Abstract: In 2002 upon the recommendation of Syngenta Crop Protection a number of Kentucky soybean producers began making tank mix applications of Quadris® + Warrior® to enhance soybean yields. In 2003 it is estimated that at approximately 30,000 acres were treated with this combination. Syngenta developed a “Guarantee” program to interest producers in testing this combination. Data were gathered by Syngenta, indicating yield enhancement had occurred, but the tests were un-replicated, and no data was provided to illustrate why yield increase may have occurred. In 2003 two replicated small plot studies, three replicated large “strip plot studies”, and combining of numerous non-replicated, but paired strip trials were used to evaluate possible yield enhancement and to illustrate what if any pest activity may have contributed to any differences. These studies provide sufficient data of some effect to warrant a closer look, specifically at possible causative agents. In 2004 three replicated small plot studies were implemented to elucidate the affects of planting date, maturity group and application timing on pest loads and resulting soybean yields.