Differential responses of certain field pea and cowpea cultivars to root-knot nematode, Meloidogyne incognita for commercial release

Bulletin of the National Research Centre

Table 5 Host suitability of three cultivars of cowpea to root-knot nematode, Meloidogyne incognita infection

Cowpea cultivars	Nematode parameters							Host resistance/susceptibility
Cowpea cultivars	No. of J₂ in soil/pot	No. of J₂ in roots	No. of galls	No. of eggmasses	Final nematode population	Build up (Pf/Pi¹)	Potential reproduction index (PRI)	Host resistance/susceptibility
Kafr El-Sheikh	11190 a	50 b	42 a	38 a	11278a	22.56	100.0	HS
Dokki	7200 b	53 b	35 b	16 b	7269 b	14.54	64.5	MS
331	4560 c	267 a	31 b	18 b	4845 b	9.68	43.0	MS

Values are means of 5 replicates
Values with the same letter(s) are not significantly different according to Duncan’s multiple range test at P ≤ 0.05. Potential reproduction index was calculated by dividing final population of a given cultivar on final population of the highest one multiplied by 100.Where 21–40.9%PRI = less susceptible (LS); 41–60.9%PRI = moderately susceptible (MS), and 51–100%PRI = highly susceptible (HS)
Pf/Pi¹ Pf= final population, Pi = initial population