Control of Stripe Rust and Leaf Rust of Wheat with Seed Treatments and Effects of Treatments on the Host

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Abstract
In green house and field studies at Mount Vernon, Paterson, Pullman and Walla Walla, Washington [USA], triadimefon applied as a slurry to wheat (T. aestivum L.) seed at 0.5 g a.i.[active ingredient]/kg (0.6 oz a.i./bu) or higher controlled both stripe rust (Puccinia striiformis West.) and leaf rust (P. recondita Rob. ex. Desm.) from seedling emergence through the boot stage of plant growth. For winter wheat, control was effective Oct-May. Triadimefon at 0.25 g a.i./kg (0.3 oz a.i./bu) controlled the rusts through the tillering stage of plant growth. Fenarimol controlled both rusts as 2 g a.i./kg (2.4 oz a.i./bu) but was phytotoxic and did not control rust at lower rates. Butrizol was effective against leaf rust but not stripe rust. Benomyl at 0.5-2 g a.i./kg (0.6-2.4 a.i./bu) and oxycarboxin at 0.5-3.0 g a.i./kg (0.6-3.6 oz a.i./bu) provided only slight control. CGA-64251 reduced the rust but was phytotoxic at 0.12-1 g/kg k(0.15-1.2 oz/bu).

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