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 1 Host suitability of different cultivars of field pea in response to root-knot nematode, Meloidogyne incognita infection

Pea cultivars	Nematode parameters						Rate of host resistance/ susceptibility
Pea cultivars	J₂ in soil/pot	No. of galls	No. of eggmasses	Final nematode population	Build up (Pf/Pi¹)	Potential reproduction index (PRI)	Rate of host resistance/ susceptibility
Cerdon	2660 cd	13 ab	10 ab	2670 cd	4.45	36.9	LS
Concessa	7200 a	17 a	12 a	7212a	12.02	100.0	HS
Diacole	3340 b	14 ab	9 ab	3349b	5.58	46.4	MS
Samantha	2400 d	10 b	7 b	2407d	4.01	33.4	LS
337	2800 c	12 ab	8 b	2808c	4.68	39.0	LS

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), 41–50% PRI = moderately susceptible (MS), and 51–100% PRI = highly susceptible (HS)
Pf = final population, Pi = initial population