Spatial and temporal distribution of trunk-injected (14) C-imidacloprid in Fraxinus trees.

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Tanis SR, Cregg BM, Mota-Sanchez D, McCullough DG, Poland TM

Spatial and temporal distribution of trunk-injected (14) C-imidacloprid in Fraxinus trees.

Pest Manag Sci. 2012 Apr;68(4):529-36. doi: 10.1002/ps.2281. Epub 2012 Jan 30.

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22290795 [ View in PubMed
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Abstract

BACKGROUND: Since the discovery of Agrilus planipennis Fairmaire (emerald ash borer) in 2002, researchers have tested several methods of chemical control. Soil drench or trunk injection products containing imidacloprid are commonly used to control adults. However, efficacy can be highly variable and may be due to uneven translocation of systemic insecticides. The purpose of this study was to determine whether sectored xylem anatomy might influence imidacloprid distribution in tree crowns. RESULTS: Imidacloprid equivalent concentrations were higher in leaves from branches in the plane of the injection point (0 degrees ) than in leaves from branches on the opposite side of the injection point (180 degrees ). Leaves from branches 90 degrees to the right of injection points had higher imidacloprid equivalent concentrations than leaves from branches 90 degrees to the left of injection points. Leaves and shoots had higher imidacloprid equivalent concentrations than roots and trunk cores, indicating that imidacloprid moves primarily through the xylem. CONCLUSION: Imidacloprid equivalent concentration in leaves varied over time and in relation to injection points. It is concluded that ash trees have sectored 'zigzag' xylem architecture patterns consistent with sectored flow distribution. This could lead to variable distribution of imidacloprid in tree crowns and therefore to variable control of A. planipennis.

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