Abstract
Preliminary investigation into the nursery diseases of Vitellaria paradoxa in the Nigerian Institute fo r Oil Palm Research substation, Bida, Niger state, revealed mainly the presence of leaf pustules and leaf blight disease. Symptoms of the leaf pustules disease results in a total defoliation of the leaves of the plant while that of the leaf blight is characterized by fire burnt edges around most of the leaves in a single seedlings or shrub. Mic roorganisms isolated from the infected leaf samples using the direct plating techniques on potato dextrose agar include Pestalotiopsis clavispora and Botryodiplodia (Lasiodiplodia spp) from the leaf pustules while P. clavisp ora and Pseudocochliobolus eragrostidis were isolated from the leaf blight. The result of the effect of the fungici des captan, benlate dithane M-45and difolatan at 500 and 250ppm on the in-vitro mycelia growth of P. clavispo ra and P. eragrostidis for a test period of nine days shows benlate at 500ppm to completely inhibit the mycelia g rowth of P. clavispora and P. eragrostidis. The fungicide dithane did not completely inhibit the pathogens at sa me concentration of 500 and 250ppm. The mode of action of the fungicide benlate on P. clavisopra and P. eragr ostidis was fungicidal. It's therefore recommended that the fungicide benlate be used for field trials.
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