Effects of Fall Infection byGaeumannomyces graminisvar.triticiand Triadimenol Seed Treatment on Severity of Take-All in Winter Wheat

Publisher Website
Google Scholar
Abstract
Treatment of winter wheat seed with the systemic fungicide triadimenol at 14.8 and 29.6 ml a.i.[active ingredient]/45.4 kg of seed reduced take-all under artificially and naturally infested field conditions. Yield losses due to take-all were reduced 60-75% depending on rate of triadimenol applied. In greenhouse experiments, the treatments protected seedling roots from infection by G. graminis var. tritici (Ggt) for 4 and 8 wk, respectively. In the field, the lower rate of fungicide delayed infection by Ggt approximately 6 wk during the fall. Conversely, increases in the incidence of infection by Ggt during the winter and spring were virtually the same for plants derived from treated or nontreated seed. In 6 fields with known take-all levels, the high correlations for incidence of Ggt and percentage of whiteheads obtained when incidence was measured 4 or 8 wk after planting indicated that fall infections by Ggt strongly influenced the amount of take-all yield loss in conducive soils under Kansas [USA] conditions. Seed treatment with triadimenol protects wheat plants from Ggt during this critical period resulting in control.

This publication has 0 references indexed in Scilit: