Effects of Plant Extracts on the Growth and Yield of Cowpea (Vigna ungnicnlatu (L.) Walp) infested with Root-knot nematode (Mehridogyne incognita Race 2):- Nzenwa. Peter O

ABSTRACT

Six Cowpea varieties (IT89KD — 391, 1T89KD — 288, 1F86KD - 719, IAR 48. I f assessed for resistance against root-knot nematode field naturally infested with Meloidogyne incognita. Three varieties were resistant,two were tolerant and one was rated susceptible experiment with plant extracts in the greenhouse and field. The experiments were laid out in a Completely Randomized Design (CRD) and Randomized Complete Block Design (RCBD) with 14 treatments; (Hot water extracts (UWE) and Cold water extracts ol (CWE) of Capsicum frutescens, Afromomum melegueta, Xylopia actiopica, Occimum grattissimum. Nicotiana tabacum, Piper guinense, Lambdacyhalothrin and I control) replicated 3 times. The result of the greenhouse experiment showed that HWE O. grattisimum, HWE and CWE ofA. melegueta and HWE / aetiopica significantly increased yield (<0.05) and suppressed did not differ significantly with the synthetic insecticide-Lambdacy/udolhrin. The leaf by local farmers. xii rnematode build up in the field. The aqueous extracts reduced the number of galls on the roots, nematode populations in the root and soil samples. The results obtained with these extracts 89KD) - 485 and Sokoto Local) were respectively. The susceptible cowpea variety (IT89KD-288) was selected for control disease on cowpea in the greenhouse and a extracts of the test plants could therefore be harnessed as sources of natural nematicides of plant origin to control t