Safety of triclopyr triethylamine to native wetland species

Abstract

Current management options for wetland weed control are limited The triethylamine (TEA) salt formulation of the herbicide triclopyr effectively controls several broadleaf aquatic and wetland weed species and is relatively selective to many wetland species To evaluate the tolerance of vegetation associated with weed species a range of indigenous wetland species including the widespread Dacrycarpus dacrydioides Apodasmia similis Carex virgata Eleocharis acuta Isachne globosa Juncus pallidus Triglochin striata Phormium tenax and Mazus radicans and the nationally endangered Carex cirrhosa Amphibromus fluitans Crassula helmsii and Selliera rotundifolia were sourced from wildcollected or cultivated material and then grown on Triclopyr TEA was applied to wetting at rates between 025 and 5 Dacrycarpus dacrydioides I globosa and A fluitans appeared to have recovered fully from early damage from the 05 rate by the conclusion of the trial Apodasmia similis C virgata C cirrhosa E acuta and J pallidus were damaged but not completely killed at this rate whereas the remaining five species were killed at all herbicide rates applied