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Eucalyptus    spp. are widely planted in Colombia as an important component of a growing paper and pulp industry. Leaf and shoot blight caused by    Calonectria    spp. was one of the first disease problems to emerge in these plantations. A survey of    Eucalyptus    plantations in four forestry regions of Colombia during 2016 resulted in a large number of    Calonectria    isolates from soil samples collected in the understories of trees having symptoms of    Calonectria    leaf and shoot blight. The aim of this study was to identify and resolve the phylogenetic relationships for these isolates using DNA sequence comparisons of six gene regions as well as morphological characters. From a collection of 107 isolates, seven    Calonectria    species residing in three species complexes were identified. Two of these represented undescribed species, namely    C.   exiguispora    sp. nov.  and    C.   guahibo    sp. nov.    Calonectria   parvispora    and    C.   spathulata    were the most commonly isolated species, each of which accounted for approximately 30% of the isolates. The results suggest that Colombia has a wide diversity of    Calonectria    spp. and that these could challenge    Eucalyptus    plantation forestry in the future.

﻿Soil-borne Calonectria ( Hypocreales , Nectriaceae ) associated with Eucalyptus plantations in Colombia

Soil-borne Calonectria ( Hypocreales , Nectriaceae ) associated with Eucalyptus plantations in Colombia