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Spotgun-Applied Hexazinone: Release of Red Pine (Pinus resinosa) from Quaking Aspen (Populus tremuloides) Competition and Residue Persistence in Soil

Published online by Cambridge University Press:  12 June 2017

Raj Prasad  and
Joseph C. Feng
Raj Prasad
Affiliation:
For. Pest Manage. Inst., For. Can., P.O. Box 490, Sanlt Ste. Marie, Ont., Canada P6A 5M7
Joseph C. Feng
Affiliation:
For. Pest Manage. Inst., For. Can., P.O. Box 490, Sanlt Ste. Marie, Ont., Canada P6A 5M7
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Abstract

Weed control and red pine release by spotgun-applied hexazinone in a northern Ontario plantation were evaluated 3 yr after treatment, while hexazinone residues and lateral movement in the sandy loam soil were determined 1 yr after treatment. Hexazinone, grid pattern spot applied at 480 mg ai/spot, approximating 1.6 kg ai/ha, resulted in 88% quaking aspen stem dieback and variable suppression of white birch and pin cherry. The height and basal diam of treated red pine were 131 and 150% of control, respectively, after 3 yr. Hexazinone residues were reduced to 1% at the treated spot and did not move laterally beyond 0.5 m, 1 yr after treatment. Detection of small amounts of metabolites A and B (0.2 and 0.3%) indicated the non-cumulative degradation of hexazinone in soils.

Keywords

Hexazinone, 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H3H)-dionemetabolite A, 3-(4-hydroxycyclohexyl)-6-(dimethylamino)-1-methyl-l,3,5-triazine-2,4(1H,3H)-dionemetabolite B, 3-cyclohexyl-6-(methylamino)-1-methyl-1,3,5-triazine-2,4(H,3H)-dionered pine, Pinus resinosa Ait.quaking aspen, Populus tremuloides Michx. ♯3 POPTMwhite birch, Betula papyrifera Marsh. ♯ BETPYpin cherry, Prunus pensylvanica L.f. ♯ PRNPEConifer releaseleachingweed competitionPOPTM
Type
Research
Information
Weed Technology , Volume 4 , Issue 2 , June 1990 , pp. 371 - 375
Copyright
Copyright © 1990 Weed Science Society of America 

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