Weed Control in Coffee in the New Guinea Highlands.

Abstract

Herbicides available in Papua New Guinea which are suited for use in coffee are briefly discussed. These include the foliar-acting herbicides paraquat, 2,4-D, MCPA, dalapon, amitrole and MSMA, and the soil-ac.ting herbicides diuron, atrazine and simazine. Programmes for weed control, based on paraquat and diuron, are outlined and methods of control are given for specific weeds which are troublesome or can become so under these programmes. These weeds include Paspalum conjugatum, Cynodon dactylon, Commelina diffusa, Crassocephalum crepidioides, Ipomoea batatas, Lindernia spp and Polygonum spp.