First report of taro (Colocasia esculenta) leaf blight caused by Phytophthora colocasiae in Nigeria.
In November 2009, taro plants (Colocasia esculenta) in Abia State, Nigeria were observed to have small brown, water-soaked lesions that rapidly enlarged to form large, dark brown, coalescing lesions, sometimes with orange host exudations. Sporangia from detached and attached inoculated leaves, when plated on selective medium, produced typical symptoms of Phytophthora colocasiae colonies. A BLASTn search revealed 99% similarity to a P. colocasiae strain of the Pacific region (Accession No. GU111604), but only 94% similarity to a P. colocasiae strain from India (Accession No. GQ202149). The sequence analysis, morphological characteristics, and pathogenicity tests confirmed the taro leaf blight pathogen as P. colocasiae. This is thought to be the first report of P. colocasiae causing taro blight in Nigeria.