A detached leaf assay was validated as a fast, non-destructive method to screen cannabis varieties for Botrytis susceptibility and evaluate treatment products.
Cannabis cultivators, plant pathologists, and agricultural product development researchers.
pH-dependent efficacytreatment performance varied with pH, emphasizing optimal application conditions for disease control
What the researchers found
The detached leaf assay effectively differentiated eight hemp varieties for Botrytis susceptibility and identified potassium salt-based treatments as effective alternatives to conventional fungicides, with results comparable to whole-plant testing.
Why it matters
Medical cannabis patients often have compromised immune systems, making fungicide residue-free products essential. This screening method accelerates identification of disease control options.
The numbers in context
8 industrial hemp varieties tested. Tau-fluvalinate, Myclobutanil, and potassium salts showed consistent lesion reduction. Treatment performance was pH-dependent.
How the study worked
Detached leaf bioassay comparing varietal susceptibility to Botrytis cinerea infection and screening chemical/organic products for disease control efficacy.
Who was studied
Eight industrial hemp (Cannabis sativa) varieties in greenhouse production.
What this study cannot tell us
Detached leaf may not capture systemic plant defense responses. Industrial hemp varieties may differ from medicinal cannabis cultivars. Greenhouse conditions tested.
How to read the evidence
Well-designed agricultural screening study with validated methodology against whole-plant comparisons.
When this study was published
Recent agricultural research for medical cannabis production.
The bigger picture
This practical screening tool fills a critical need in the medical cannabis industry, where fungicide options are limited by residue concerns for immunocompromised patients.
Replication
Validated against whole-plant testing; applicable across cannabis cultivation settings.
Funding
Not specified in abstract
Conflicts of interest
Not specified in abstract
Questions still open
- Can this assay be standardized for regulatory use across cannabis cultivation facilities?
- Do potassium salt treatments maintain efficacy under commercial production conditions?
Read the original research
Using Detached Industrial Hemp Leaf Inoculation Assays to Screen for Varietal Susceptibility and Product Efficacy on Botrytis cinerea.
Plants (Basel, Switzerland), 12(18)
Citation
Kirkby, Karen; Roser, Sharlene; Plett, Krista. (2023). Using Detached Industrial Hemp Leaf Inoculation Assays to Screen for Varietal Susceptibility and Product Efficacy on Botrytis cinerea.. Plants (Basel, Switzerland), 12(18). https://doi.org/10.3390/plants12183278