Reduced hack and squirt treatment with aminocyclopyrachlor and aminopyralid for invasive shrub control

Abstract Invasive shrubs often present extremely difficult challenges for individual plant treatment approaches due to multiple basal stems with complex branching patterns. Basal bark and cut stump treatments have been the standard methods managing large-statured shrubs, while hack squirt has disregarded as operationally too difficult. However, is a more discriminant technique that may lead reduction in herbicide use. Here, we evaluated speed, use, performance of reduced approach using single hacks per stem injected 0.5 ml either aminocyclopyrachlor (240 g L −1 ) or aminopyralid against conventional low-volume triclopyr ester (96 amine (180 ). The experiments were conducted on three subtropical shrub species: Eugenia uniflora , Lagerstroemia indica Schinus terebinthifolia . Across species, found resulted comparable efficacy treatment, was faster than used less carrier treatment. A significant shift which typically employs narrow continuous spacing around entire circumference each stem. Future work should seek clarify applicability this over wide range invasive shrubs.