ISHS Acta Horticulturae 109: III International Symposium on Flower Bulbs
CONTROL OF DRECHSLERA IRIDIS ON BULBOUS IRIS BY SOIL APPLICATIONS OF TRIADIMEFON |
| Authors: | Gary A. Chastagner, Worth E. Vassey |
| Abstract:
Greenhouse and field trials demonstrated soil applications of the systemic fungicide triadimefon controlled ink spot, caused by Drechslera iridis (Oud.) Ellis, on 'Ideal' Iris. Granules (5%) of triadimefon were mixed into potting soil, applied in furrow at the time of planting, or applied over rows prior to a second hillup 3 weeks after planting. Mixing potting soil with the equivalent of 0.47 kg triadimefon per ha gave excellent control of ink spot. Potting soil containing triadimefon at or above 9.4 kg/ha resulted in reduced plant height. Blasted flowers increased significantly when plants were forced in potting soil containing triadimefon at or above 18.63 kg/ha. Excellent control of ink spot on field grown Iris was obtained from in furrow applications of triadmefon at planting. Applications of triadimefon to the top of rows 3 weeks after planting were ineffective. Ink spot can be effectively controlled through a single growing season with an in furrow application of triadimefon at the time of planting. | |
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