Control is effective even at the early flowering stage. Because glyphosphate is nonselective, treatment should occur after desirable species have completely gone to seed for the season. Because ester formulations are very volatile, amine forms are recommended to reduce the chance of off-target movement. Manual Control Manual control of yellow starthistle is very effective in dealing with small, localized infestations. Small populations can be controlled and greatly reduced by hand pulling, hoeing, or cutting with scythes or weedeaters.
Manual methods are also useful for spot-weeding plants that survive from other control methods.
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