Prescreening of Biological and Biorational Fungicides Against Common Hemp Pathogens Using In Vitro Analyses

Ed Dixon, Kimberly Leonberger, Desiree Szarka, Bernadette Amsden, Henry Smith, Matthew Krause, Nicole Gauthier

Research output: Contribution to journalArticlepeer-review


Upon reintroduction of hemp in 2014 and legalization in 2018, labeled pesticides have remained limited. Further, consumer demand has aimed the market toward organic or chemical-free production systems. In efforts to manage diseases and pests in fields and greenhouses, producers turn toward biological and biorational formulations. Efficacy of these fungicides against common aerial diseases of hemp is largely unpublished. Challenges of efficacy testing, however, further delay or discourage research. In this study, we evaluated screening methods against some common biological products. The aim was to test a screening model in order to examine products against fungal pathogens and to identify demonstrable differences under controlled conditions. Thus, in this study, we prescreen 11 biological and biorational fungicides against four common fungal leaf and flower pathogens using three bioassays.

Original languageEnglish
Pages (from-to)250-255
Number of pages6
JournalPlant Health Progress
Issue number3
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 The American Phytopathological Society


  • Biological control
  • Bipolaris leaf spot
  • Botrytis tip blight
  • Cannabis sativa
  • Cercospora leaf spot
  • Leaf spot
  • Omri
  • Organic
  • Septoria leaf spot

ASJC Scopus subject areas

  • Plant Science
  • Horticulture


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