Résumés
Abstract
Cannabis (Cannabis sativa L.; Rosales: Cannabaceae) is a newly legalized crop and requires deeper insights on its pest communities. In this preliminary study, we identified a thrips species affecting indoor-grown cannabis in Canada and tested its impact on plant yield. We used three levels of initial infestation (zero, one, and five thrips) on individual plants grown in two growing mediums: conventional substrate or substrate containing the biostimulant Bacillus pumilus Meyer and Gottheil (Bacillales: Bacillaceae). We found that the onion thrips, Thrips tabaci (Lindeman) (Thysanoptera: Thripidae), is proliferating in indoor-grown cannabis. Furthermore, our results showed that fresh yields were higher for the plants that initially received zero thrips compared to those that initially received five thrips. Moreover, the biostimulant only marginally helped reduce the impact of thrips. We highlight the importance for growers to carefully monitor thrips infestations in indoor-grown cannabis. Finally, we emphasize the need for more research related to the impact of pests on cannabis yields and safe means of pest control for this strictly regulated crop.
Keywords:
- integrated pest management,
- biopesticides,
- marijuana,
- hemp,
- THC,
- cannabinoids
Résumé
Le cannabis (Cannabis sativa L.; Rosales : Cannabaceae) est une culture nouvellement légalisée et qui requiert des connaissances approfondies sur ses ravageurs. Dans cette étude préliminaire, nous avons identifié une espèce de thrips affectant le cannabis cultivé à l’intérieur au Canada et testé son impact sur le rendement des plants. Nous avons testé trois niveaux initiaux d’infestation (zéro, un et cinq thrips) sur des plants individuels cultivés dans deux terreaux : un substrat conventionnel ou un substrat contenant le biostimulant Bacillus pumilus Meyer and Gottheil (Bacillales : Bacillaceae). Nous avons observé que le thrips de l’oignon, Thrips tabaci (Lindeman) (Thysanoptera : Thripidae) prolifère dans le cannabis cultivé à l’intérieur. Nos résultats montrent que le rendement des plants de cannabis est plus élevé pour les plants n’ayant pas reçu de thrips comparativement aux plants sur lesquels cinq thrips ont initialement été inoculés. De plus, le biostimulant n’a pas permis de réduire l’impact des thrips. Nous mettons en lumière l’importance pour les producteurs de cannabis cultivé à l’intérieur de faire un suivi rigoureux de leurs populations de thrips. Finalement, nous soulignons les besoins importants en recherche concernant les ravageurs du cannabis, leurs impacts et le développement de méthodes de lutte dans cette culture hautement réglementée.
Mots-clés :
- lutte intégrée,
- biopesticides,
- marijuana,
- chanvre,
- THC,
- cannabinoïdes
Parties annexes
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