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Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass (DIGSS) Control in Turfgrass. Michael W. Melichar, Daniel L. Loughner, Zachary J. Reicher, Daniel V. Weisenberger, and Jeff A. Borger Dow AgroSciences LLC, Purdue University, and The Pennsylvania State University. - PowerPoint PPT Presentation
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Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for
Crabgrass (DIGSS) Control in Turfgrass
Michael W. Melichar, Daniel L. Loughner, Zachary J. Reicher, Daniel V.
Weisenberger, and Jeff A. Borger
Dow AgroSciences LLC, Purdue University, and The Pennsylvania State University
Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass (DIGSS)
Control in Turfgrass• Research Justification
– Dithiopyr and prodiamine are labeled for pre-emergent crabgrass control in turfgrass
• Typical applications occur in spring prior to crabgrass emergence
• Little research has been conducted with fall application of granular dithiopyr and prodiamine
– Fall applications would benefit professional lawn care operators and golf course superintendents allowing time in the spring to complete other required turfgrass management operations
Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass
(DIGSS) Control in Turfgrass• Key Question: How do fall and/or spring applications of
dithiopyr granule and prodiamine granule compare for crabgrass (DIGSS) control?
• Trial Locations– IN (Fall 2006 – July 2007 / Fall 2007 – August 2008)– PA (Fall 2007 – August 2008)
• Methods– Plots; 1.5M X 1.5M– Replications; 3– Application Equipment; Shaker Bottle or Shaker Table
• Statistical Analysis– Combined data from three trials– ANOVA with Tukey means comparison test to determine
differences between treatment means (p < .05)
Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass (DIGSS)
Control in Turfgrass• Key Findings
– Fall Applications• Dithiopyr
– A single fall application and a fall application followed by spring application provided acceptable crabgrass control at rates tested
– Fall application followed by spring application did not significantly improve crabgrass control over individual fall or spring applications at rates tested
• Prodiamine– Fall applications did not provide acceptable crabgrass control at
rates tested– Fall application followed by spring application provided
acceptable crabgrass control at rates tested
Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass (DIGSS)
Control in Turfgrass
• Key Findings– Spring Applications
• Dithiopyr– March, April, and May applications of dithiopyr provided
acceptable crabgrass control at rates tested– June application of dithiopyr did not provide acceptable
crabgrass control at rates tested
• Prodiamine– March and April applications of prodiamine provided acceptable
crabgrass control at rates tested– May and June applications of prodiamine did not provide
acceptable crabgrass control at rates tested
Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass (DIGSS)
Control in TurfgrassTreatment List (All treatments applied on 19-0-6 Fertilizer)
• October - Dithiopyr @ 560 g ai/ha• October - Prodiamine @ 730 g ai/ha• November - Dithiopyr @ 560 g ai/ha• November - Prodiamine @ 730 g ai/ha• November / May - Dithiopyr @ 560 fb 280 g ai/ha• November / May - Prodiamine @ 730 fb 280 g ai/ha• March – Dithiopyr @ 430 g ai/ha• March – Dithiopyr @ 560 g ai/ha• March – Prodiamine @ 730 g ai/ha• April – Dithiopyr @ 430 g ai/ha• April – Dithiopyr @ 560 g ai/ha• April – Prodiamine @ 730 g ai/ha• May – Dithiopyr @ 430 g ai/ha• May – Dithiopyr @ 560 g ai/ha• May – Prodiamine @ 730 g ai/ha• June (No Tillering) – Dithiopyr @ 430 g ai/ha• June (No Tillering) – Dithiopyr @ 560 g ai/ha• June (No Tillering) – Prodiamine @ 730 g ai/ha
