First report of Golovinomyces cichoracearum sensu lato on Cannabis sativa in Israel

New disease reports

article

M. Maymon¹  S. Jerushalmi and S. Freeman¹ 

[1] Department of Plant Pathology and Weed Research, Agricultural Research Organization, The Volcani Center

关键词: hemp;    medical cannabis;    pathogens;    plant disease;    powdery mildew;   

DOI  :  10.5197/j.2044-0588.2020.042.011

学科分类：生物科学（综合）

来源: British Society for Plant Pathology

【 摘 要 】

In recent years, the use of cannabis (Cannabis sativa) has gained popularityfor medical and other purposes, and its cultivation worldwide has expandedrapidly (Ruchlemer et al., 2015; Jerushalmi et al., 2020).During April 2020, symptoms of powdery mildew were observed oncommercially cultivated medical cannabis in the greenhouses of severalfarms in Israel, causing serious concerns, since affected material wasdiscarded, deemed unfit for medical consumption. Symptoms initiallyappeared as small, white circular patches of epiphytic mycelia with conidiaon the upper sides of mature leaf surfaces, similar to those described byPépin et al. (2018). As the disease progressed, colonies expanded in size,coalescing and covering entire leaf surfaces, succulent stems andinflorescences (Fig. 1). Conidia were produced in chains on conidiophoresthat were single and erect, unbranched and cylindrical, arising from thecolonies (Fig. 2). The conidia were hyaline, cylindrical to ellipsoid in shape,measuring 38.8-45.4 µm in length and 15.9-21.1 µm in width (Fig. 3). Nochasmothecia were observed.

【 授权许可】

CC BY