Invasive Species Compendium

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Abstract

First report of Colletotrichum gloeosporioides causing anthracnose spot on Cassia fistula in Brazil.

Abstract

Since January 2015, a new leaf spot has been observed on Cassia fistula trees in several counties of Rio Grande do Sul, Brazil. The first symptoms of disease occurred in early spring and became aggravated in summer, causing leaf fall. In the urban area of Arroio do Tigre, the disease affected ∼80% of the arborization trees. Symptoms appeared as light brown circular lesions with dark centres measuring 0.5-1.5 cm in diameter. In addition, the lesions had a well delimited dark halo. As the disease progressed, these spots coalesced and caused premature senescence of the leaves, reducing their ornamental value. The causal pathogen was isolated and identified as Glomerella cingulata based on morphological, molecular and pathogenicity analyses. This is thought to be the first report of this pathogen causing anthracnose on C. fistula in Brazil.