BioOne.org will be down briefly for maintenance on 17 December 2024 between 18:00-22:00 Pacific Time US. We apologize for any inconvenience.
How to translate text using browser tools
29 March 2022 Effectiveness of Emamectin Benzoate and Propiconazole for Protecting Picea engelmannii (Pinales: Pinaceae) from Mortality Attributed to Dendroctonus rufipennis (Coleoptera: Curculionidae) in Wyoming
Christopher J. Fettig, A. Steven Munson, Darren C. Blackford, Donald M. Grosman, Jackson P. Audley
Author Affiliations +
Abstract

Spruce beetle, Dendroctonus rufipennis Kirby (Coleoptera: Curculionidae), causes significant mortality of mature spruce, Picea spp. (Pinales: Pinaceae), in western North America. We evaluated the effectiveness of two formulations of bole injections of emamectin benzoate (TREE-äge® G4 and TREE-äge R10; Arborjet, Inc., Woburn, MA) alone and combined with propiconazole (Propizol®; Arborjet, Inc.) for protecting Engelmann spruce, Picea engelmannii Parry ex Engelm., from mortality attributed to colonization by D. rufipennis. Treatments were injected 16–19 July 2017, and levels of Pi. engelmannii mortality were determined for 2018 and 2019. Each experimental tree (n = 30, including an untreated control group) was baited with aggregation pheromone (frontalin) June–September 2018. All surviving treated Pi. engelmannii and a second untreated control group were baited June–September 2019. Both TREE-äge G4 and TREE-äge R10 significantly reduced levels of Pi. engelmannii mortality compared with the untreated control; however, protection was limited to one field season. Protection was increased to two field seasons by combining TREE-äge G4 and TREE-äge R10 with Propizol. The addition of Propizol, a triazole fungicide, likely reduced the progression of blue stain within treated Pi. engelmannii increasing tree health and resistance to D. rufipennis.

Christopher J. Fettig, A. Steven Munson, Darren C. Blackford, Donald M. Grosman, and Jackson P. Audley "Effectiveness of Emamectin Benzoate and Propiconazole for Protecting Picea engelmannii (Pinales: Pinaceae) from Mortality Attributed to Dendroctonus rufipennis (Coleoptera: Curculionidae) in Wyoming," Journal of Entomological Science 57(2), 240-247, (29 March 2022). https://doi.org/10.18474/JES21-45
Received: 31 July 2021; Accepted: 3 September 2021; Published: 29 March 2022
KEYWORDS
Engelmann spruce
fungicides
insecticides
spruce beetle
tree protection
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top