Absence of acute adverse effects on Bombus impatiens colonies after 2 weeks' exposure to turf with flowering white clover that had bloomed after the sward was mown to remove flowers present at the time of treatment.

Insecticide application, mowing, and introduction of bee colonies were on June 1, 15, and 22, respectively.ANOVA (df = 2, 19): live, F = 6.01, P = 0.02; dead, F = 1.05, P = 0.37; Wt live workers, F = 3.31, P = 0.08; live immature, F = 1.60, P = 0.25; dead immature, F = 0.54, P = 0.6, honey pots, F = 2.15, P = 0.17, hive wt, F = 1.93, P = 0.20.*Significantly higher than untreated; 2-tailed Dunnett's test.aAll adults (other than original queen) were workers as there would not have been time for males to emerge from the brood (K. Skyrm, Koppert Biological Systems, personal communication).blarvae, pupae, and fully-formed workers still enclosed in the pupal exoskeleton within the cell.cadult workers and original queen.