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, Kevin Chase Bartlett Tree Research Laboratories , Charlotte, NC 28278 , USA Corresponding author, e-mail: kchase@bartlett.com Search for other works by this author on: Oxford Academic Caitlin Littlejohn Bartlett Tree Research Laboratories , Charlotte, NC 28278 , USA Search for other works by this author on: Oxford Academic Amber Stiller Bartlett Tree Research Laboratories , Charlotte, NC 28278 , USA Search for other works by this author on: Oxford Academic Chris Riley Bartlett Tree Research Laboratories , Charlotte, NC 28278 , USA Search for other works by this author on: Oxford Academic
https://orcid.org/0000-0002-7402-967X Arthropod Management Tests, Volume 47, Issue 1, 2022, tsac070, https://doi.org/10.1093/amt/tsac070
Published:
02 May 2022
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Kevin Chase, Caitlin Littlejohn, Amber Stiller, Chris Riley, Systemic Insecticide Efficacy of Mainspring Against Boxwood Leafminer, 2021, Arthropod Management Tests, Volume 47, Issue 1, 2022, tsac070, https://doi.org/10.1093/amt/tsac070
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Boxwood | Buxus spp
Boxwood leafminer | Monarthropalpus flavus (Schrank)
The objective of this study was to evaluate the efficacy of different rates of Mainspring (active ingredient: cyantraniliprole) applied as a soil drench for management of boxwood leafminer on Buxus spp. Mainspring is currently labeled for foliar applications against boxwood leafminer but it is unknown if systemic drenches are effective against this pest in established landscape plantings. Presently, imidacloprid is the most effectively used systemic insecticide against this pest. We tested three rates of Mainspring (Table 1) at the Bartlett Tree Research Laboratory and Arboretum in Charlotte, NC throughout 2021. The plot consisted of Buxus microphylla, B. microphylla var. japonica ‘Green Beauty’, Buxus ‘Green Mountain’. All boxwoods were ~8 feet tall and heavily infested with boxwood leafminer. There were two replicates per treatment. Mainspring was applied as a soil drench using a 5-gallon bucket. Systemic drenches were applied on 4 Mar 2021.
Table 1.
Open in new tab
| Treatment/form | Mix rate (ounces/foot of shrub height)a |
|---|---|
| Mainspring | 0.0625 oz |
| Mainspring | 0.125 oz |
| Mainspring | 0.25 oz |
| Check | — |
| Treatment/form | Mix rate (ounces/foot of shrub height)a |
|---|---|
| Mainspring | 0.0625 oz |
| Mainspring | 0.125 oz |
| Mainspring | 0.25 oz |
| Check | — |
aOne quart of mixed solution (Mainspring and water) was applied per foot of shrub height.
Table 1.
Open in new tab
| Treatment/form | Mix rate (ounces/foot of shrub height)a |
|---|---|
| Mainspring | 0.0625 oz |
| Mainspring | 0.125 oz |
| Mainspring | 0.25 oz |
| Check | — |
| Treatment/form | Mix rate (ounces/foot of shrub height)a |
|---|---|
| Mainspring | 0.0625 oz |
| Mainspring | 0.125 oz |
| Mainspring | 0.25 oz |
| Check | — |
aOne quart of mixed solution (Mainspring and water) was applied per foot of shrub height.
Samples were collected once every other week in May and Jun, once in Oct and once in Dec. We collected branch samples in each of the four cardinal directions from each plant at the following heights: 0–2, 2–4, 4–6, and 6–8 feet. Ten leaves from each branch sample were dissected under a microscope to look for living or dead boxwood leafminers. All leaves that contained at least one living boxwood leafminer was deemed ‘alive’ and leaves with no living insects were deemed ‘dead’, creating a binomial distribution. Notes were taken for all leaves containing some dead boxwood leafminers. No rate of Mainspring was found to cause mortality of boxwood leafminer when treated as a soil drench within the sampling period. Due to the slow movement of anthranilic diamide insecticides, we will not be treating these same plants in 2022 to observe if boxwood leafminer mortality is observed.1
1 This research was supported by industry gifts of pesticides.
© The Author(s) 2022. Published by Oxford University Press on behalf of Entomological Society of America.
This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
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Section Editor: Carlos Bogran Carlos Bogran Section Editor Search for other works by this author on: Oxford Academic
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