Fall Applications
Spring Applications
Parts of a Box-Plot
Center 50%
0
20
40
60
80
100
120Response
+
Extreme Value
25th Percentile
MedianMean
75th PercentileUpper 25%
Lower 25%
*
*
*
*
0102030405060708090
100
9 9 9 9 9 9
+
+
+
+
+
+
78.4 54.2 87.4 51.5 99.1 82.8
Mean v alues below box, number of obs. abov e box
Treatment
% C
ontro
lFall Applications (Crabgrass Control)
A
B
AB
A A
*
0102030405060708090
100
9 9 9 9
++ +
+
99.1 87.4 83.6 93
Mean v alues below box, number of obs. abov e box
Treatment
% C
ontro
lFall/Spring Applications - Dithiopyr (Crabgrass Control)
A A A A
*
0102030405060708090
100
9 9 9
+
++
82.8 51.5 57.5
Mean v alues below box, number of obs. abov e box
Treatment
% C
ontro
lFall/Spring Applications - Prodiamine (Crabgrass Control)
AA A
* *
*
0102030405060708090
100
9 9 9 9 9 9 9 9 9 9 9 9
+
+
++
++
++
++ +
+69.1 90.7 69.2 80.9 89 76.5 83.6 93 57.5 49.4 52.3 5.5
Mean v alues below box, number of obs. abov e box
Treatment
% C
ontro
lSpring Applications (Crabgrass Control)
B
ABAB
ABA A A A A A A A
* *
*
0102030405060708090
100
9 9 9 9 9 9 9 9
+ ++ +
+
++
+69.1 69.2 80.9 76.5 83.6 57.5 49.4 5.5
Mean v alues below box, number of obs. abov e box
Treatment
% C
ontro
lSpring Applications - Dithiopyr vs Prodiamine (Crabgrass Control)
B
ABAB
AAAAA
Dimension & Barricade Granule Fall/Spring Timing Study
Untreated – Indiana (2006 – 2007)
Dimension & Barricade Granule Fall/Spring Timing Study
October 15 Application – Indiana (2006 – 2007)
(88%)Dimension @ 0.5 lb
a.i./A
(81%)Barricade @ 0.65 lb a.i./A
Dimension & Barricade Granule Fall/Spring Timing Study
November 15 Application – Indiana (2006 – 2007)
(89%)Dimension @ 0.5 lb a.i./A
(82%)Barricade @ 0.65 lb a.i./A
Dimension & Barricade Granule Fall/Spring Timing Study
November 15 fb May 15 Application – Indiana (2006 – 2007)
(91%)Dimension @ 0.5 + 0.25 lb a.i./A
(86%)Barricade @ 0.65 + 0.25 lb a.i./A
Dimension & Barricade Granule Fall/Spring Timing Study
March 15 Application – Indiana (2006 – 2007)
(65%)Dimension @ 0.38 lb a.i./A
(94%)Dimension @ 0.5 lb a.i./A
(85%)Barricade @ 0.65 lb a.i./A
Dimension & Barricade Granule Fall/Spring Timing Study
April 15 Application – Indiana (2006 – 2007)
(86%)Dimension @ 0.38 lb a.i./A
(93%)Dimension @ 0.5 lb a.i./A
(57%)Barricade @ 0.65 lb a.i./A
Dimension & Barricade Granule Fall/Spring Timing Study
May 15 Application – Indiana (2006 – 2007)
(90%)Dimension @ 0.38 lb a.i./A
(96%)Dimension @ 0.5 lb a.i./A
(9%)Barricade @ 0.65 lb a.i./A
Dimension & Barricade Granule Fall/Spring Timing Study
June 15 Application – Indiana (2006 – 2007)
(56%)Dimension @ 0.38 lb a.i./A
(47%)Dimension @ 0.5 lb a.i./A
(75%)Barricade @ 0.65 lb a.i./A
Fall and/or Spring Applications of Granular Dithiopyr and Prodiamine for Crabgrass (DIGSS)
Control in Turfgrass
• Conclusions– Dithiopyr
– Fall applications and fall application followed by spring application provided comparable crabgrass control to spring applications at rates tested
– Prodiamine– Fall applications did not provide comparable crabgrass
control to spring applications at rate tested– Fall application followed by spring application provided
better crabgrass control than spring applications at rates tested