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Showing results for tags 'knotweed'.
Hi all, Has anyone done DNA tests on knotweed to determine whether it is Japanese, Bohemian or Giant? I'm working with an Oakland University professor on this and just curious if anyone has tried it before in Michigan. Let me know if so! Also curious once we determine which varieties are present in our area whether the treatment effectiveness may vary depending on the variety. Any insights appreciated, thanks!
Here's a quick overview of the treatments ISN has found most successful for controlling knotweeds: Milestone (aminopyralid) Faster kill (~3 years), more off-target effects Standard rate (3-7 oz/acre; 0.01%) Using nonionic surfactant (standard rate) Late spring (3-4 ft high) or late summer (at least 60 days before frost) When treating in late summer, it is helpful to do a cut of the plants a month or so in advance ONLY IF safe disposal of the stems is possible At some sites, repeat treatments (spring & summer) may b