA 10 only. The mean weight value (193.7mg) of seeds
with no holes differed significantly (P<O.OS)from those of seeds with one or more holes. Based on the
emergence of radic1es and primary leaves, seeds with no hole had highest percentage germination
(93.33% and 61.33%) respectively and were significantly (P<O.OS)different from those with hole(s).
Significant interaction effects were also observed between variety and number of holes at P=0.05.
Description
Keywords
Callosobruchus maculatus, SAMPEA, seed damage, Cowpea seeds
Citation
Ojumoola, A.O.&Adesiyun, A.A. (2015): Effects of varietal differences and severity of seed damage by Callosobruchus maculatus (F.) on the weight and germination of some improved cowpea seeds. Nigerian Journal of Entomology, 31: 161-167