Effects of fluazifop‐butyl on shoot growth and rhizome buds of Elymus repens (L.) Gould

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Abstract
Summary: A series of glasshouse experiments was conducted to evaluate the activity of fluazifop‐butyl, butyl 2‐[4‐(5‐trifluoromethyl‐2‐pyridyloxy)phenoxy] propionate, against Elymus repens. Foliar applications of doses 0·25–1·0 kg ha−1 consistently gave better control than did soil applications. The most obvious phytotoxic symptoms were chlorosis and necrosis, beginning with the youngest leaves 5–6 days after spraying, which spread to all leaves within 2 weeks. Translocation was measured by defoliating plants at different times after spraying and assessing regrowth and by evaluating rhizome‐bud viability. At low doses (0·125 and 0·25 kg ha−1) translocation to rhizomes occurred mainly between 6 and 48 h. When fluazifop‐butyl was sprayed at a dose range of 0·125–1·0 kg ha−1, at least 90% of the rhizome buds had accumulated a lethal dose within 72 h of spraying. In another experiment, with a dose of 0·25 kg ha−1, 31, 72 and 92% of rhizome buds were found to be non‐viable when sampled 2, 24 and 48 h respectively after spraying. At 1·0 kg ha−1 all the buds had accumulated sufficient herbicide to prevent sprouting 48 h after spraying.

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