Stability of Sources of Resistance to Cowpea Aphid (Aphis craccivora Koch, Hemiptera: Aphididae) across Major Cowpea Production Zones in Ghana

Table 5

Effect of aphid infestation on biomass yield of cowpea cultivars/genotypes.

Cultivar/genotype	Biomass yield (kg/ha)			95% CI of mean difference (infested–uninfested)
	Uninfested	Infested	% yield loss
Apagbaala	3236 ± 74.88	2942 ± 75.45	9.1	−643.1–54.3 ns
SARC1-57-2	3667 ± 88.58	3444 ± 73.79	6.1	−547.9–103.5 ns
SARC1-91-1	3439 ± 130.17	3117 ± 117.38	9.4	−603.5–40.9
IT97K-499-35 (Songotra)	3719 ± 54.05	3367 ± 47.22	9.5	−894.1–188.5
Zaayura	4900 ± 94.42	4211 ± 98.95	14.1	−1784–406.6 ns
Resistant BC4F3 (Zaayura//(Zaayura × SARC1-57-2))	5028 ± 115.87	4864 ± 29.08	3.3	−317.3–10.4
Susceptible BC4F3 (Zaayura//(Zaayura × SARC1-57-2))	4528 ± 44.67	3972 ± 119.67	12.3	−1094–17.4
IT99K-573-1-1	3528 ± 86.00	3214 ± 84.95	8.9	−680–52.4 ns
IT99K-573-3-2-1	3278 ± 75.45	2808 ± 84.59	14.3	−792.0–146.9
Padituya	4947 ± 78.37	4428 ± 74.09	10.5	−992.7–46.17
Mean	4027	3637

Note. Data are means ± standard error of means; CI = confidence interval. CI of mean difference is significant at 5% probability threshold level (i.e., mean differences that do not include zero are significantly different).