Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Lasiodiplodia theobromae causing branch blight on avocado in China.

Abstract

During February 2019, approximately 20[%] of the avocado cv. Hass trees (3 years old) showed an unknown branch blight on a plantation of about 15 ha in Danzhou (Hainan, China). Initial disease symptoms on branches were irregular, tan, water-soaked lesions, which enlarged and coalesced, covering larger (5 cm) areas of the branches. Lesions showed abundant small black spots (pycnidia) and also white powder as time progressed. Xylem of the branches became dark brown. At later stages of the disease the branches dried up. the causal pathogen was isolated and identified as Lasiodiplodia theobromae based on morphological, molecular and pathogenicity analyses. The obtained sequences were deposited in GenBank under accession numbers MT093434, MT111570 and MT111571. This is thought to be the first report of L. theobromae attacking avocado in China.