First report of mango ( Mangifera indica ) stem-end rot caused by two Diaporthe species and their susceptibility to procymidone

In July 2013, a severe postharvest rot of mango fruits (cv. Lippens), with symptoms identical to stem-end rot caused by Lasiodiplodia theobromae or Neofusicoccum parvum , was found in Okinawa Prefecture, Japan. From affected fruit, Diaporthe species were consistently isolated. The isolates reproduced the original symptoms in healthy mango fruits after inoculation and were re-isolated from the inoculated fruits. Based on morphology and a phylogenetic analysis of rDNA-ITS, CAL , H3 , EF1-α , and TUB , the isolates were classified into two Diaporthe species (Clade I and Clade II). In terms of susceptibility to procymidone, a registered fungicide against mango stem-end rot in Japan, the two Diaporthe species were less sensitive than previously reported mango stem-end rot pathogens and had MIC and EC 50 values higher than the standard concentration applied.