Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Botrytis blight caused by Botrytis cinerea on Anemone japonica in Italy.

Abstract

In September 2014, symptoms of a previously unknown blight were observed on 2- to 5-year-old Anemone hupehensis var. japonica plants in a private garden near Biella, northern Italy. Affected leaves showed first chlorotic then necrotic spots that enlarged, became irregular, water-soaked and brown, often with petal dropping. Infected petals withered and turned tannish brown, often sticking together. Severely infected tissues eventually became completely rotted and later desiccated. Infection also spread through the leaf petiole. A soft and gray mycelium was observed on symptomatic tissues. The disease affected 10-25% of plants in late August-early September and 40-60% in October (10-15°C). Generally, in the garden infected flower parts served as an inoculum source for leaf infection. The causal pathogen was identified as Botrytis cinerea based on morphological, genetic (ITS) and pathogenicity analyses. This is thought to be the first report of B. cinerea on Anemone hupehensis var. japonica in Italy and worldwide.