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Variation in response to root-knot nematode infection within the cowpea populations (a–d) CB27 × 24-125B-1 RIL, (e) IT84S-2049 × UCR779 F2:3, and (f) IT93K-503-1 × UCR779 F2:3 phenotyped in multiple tests with different RKN isolates (in parentheses). Mean phenotypic values for the parents in each test are indicated by labelled arrows. The number of RKN egg-masses per root system was measured in inoculated growth pouches. Root-galling was indexed in infested field plots
