First report of leaf blight disease on Lanzhou lily (Lilium davidii var. unicolor) caused by Botrytis cinerea in China.
In the summer of 2017, leaf blight symptoms were observed on Lanzhou lily (Lilium davidii var. unicolor) in Gansu, China, resulting in approximately 30-40% loss of bulb production in continuous cropping fields. The infection initially manifested as elliptical or irregular oval lesions on the leaves, which gradually expanded and coalesced into blight of grayish brown. Infection often started on the leaf tips and progressed to the base of leaves as symptoms developed. Severely infected leaves were wilted and covered with gray mycelium and conidia, especially under humid conditions. The causal pathogen was isolated and identified as Botrytis cinerea based on morphological characteristics, molecular data (sequence analysis of the internal transcribed spacer region (ITS) of the ribosomal DNA and glyceraldehyde 3-phosphate dehydrogenase (G3PDH) gene) and pathogenicity test. This is thought to be the first report of B. cinerea causing leaf blight disease on edible Lanzhou lily in China and globally.