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First detailed report of Trichothecium roseum causing post-harvest pink rot of avocado in Israel.

Sharma, G. ; Maymon, M. ; Freeman, S.

Plant Disease 2016 Vol 100 No. 4 pp. 856;

Abstract

Avocado (Persea americana) is widely cultivated throughout Israel, with the coastal plain and eastern valleys of Upper Galilee comprising the major growing areas. During sample collection of unripe avocado fruits (cv. Hass) from northern and central Israel in November 2014, profuse salmon-coloured sporulation was observed on the skins of fruits during the ripening process. A fungal pathogen was isolated from the infected fruits and 4 single-spored isolates were selected for further characterization. Based on morphological characteristics, molecular data (DNA sequencing of the 5.8S rRNA gene and the flanking internal transcribed spacer regions) and pathogenicity tests, the fungus was identified as T. roseum. T. roseum is well known as an opportunistic wound pathogen of avocado, and thus far, pink rot disease in avocado has been reported only in New Zealand. Although T. roseum has previously been observed along with other avocado pathogens such as Botryosphaeria spp. and Colletotrichum spp. in Israel, the original occurrence of T. roseum was saprophytic and/or opportunistic. This is thought to be the first detailed report of T. roseum causing postharvest pink rot of avocado in this country.