Chemical control of thunbergia (Thunbergia grandiflora).

摘要

Thunbergia (Thunbergia grandiflora) is destroying north Queensland tropical lowland rain forests at a rate of about 0.5 ha/yr. Three experiments were conducted near Innisfail, Queensland, during 1987-91, to test 25 herbicides at various concentrations as high volume foliar applications for the control of thunbergia. Most herbicides produced 100% brown out, but failed to prevent regrowth of underground tubers and allowed complete recovery of treated plants in 3-6 months. Only imazapyr (1.87, 2.5 and3.75 g L-1) killed both the above-ground growth and the tuberous root system. The three next most effective herbicides, triclopyr/picloram, fluroxypyr and 2,4-D/picloram produced 80-100% foliage reduction and 20-75% regrowth of underground tubers.