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 4 Host reaction, host resistance/susceptibility, and host category of field pea as affected by root-knot nematode, Meloidogyne incognita infection

Pea cultivars	Average %Red. of yield	%Red. Potential of yield (A)	Average %Red. of plant growth	%Red. potential of plant growth (B)	Average %Red. potentials of A+B	Host reaction*	Host resistance/susceptibility	Host category**
Cerdon	41.2	74.9	9.4	37.3	56.1	HA	LS	Intolerant
Concessa	24.1	43.8	18.2	72.2	58.0	HA	HS	HS
Diacole	15.6	28.4	15.0	60.0	44.2	MA	MS	MS
Samantha	28.0	50.9	24.3	96.4	73.7	HA	LS	Intolerant
337	55.0	100.0	25.2	100.0	100.0	HA	LS	Intolerant

*20–50.9% average %Red. Potential = moderately affected (MA); 51–100% = highly affected (HA)
**HA or MA +HS = highly susceptible (HA); MA+MS = moderately susceptible (MS); HA+LS = intolerant. Percent yield reduction potential was calculated by dividing the percentage reduction of plant growth or yield of a given cultivar on the percent reduction of the highest one (cultivar) multiplied by 100. Red.= reduction