Research Summary Abstract
From 1999 to 2016, numerous products representing 36 active ingredients were evaluated in several greenhouse experiments as soil drench, soil incorporation, foliar or soak application, and in one field trial as soil drench, against Rhizoctonia solani. Trials were conducted on chrysanthemum, garden impatiens, petunia, poinsettia, snapdragon, viburnum and zinnia. The relatively new registered products Affirm/Endorse/Veranda O (polyoxin D), Heritage (azoxystrobin), Medallion (fludioxonil) and Pageant Intrinsic (pyraclostrobin + boscalid) showed excellent efficacy. Although there were insufficient data for definitive conclusions, BAS 703/Orkestra, Compass, Disarm, Empress Intrinsic, Hurricane, Promax, Tourney and Trinity generally provided excellent efficacy. The biological products Actinovate, Howler, MBI-110, RootShield PLUS and SoilGard also provided good to excellent efficacy in limited number of tests. Of the established standards, Terraclor provided excellent efficacy, while 3336 generally provided inconsistent efficacy.