Evaluation of advanced Cowpea
lines for agronomic traits, yields,
and response to cowpea scab
caused by Sphaceloma spp.
Authors:
Amayo R., Omadi J.R. Okwang D. and Obuo J.P
Dry Land Legume Research Program
National Semi-Arid Resources Research Institute (NaSARRI),
Serere
Content of the Presentation
 Research Background
 Research Objective
 Materials and methods
 Results / Research outcome
 Conclusion and Recommendation
 Acknowledgement
Research Background
Cowpea (a poor man’s meat), is an
economically important legume crop grown
widely in the Semi-Arid regions.
Fresh pods
Quality grains
Fresh pods read for market
Cowpea flour
Fresh pod meal
Cowpea bread
Background Cont’d
The major constraints to production and
productivity of cowpea
Storage pests
Cowpea aphid
Foliar chewing pests
Cowpea leaf blight
Cowpea scab
Research Objective
This study was designed to contribute to
enhancement of cowpea production through
screening cowpea lines for different crop
attributes including agronomic performance,
pod and grain yield, and resistance/tolerance
to cowpea scab.
Materials and methods
Eleven (11) cowpea lines comprising four improved
local varieties and seven promising lines were
evaluated.
Field evaluations for yield and growth attributes were
carried out in the second rains of 2010, the two rain
seasons of 2011 and in the first rain of 2012
Materials and methods
FIELD RESISTANCE / TOLERANCE TRIALS
Research Results
Average Means of the agronomic traits of the promising cowpea lines in
relation to SECOW 2W measured in 2010 and 2011 growing seasons
Means
Number of Branches
Days to 50% flowering
Days to 75% Podding
2011
average
2010
2011
average
2010
2011
Average
2010
2011
Average
33.12 32.37
32.74
5
5
5
44
45
45
54
54
54
77
77
77
23.0
ACC25
35.20 34.30
34.75
6
5
6
47
48
48
56
56
56
78
77
78
21.0
NGOJI
43.54 44.47
44.01
5
5
5
45
45
45
54
55
56
73
73
73
19.0
ACC23
44.12 44.33
44.23
5
5
5
45
46
46
56
56
56
74
74
74
18.0
ACC26
42.60 41.57
42.08
6
6
6
44
44
44
54
55
55
77
77
77
23.0
SECOW
2W
37.86 38.20
38.03
5
5
5
46
46
46
56
57
57
76
76
76
20.0
ACC12
34.56 35.50
35.03
7
6
7
44
43
44
57
56
57
76
76
76
19.0
ACC2
35.82 36.10
35.96
6
5
6
44
44
44
54
54
54
75
75
76
21.0
F. Pr.
0.006 0.008
0.014
ns
Ns
Ns
ns
ns
ns
ns
ns
ns
0.05
0.015
0.02
0.002
%CV
2.8
4.2
2.1
2.8
2.4
2.1
2.5
3.2
2.8
2.3
1.9
2.4
1.1
1.0
0.9
6.6
SED
1.98
3.07
2.04
0.84
0.42
0.41
4.51 3.36
2.5
1.57 0.86
1.2
0.90
1.04
0.5
1.21
2011
ACC11
2010
2010
Days to 95% Maturity
Mat
period
average
Treatments
Plant Height (cm)
Results cont’d
Average Means of the yield components and grain yield of the promising
cowpea lines in relation to SECOW 2W measured in 2010 and 2011
growing seasons
Treatment
s
Means
Number of seeds/pod
2010 2011
averag
e
14
13
14
100 seed weight (g)
Grain yield Kg/Ha
2010 2011
average 2010 2011
Average
ACC11
Pod length (cm)
Number of pods/plant
2010 2011
average 2010 2011
averag
e
13.43 11.87
12.65
45
38
42
10.67 7.90
9.28
1,759 1,218
1,488
ACC25
17.37 16.07
16.72
42
39
41
16
17
17
15.00 15.20
15.10
2,870 1,759
2,314
NGOJI
18.13 14.50
16.32
47
40
44
17
18
18
15.33 11.37
13.35
2,361 1,620
1,990
ACC23
17.87 15.20
16.54
40
39
40
18
17
18
15.67 11.77
13.72
2,222 1,319
1,770
ACC26
12.80 15.27
14.04
42
28
35
13
12
13
16.67 15.87
16.27
2,616 1,782
2,199
SECOW
2W
ACC12
16.83 15.90
16.36
41
32
37
15
15
15
15.67 10.73
13.2
2,014 1,852
1,933
16.90 14.27
15.58
41
30
36
16
16
16
11.52 9.63
10.57
1,528 926
1,227
ACC2
13.50 14.02
13.76
42
31
37
16
17
17
15.00 15.03
15.01
1,991 1,435
1,713
F. Pr.
0.002 0.002
0.002
ns
Ns
ns
0.003 0.020
0.008
0.006 <0.001
<0.001
0.017 0.05
0.05
%CV
1.8
1.6
1.5
1.0
1.7
2.1
2.1
1.1
1.3
2.7
5.2
3.1
7.9
8.3
SED
1.24
0.79
0.88
1.86
2.75
1.78
0.84
1.66
1.4
0.88
0.98
0.76
322.9 483.2
11.8
286.3
Results cont’d
Differences in weather condition in 2010, 2011and 2012
growing seasons
Mean Temperature
( ̊C)
Mean Rainfall (millilitres)
Year
2010
2011
2012
2010
2011
2012
1st Season
-
78.28
76.04
-
23.1
25.45
2nd Season
102.37 130.72
-
24.5
22.2
-
Results cont’d
Conclusions
Majority of the promising lines were either erect or
semi-erect
Only two promising lines (ACC25 and ACC26) that
out yielded SECOW 2W
Cowpea lines (SECOW 3B, SECOW 4W, SECOW
2W, ACC11, ACC12 and ACC2 that showed good
resistance response
Acknowledgement
ATAAS / WORLDBANK
GoU
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