<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The many decades during which the cultivation of <italic>Cannabis sativa</italic> (hemp) was strongly restricted by law resulted in little research on potential pathogenic nematodes of this increasingly important crop. The primary literature was searched for hemp-nematode papers, resulting in citations from 1890 through 2021. Reports were grouped into two categories: (i) nematodes as phytoparasites of hemp, and (ii) hemp and hemp products and extracts for managing nematode pests. Those genera with the most citations as phytoparasites were <italic>Meloidogyne</italic> (root-knot nematodes, 20 papers), <italic>Pratylenchus</italic> (lesion nematodes, 7) and <italic>Ditylenchus</italic> (stem nematodes, 7). Several <italic>Meloidogyne</italic> spp. were shown to reproduce on hemp and some field damage has been reported. Experiments with <italic>Heterodera humuli</italic> (hop cyst nematode) were contradictory. Twenty-three papers have been published on the effects of hemp and hemp products on plant-parasitic, animal-parasitic and microbivorous species. The effects of hemp tissue soil incorporation were studied in five papers; laboratory or glasshouse experiments with aqueous or ethanol extracts of hemp leaves accounted for most of the remainder. Many of these treatments had promising results but no evidence was found of large-scale implementation. The primary literature was also searched for chemistry of <italic>C. sativa</italic> roots. The most abundant chemicals were classified as phytosterols and triterpenoids. Cannabinoid concentration was frequently reported due to the interest in medicinal <italic>C. sativa</italic>. Literature on the impact of root-associated chemicals on plant parasitic nematodes was also searched; in cases where there were no reports, impacts on free-living or animal parasitic nematodes were discussed.</p>
</abstract>

The many decades during which the cultivation of Cannabis sativa (hemp) was strongly restricted by law resulted in little research on potential pathogenic nematodes of this increasingly important crop. The primary literature was searched for hemp-nematode papers, resulting in citations from 1890 through 2021. Reports were grouped into two categories: (i) nematodes as phytoparasites of hemp, and (ii) hemp and hemp products and extracts for managing nematode pests. Those genera with the most citations as phytoparasites were Meloidogyne (root-knot nematodes, 20 papers), Pratylenchus (lesion nematodes, 7) and Ditylenchus (stem nematodes, 7). Several Meloidogyne spp. were shown to reproduce on hemp and some field damage has been reported. Experiments with Heterodera humuli (hop cyst nematode) were contradictory. Twenty-three papers have been published on the effects of hemp and hemp products on plant-parasitic, animal-parasitic and microbivorous species. The effects of hemp tissue soil incorporation were studied in five papers; laboratory or glasshouse experiments with aqueous or ethanol extracts of hemp leaves accounted for most of the remainder. Many of these treatments had promising results but no evidence was found of large-scale implementation. The primary literature was also searched for chemistry of C. sativa roots. The most abundant chemicals were classified as phytosterols and triterpenoids. Cannabinoid concentration was frequently reported due to the interest in medicinal C. sativa. Literature on the impact of root-associated chemicals on plant parasitic nematodes was also searched; in cases where there were no reports, impacts on free-living or animal parasitic nematodes were discussed.

Review of nematode interactions with hemp (<italic>Cannabis sativa</italic>)

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Review of nematode interactions with hemp ()

The many decades during which the cultivation of Cannabis sativa (hemp) was strongly restricted by law resulted in little research on potential pathogenic...

Review of nematode interactions with hemp (Cannabis sativa)

Published Online: Feb 18, 2022

Page range: 1 - 18

Received: Aug 23, 2021

DOI: https://doi.org/10.21307/jofnem-2022-002

Keywords
Cyst nematodes, Hemp, Host-parasite relationships, Management, Plant extracts, Review, Root chemistry, Root-knot nematodes, Stem nematodes

© 2022 Ernest C. Bernard et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Review of nematode interactions with hemp (Cannabis sativa)

Published Online: Feb 18, 2022

Page range: 1 - 18

Received: Aug 23, 2021

DOI: https://doi.org/10.21307/jofnem-2022-002

KeywordsCyst nematodes, Hemp, Host-parasite relationships, Management, Plant extracts, Review, Root chemistry, Root-knot nematodes, Stem nematodes

© 2022 Ernest C. Bernard et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Cyst nematodes, Hemp, Host-parasite relationships, Management, Plant extracts, Review, Root chemistry, Root-knot nematodes, Stem nematodes