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

Table 2

Combined analysis of variance for five genotypes across 18 locations.

Source of variation	d.f.	Mean square value
		Seedling mortality	Vigour
Genotype	4	370605.71	255.966
Location	17	9.83 ns	0.1398 ns
Genotype × location	68	15.64 ns	0.1752 ns
Residual	720	13.83	0.1593

Note. ns = not significant at 5% probability level. Significant at 5% probability level.