the Fate of Field Paspalum Control - The Paginator

GREEN LIGHT ON GOLF • continued
This mowing stress resulted in a
rapid decline in the quality of plots
treated with Signature alone, Torque
alone, Signature + Torque, Super
Stimulant alone, Nano Argentum and
the untreated control. Urea alone had
provided good quality (> 8.0) between
July 12 and July 26. Fair quality (>
7.0) was provided by Fore Rainshield
alone and by Signature + Fore Rainshield
in that same time period.
On July 26 (i.e., 4 days after 0.150"
mowing was resumed), plots treated
with Super Stimulant + urea improved
to a rating of 8.1. Only Fore Rainshield
alone or tank-mixed with Signature
had improved quality on all
rating dates. The benefits of urea were
not evident until following the second
application. Chipco Signature alone
improved quality compared to the control
on July 12 and July 20, but the
quality of these plots was acceptable
(>8.0) on only one date (July 12).
Torque alone, Superstimulant alone
and Nano Argentum did not improve
quality compared to the untreated
control on any rating date. Plots
treated with these products exhibited
unacceptable quality on July 20
and July 26.
Our results — diseases
Disease data appear in Table 2. Due to
variability in the distribution of R.
zeae, R. solani and yellow spot across
the study area, there were no significant
treatment effects. There was a
trend for reduced Rhizoctonia disease
with Torque, Signature + Torque, and
Fore Rainshield. Yellow spot was
enhanced by SuperStimulant applied
alone, when compared to the control.
Conclusion
This study supports previous investigations
demonstrating that urea and
Fore Rainshield are powerful tools
in improving the summer quality of
creeping bentgrass greens. •
Table 2. Rhizoctonia spp. and yellow spot diseases in a ‘Declaration’ creeping bentgrass green with summer decline, 2010.
Rate
Number of R. zeae rings/plot
% R. solani
# of Yellow
spots/plot
Fungicide +
(Product/1,000 ft 2 )
June 23
June 29
June 29
July 12
Chipco Signature 80WG
4.0 oz.
2.8 a ‡
6.0 a
3.8 a
3.3 b
Fore Rainshield 80WP
6.0 oz.
0.0 a
2.3 a
0.8 b
2.5 b
Torque 3.6SC
0.6 oz.
0.0 a
1.0 a
0.3 b
4.8 ab
Urea 46-0-0
0.15 lb. N
3.3 a
4.8 a
9.8 a
4.8 ab
Super Stimulant
6.0 fl. oz.
1.5 a
6.0 a
5.5 ab
8.5 a
Signature + Fore
4.0 + 6.0 oz.
0.5 a
4.0 a
3.8 ab
3.8 b
Signature + Torque
4.0 + 3.2 oz.
0.0 a
0.5 a
0.0 b
6.0 ab
Super Stimulant + Urea
6.0 oz. + 0.15 lb. N
1.8 a
3.5 a
6.5 ab
3.5 b
Nano Argentum
0.032 oz. (41 ml/A)
3.5 a
4.5 a
10.8 a
5.3 ab
Untreated
—
2.8 a
7.0 a
4.8 ab
2.3 b
++ Treatments were applied June 15, June 29 and July 13, 2010.
‡ Means in a column followed by the same letter are not significantly different according to Fisher’s LSD, 5%.
28 MTC TURF NEWS