Spotgun-applied hexazinone: release of red pine (Pinus resinosa) from quaking aspen (Populus tremuloides) competition and residue persistence in soil

Authors

R. Prasad
J.C. Feng

Document Type

Article

Journal/Book Title/Conference

Weed Technology

Volume

4

Issue

2

First Page

371

Last Page

375

Publication Date

1990

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.

Recommended Citation

Prasad, R. and Feng, J. C. 1990. Spotgun-applied hexazinone: release of red pine (Pinus resinosa) from quaking aspen (Populus tremuloides) competition and residue persistence in soil. Weed Technology. 4 (2): 371-375.