Nematicidal Effects Of Some Plant Extracts On Egg Hatchability And Control Of Meloidogyne SPP. In Cowpea (Vigna Unguiculata (L.) WALP.)

ABSTRACT

The effects of cold and hot aqueous extracts of 5 test plants (Luffa cylindrica, Momordica charantia, Euphorbia hirta, Desmodium scorpiurus and Stachytarpheta cayennensis), wood ash, a synthetic nematicide (karate-Lambdacyhalothrin) and a tap water treated control were evaluated against the egg hatchability and control of Meloidogyne spp in cowpea (Vigna unguiculata (L.) Walp) in the laboratory and green house. The experiments were laid out in a completely randomized design (CRD) with 13 treatments; (Hot water extracts (HWE) and cold water extract (CWE) of L. cylindrica; E. hirta, D. scorpiurus, S. cayennensis, wood ash, karate (Lamdacylalothrin) and control) replicated 3 times. The result of the laboratory experiment showed that the hot and cold water extracts of L. cylindrica, and HWE of M. charantia, significantly (p < 0.05) inhibited the hatching of eggs of the pathogen. Result obtained from the Green house experiments indicated that HWE of E. hirta, CWE of S. cayennensis and CWE and HWE of L. cylindrica significantly increased yield, (P< 0.05). 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 did not differ significantly with the synthetic nematicide (Karate - /ambdacyhalothrin ). The leaf extracts of the test plants could therefore be harnessed as source of nematicides of plant origin to control th d · ·ffe ·t fplant parasitic nematodes in cowpea field by local farmers.