E.A. Adesegun , O.S. Adebayo, A.K. Akintokun
The production of tomato (Lycopersicon esculentum Mill.) is severely limited by the Southern blight disease caused by Sclerotium rolfsii, inducing a yield loss of about 60%. The major means of control is the use of chemicals which have been phased out due to its associated hazards, hence the need for alternatives particularly in botanicals for its control. Five spices - Xylopia aethiopica, Cymbopogon citratus, Allium sativum, Aframomum melegueta and Ocimum gratissimum extracts were tested in vitro at six concentrations (0, 1, 2, 3, 4, 5%) against the growth of S. rolfsii. To further evaluate disease control, extracts of the five spices were tested in the screen house for disease control. Results of the in vitro study show inhibition of S. rolfsii by all spices extracts at 3, 4, and 5%, in the following descending order: X. aethiopica > A. sativum > O. gratissimum > C. citratus > A. melegueta. However, in the screen house trial, significant reduction in disease severity was recorded in extracts treated tomato plants, in the following decreasing order: O. gratissimum, C. citratus, A. melegueta, A. sativum, X. aethiopica. The highest disease control ability was recorded in all extracts at 5% concentration. The study demonstrates the potentials of these spices for the control of Southern blight of tomato.
Adesegun , E.A., Adebayo, O.S. and Akintokun, A.K. (2012). ANTIFUNGAL ACTIVITY OF SPICES EXTRACTS AGAINST SCLEROTIUM ROLFSII. Acta Hortic. 933, 415-419
DOI: 10.17660/ActaHortic.2012.933.53
Afframomum melegueta, Allium sativum, disease control, Ocimum gratissimum, tomato, Xylopia aethiopica

Acta Horticulturae