Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of leaf spot caused by Myrothecium roridum on Coffea canephora in Brazil.

Abstract

In 2013 and 2014, leaves with a leaf spot were observed on most of the conilon coffee (Coffea canephora) seedlings in a commercial nursery in Laranja da Terra, Espirito Santo, Brazil. The initial symptoms were circular, brown to dark brown lesions with yellow margins occurring on both leaf surfaces. In high humidity, concentric rings formed and the lesions expanded rapidly to reach up to 30 mm in diameter, and later became dark brown with a grayish center. Black sporodochia with white, and marginal mycelial tuffs bearing black spore masses were observed in the older lesions. The causal pathogen was identified as Myrothecium roridum based on morphological, genetic (ITS) and pathogenicity analyses. This is thought to be the first report of a leaf spot caused by M. roridum on conilon coffee in Brazil.