The Use of Reduced Rates of Herbicide Combinations in Tank-mixes for Goosegrass (Eleusine indica (L.) Gaertn.) Control

A study was conducted to determine the efficacy of a combination of ametryn plus glyphosate or glufosinate in tank-mixtures on the control of goosegrass at the 3to 4tiller growth stage under glasshouse and field conditions. In the glasshouse, seven of the nine herbicide combinations were additive, while two of them were antagonistic when goosegrass was treated with combinations of ametryn plus glyphosate, suggesting that ametryn is compatible with glyphosate. For combinations of ametryn plus glufosinate, additive responses were observed in five combinations, while the other four herbicide combinations gave antagonistic responses. In the field, it was found that a combination of ametryn at 80 g a.i. ha with either glyphosate at 1 320 g a.i. ha or glufosinate at 50 g a.i. ha provided good control of goosegrass ranging from 80 to 100%. 1 1