Evaluation of Industrial Hemp Seed Treatments for Management of Damping-Off for Enhanced Stand Establishment

Hilary Mayton, Masoume Amirkhani, Michael Loos, Burton Johnson, John Fike, Chuck Johnson, Kevin Myers, Jennifer Starr, Gary C. Bergstrom and Alan Taylor
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Hilary Mayton: Cornell AgriTech, School of Integrative Plant Science, Horticulture Section, Cornell University, Geneva, NY 14456, USA
Masoume Amirkhani: Cornell AgriTech, School of Integrative Plant Science, Horticulture Section, Cornell University, Geneva, NY 14456, USA
Michael Loos: Cornell AgriTech, School of Integrative Plant Science, Horticulture Section, Cornell University, Geneva, NY 14456, USA
Burton Johnson: Department of Plant Sciences, The College of Agriculture, Food Systems, and Natural Resources, North Dakota State University, Fargo, ND 58108, USA
John Fike: School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA
Chuck Johnson: Southern Piedmont Agricultural Research and Extension Center, Virginia Tech, Blackstone, VA 23824, USA
Kevin Myers: School of Integrative Plant Science, Plant Pathology and Plant-Microbe Biology Section, Cornell University, Ithaca, NY 14853, USA
Jennifer Starr: School of Integrative Plant Science, Plant Pathology and Plant-Microbe Biology Section, Cornell University, Ithaca, NY 14853, USA
Gary C. Bergstrom: School of Integrative Plant Science, Plant Pathology and Plant-Microbe Biology Section, Cornell University, Ithaca, NY 14853, USA
Alan Taylor: Cornell AgriTech, School of Integrative Plant Science, Horticulture Section, Cornell University, Geneva, NY 14456, USA

Agriculture, 2022, vol. 12, issue 5, 1-12

Abstract: The purpose of this research was to collect efficacy data on biological, biochemical, and chemical fungicide seed treatments on hemp ( Cannabis sativa L.) to mitigate damping-off and enhance field stand establishment. Seed treatments were evaluated in fields in New York (NY), North Dakota (ND), and Virginia (VA) and at two planting dates in each state in 2020. A single seed lot of a dual-purpose (fiber + grain) cultivar (‘Anka’) was treated using a laboratory-scale rotary pan coater. Five biological, two biochemical, and four chemical seed treatments were tested. A laboratory germination test revealed that seed treatments did not exhibit phytotoxicity when compared to the non-treated control. A laboratory bioassay with naturally infested soil was used to assess the preliminary activity of seed treatments for protection against damping-off. The biochemical seed treatment Ultim ® (active ingredient; organic copper) performed as well as the chemical treatments Apron XL ® + Maxim ® 4FS and Mertect ® 340F in preventing damping-off whereas the biological treatments did not differ from the non-treated control in terms of disease incidence. In all field tests, biological seed treatments did not improve plant stands compared to the non-treated control. Biochemical seed treatments Prudent 44 ® with Nutrol ® (active ingredient; phosphite) and Ultim ® , along with chemical seed treatments, had acceptable efficacy and improved stand establishment compared to the non-treated control across field locations. Based on efficacy results from laboratory and field trials, the copper seed treatment has potential for both conventional and organic hemp production.

Keywords: biopesticides; biological control; Pythium; Cannabis sativa L.; organic copper; phosphite (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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