Grape Hyacinth Control in No-Till Fields

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

Grape hyacinth has been showing up in no-till fields in Sussex County. The biggest problem is in soybeans in the fall because it interferes with harvest. It emerges in the fall and can get up to 8 to 10 inches tall and if the infestation is severe, the waxy succulent leaves will interfere with the cutter bar. We do not have a lot of experience with it at this point, but it appears that glyphosate at 1.5 times the normal rate is the best treatment. Last spring we compared glyphosate at normal and 1.5 X rates with paraquat, both tank mixed with Canopy or 2,4-D; all treatments were applied in the spring as the burndown treatment prior to planting soybeans. The treatment that provided the best grape hyacinth control in the fall was the higher rate of glyphosate, and additional herbicides did not improve control. Glyphosate in the spring was slow to kill the grape hyacinth; but in the fall, the number of stems was significantly lower and the plants were smaller. We have an ongoing project looking at the most effective method to control this emerging weed problem.

grape hyacinth

Grape hyacinth (Muscari armeniacum)

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