Comparison of safened and unsafened formulations of Revolver on kikuyugrass fairways

June 1, 2005

All treatments caused significant phytotoxicity to kikuyugrass, with damage progressively worsening over a three week period (8/14 - 9/5/02). By 4 weeks after treatment, the decline in turf quality had leveled off, and in some cases (treatments 8 and 9, single applications of the lowest rates tested) some recovery was observed.
On 8/21 and 9/5 (1 and 3 weeks after the first treatment), the only differences observed were between the non-treated check and the treated plots. There were no significant differences among the Revolver treatments, however.
On 9/12 (4 WAT), some differences among treatments began to emerge (P<0.5), including:
A single application of either the A8 or A1 formulation resulted in less phytotoxicity than two applications of these formulations, when applied at the 0.4 oz/1000 sq ft rate. This effect seems to be primarily due to more rapid recovery of the kikuyugrass in the plots treated with a single application of material.
A single application of the A8 formulation showed significantly less phytotoxicity at the 0.4 oz/1000 rate than either the 0.6 or 1.2 rates. However, there was no significant different between the 0.6 and 1.2 oz rates.
There were no significant differences among the three rates tested for the A2 formulation - 0.4, 0.6 or 1.2 oz/1000 sq ft.
There was a slight trend indicating that the A1 formulation may be more toxic than the A8 formulation. However, this was not statistically significant at the 0.05 level.