Chemical control of coppicing shoots of Brachystegia boehmii Taub., Brachystegia spiciformis Benth. and Julbernardia globiflora (Benth.) Troupin. 1. Foliar application of Tordon 101 and other chemicals to Brachystegia species
Killilea, D.M.; Heelas, B.V.; McNeill, L.
Zimbabwe Journal of Agricultural Research 19(2): 171-183
(1) The concn. of Tordon 101 (picloram + 2,4-D), applied by knapsack-sprayer to the point of run-off, that was required for 80% kill of coppice stools on a rangeland site in Zimbabwe was 11-153 g total a.e. per litre, according to species and season. Spraying in March or April was generally more effective than at other seasons. Addition of ammonium sulphate to the sprays did not increase response. ULV application gave poor control. The other chemicals tested (glyphosate, paraquat and S,S,S-tributyl phosphorotrithioate) caused defoliation but killed few plants. (2) The corresponding effective a.e. concn. for Tordon 155 (picloram + 2,4,5-T) in diesel oil was 13-116 g/litre.