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Forestry 1994 67(3):237-244; doi:10.1093/forestry/67.3.237
© 1994 by Institute of Chartered Foresters
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Tolerance of some Broadleaved and Coniferous Forestry Tree Species to Herbicides with Potential for Bracken Control

J. LAWRIE and D.V. CLAY*

Department of Agricultural Sciences, University of Bristol, Institute of Arable Crops Research, Long Ashton Research Station Bristol BS18 9AF, England

* Present address: Avon Vegetation Research, PO Box 1033, Nailsea, Bristol, BS19 2FH, England

The tolerance of two broadleaved and two coniferous forestry tree species to overall sprays of three sulfonylurea herbicides, with the potential for bracken control were tested in comparison with asulam on outdoor pot experiments, applied at three different dates. Thifensulfuron-methyl and tribenuron-methyl caused little damage, however, date of application of these herbicides can affect the tolerance of some of the tree species. Asulam, used outside the recommended time for bracken control, and metsulfuron-methyl caused damage to cherry, oak, Douglas fir and Japanese larch.

The tolerance of Sitka spruce to thifensulfuron-methyl and tribenuron-methyl, and a mixture of them applied at six different dates was also tested. Sitka spruce was not affected at any treatment date or by mixtures of the two sulfonylurea herbicides.

Received 8 February 1993.
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