Journal of Food, Agriculture and Environment

Leafspot disease of taro cocoyam (Colocasia esculenta (L.) Schott) caused by Botryodiplodia theobromae and in-vitro control with some agrochemicals

Author(s):

E. M. Ilondu

Recieved Date: 2013-07-22, Accepted Date: 2013-10-30

Abstract:

Fungi associated with leafspot disease of taro cocoyam (Colocasia esculenta (L.) Schott) in naturally infected farms at Ora-Eri, Aguata L. G. Area of Anambra State were investigated. The isolation study was conducted in the laboratory using Potato Dextrose Agar medium. The fungi identified with their percentage frequency of occurrence included Humicola fusco-atra (11.11%), Botrydiplodia theobromae (36.61%) Fusarium solani (15.03%), Fusarium moniliforme (16.34%) and Gliomastrix cerealis (20.92%). Only B. theobromae produced leafspot lesions when healthy cocoyam leaves were inoculated with the spore suspension of the fungi in the pathogenicity tests. Three commercial fungicides (Benlate, Mancozeb and Ridomil plus) at the concentrations of 10 - 5000 ppm were evaluated for their in-vitro effect on the mycelial growth of B. theobromae seven days after inoculation in pre-amended Potato Dextrose Agar medium. The fungicides showed a variable response in inhibiting the growth of the pathogen with a dosedependent effect. B. theobromae was 100% sensitive to Benlate at 1000 ppm, Mancozeb at 3000 ppm and Ridomil plus at 5000 ppm. The results of this study will be helpful to adopt most suitable fungicidal application to curb leafspot disease occurrence in cocoyam farms.

Keywords:

Leafspot, Colocasia esculenta, Botryodiplodia theobromae, agrochemicals

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Agriculture
Pages: 1404-1408

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