Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Alternaria alternata causing leaf spot of Aloe vera in China.

Abstract

In May 2016, leaf spots were observed on potted Aloe vera plants in Hunan Province, China. Symptoms primarily displayed as water soaked spots forming dark brown, circular to oval, necrotic sunken spots on both surfaces of the leaves, occasionally surrounded by yellowish haloes. When leaves were severely infected, they became withered from the tip downward. Based on morphological characteristics, molecular data (sequence analysis of the rDNA internal transcribed spacer region, a portion of translation elongation factor 1-α gene, the endo-polygalacturonase gene, glyceraldehyde-3-phosphate dehydrogenase and Alt a 1 major allergen gene) and pathogenicity tests, the causal agent was identified as Alternaria alternata. This is thought to be the first report of Alternaria alternata causing leaf spot on Aloe vera in China. The disease has been reported and caused damage in several countries such as the USA, Iran, Pakistan and India.