The co‐occurrence of two powdery mildew species on Cannabis sativa in the Czech Republic

In late summer 2022 and 2023, powdery mildew symptoms were found on female plants of hemp (Cannabis sativa) growing in a private garden in Hradec nad Moravicí (Silesia, Czech Republic). On the upper sides of the leaves, white powdery colonies were observed which coalesced and finally covered the who...

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Bibliographic Details
Published in:Journal of phytopathology 2024-05, Vol.172 (3), p.n/a
Main Authors: Mieslerová, Barbora, Kitner, Miloslav, Šenkyřík, Josef Baltazar, Křivánková, Tereza, Sedlářová, Michaela, Braun, Uwe, Lebeda, Aleš
Format: Article
Language:English
Subjects:
anamorph
epidemiology
Golovinomyces ambrosiae
hemp
ITS
Podosphaera macularis
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Summary:In late summer 2022 and 2023, powdery mildew symptoms were found on female plants of hemp (Cannabis sativa) growing in a private garden in Hradec nad Moravicí (Silesia, Czech Republic). On the upper sides of the leaves, white powdery colonies were observed which coalesced and finally covered the whole leaf surface. The stems and flowers were not affected. Microscopic examination revealed the formation of asexual (anamorphic) states characterized by conidiophores forming catenescent conidia (Euoidium type), but with two types of conidia, viz., ellipsoid to ovoid or doliiform conidia with fibrosin bodies (resembling conidia of Podosphaera spp.), and ellipsoid to doliiform conidia without fibrosin bodies (resembling conidia of Golovinomyces spp.). Molecular genetic analyses confirmed co‐infections in the studied hemp samples by two powdery mildew species, viz., Podosphaera macularis and Golovinomyces ambrosiae, which represent first records from the Czech Republic, as well as Europe and in the world. The authors discuss the latest information and ideas regarding this pathosystem.
ISSN:0931-1785
1439-0434
DOI:10.1111/jph.13348