First Report of Phytophthora cambivora Causing Leaf and Stem Blight and Root Rot on Taiwan Cherry (Prunus campanulata) in Taiwan

摘要

In May 2011, a crown rot disease was observed in wheat cv. Aikang 58 in a wheat-maize rotation, irrigable and loam field in Henan province, China. Diseased wheat plants showed honey brown discoloration in the stem bases and whitehead in some plants, which are symptoms of crown rot with about 70% incidence in a surveyed field. PCR products of the isolates were sequenced (GenBank Accession Nos. JN862232 to JN862235). Phylogenic analysis of the sequence indicated that the isolates were identified as Fusarium pseudograminearum [Gibberella coronicola]. Pathogenicity tests were conducted and the fungus was reisolated from inoculated plants, fulfilling Koch's postulates. This is thought to be the first report of F. pseudograminearum causing crown rot of wheat in China.