Cocoyam (Colocasia esculenta L). is an important edible tuber crop, but taro leaf blight caused by Phytophthora colocasiae has been the greatest constraint to cocoyam production in Nigeria since 2009. Field trials were conducted to determine the effect of fungicides and the spray regimes on leaf growth, disease incidence, disease severity and tuber yield of cocoyam. The trials were carried out at the

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Synthetic chemicals have been used to control plant pathogenic nematodes in the farmers fields. These chemicals, though valued for their effectiveness, are costly and may constitute health hazards to farm households and the environment. Reducing these situations in the farms through use of natural plant extracts is one of the challenges in Nigeria. Powdery extracts of Jatropha curcas, Parkia biglobosas, Newbouldia laevis, Ficus exasperata and Cassia alata were evaluated for the control of M. incognita in yam bean (Sphenostylis stenocarpa Hochst ex A. Rich) at the University of Nigeria, Nsukka in Nigeria. Newbouldia laevis extract significantly (P<0.05) controlled the galling of Meloidogyne incognita, while the efficacy of other extracts were insignificant (P >0.05). Newbouldia laevis extract had significant effects on the height of the plant. Significant difference was observed on the plants height. Newbouldia laevis extract reduced the number of galls from 1.89 to 1.18 and increased the height from 106.1 to 213.3 cm and the number of leaves from 59.2 to 69.2 compared with control (water treatment). Cassia alata extract had a significant effect on both leaf numbers and stem height of the plant. It increased the number of the leaves from 59.2 to 81.3 and the height from 196.1 to 201.3 cm, and the number of root gall from 1.89 to 2.49.

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