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Forestry 1994 67(4):287-295; doi:10.1093/forestry/67.4.287
© 1994 by Institute of Chartered Foresters
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Tolerance of 2-year-old Forestry Trees to Five Herbicides

J. LAWRIE and D. V. CLAY*

AFRC Institute of Arable Crops Research Long Ashton Research Station, Bristol BS18 9AF, U.K.

* Present address: Avon Vegetation Research, P.O. Box 1033, Nailsea, Bristol BS 19 2FH.

There is a need for selective foliar-acting herbicides for transplant lines in forestry nurseries and new forestry plantings. Tolerance of 2-year-old pot-grown trees of beech, birch, sycamore, ash, cherry, oak, red alder, Japanese larch and Sitka spruce to contact herbicides applied at different dates in the growing season was investigated.Clopyralid was safe to use on all species apart from some fresh weight reduction in Japanese larch. Bentazone and phenmedipham caused initial necrosis on most species tested; however, most trees outgrew the effect of phenmedipham in the following season. Bentazone, generally, had a long-term inhibitory effect on growth of alder and at the highest dose tested (5.2 kg ha–1 ) also affected ash and beech.Metsulfuron-methyl and tribenuron-methyl were safe on most species tested.However, fresh weight reductions were caused by metsulfuron-methyl in ash and cherry and by tribenuron-methyl in alder. Mecoprop damaged all species, apart from Sitka spruce.

Received 8 February 1993.
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