Weed control among planted and direct-seeded Eucalyptus, Acacia and Casuarina with the herbicides diphenamid, oryzalin, clopyralid and fluazinfop-butyl

Hall, M.; Burns, M.

Weed control among planted and direct-seeded Eucalyptus, Acacia and Casuarina with the herbicides diphenamid, oryzalin, clopyralid and fluazinfop-butyl

1991

Hall, M. (New South Wales Forestry Commission, Lithgow (Australia)) | Burns, M. (Envirosciences, Newcastle West (Australia))

In a glasshouse pot trial, applications of oryzalin at 4 and 8 kg a.i. per ha were toxic to germinating seeds of E. maculata, C. glauca and A. saligna. Diphenamid was toxic at rates of 7 and 14 kg a.i. per ha to germinating C. glauca and A. saligna, but not to E. maculata. Both the pre-emergence herbicides oryzalin and diphenamid were selective at these rates when applied in a field trial over newly-planted seedlings of E. melliodora, C. cunninghamiana and A. baileyana. Overall, the most satisfactory long-term weed control and tree response was achieved with oryzalin. The post-emergence herbicides fluazifop-butyl at 0.6 and 1.2 kg a.i. per ha and clopyralid at 0.25 and 0.5 kg a.i. per ha, were mostly selective to seedlings but gave unsatisfactory weed control.

اظهر المزيد [+]