the Fate of Field Paspalum Control - The Paginator

TURF TALK • continued
fescue quality on July 6, but the high
rate of Velocity (0.066 lb. ai/A)
reduced quality from June 23 until
data collection ended on September
Photo 5. Field paspalum spreads readily by seed.
9 (Table 2). The single application of
Fusilade II reduced tall fescue quality
from June 10 to July 12. Certainty was
applied twice and almost completely
eliminated the tall fescue, while Dismiss
(applied three times) did not
injure the tall fescue. Certainty is
labeled for the purpose of selectively
controlling tall fescue in Kentucky
bluegrass. Thus, death of most of
the tall fescue plants in Certaintytreated
plots came as no surprise.
In the preemergence 2010 study, the
site was first treated with Round-up
(glyphosate) on April 5, and then
separate blocks were disk-seeded with
tall fescue, perennial ryegrass and
hard fescue on April 6. Tenacity was
applied once at 0.50 lb. ai/A on April
12 or twice at 0.125, 0.156, 0.187
and 0.25 lb. ai/A on April 12 and May
12 (mixed with 0.25% v/v NIS on
May 12 only). Tupersan was applied
once at 12 lb. ai/A or twice at 6.0 lb.
ai/A on April 12 and May 12.
Data were collected on September 9,
and all treatments generally provided
a statistically equivalent level of
field paspalum control (Table 3).
For Tenacity-treated tall fescue and
Table 3. Field paspalum cover in three spring-seeded turfgrass species in College Park, MD, 2010.
Rate % field paspalum cover on Sept. 9, 2010
Herbicide* (lb. ai/A) TF PRG HF
Tenacity 4SC 0.50 11 b** 16 b 50 b
Tenacity 4SC 0.125 + 0.125 11 b 18 b 48 b
Tenacity 4SC 0.156 + 0.156 6 b 17 b 45 bc
Tenacity 4SC 0.187 + 0.187 8 b 16 b 26 bcd
Tenacity 4SC 0.25 + 0.25 2 b 10 b 22 cd
Tupersan 50WP 12.0