The Influence of Classic on TSWV of Peanuts
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Transcript of The Influence of Classic on TSWV of Peanuts
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The Influence of Classic on TSWV of Peanuts
E. P. Prostko, R. C. Kemerait, W. C. Johnson, III, B. J. Brecke, and S. N. Brown
University of Georgia
Tifton
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Annual Losses To TSWV inGeorgia Peanuts, 1990-2001
Year
1990 1992 1994 1996 1998 2000 2002
% R
ed
uc
tio
n i
n C
rop
Va
lue
0
2
4
6
8
10
12
14
To
tal
los
se
s i
n $
Mil
lio
ns
0
10
20
30
40
50% Reduction in Crop ValueTotal Loss in Dollars
Peanut Tomato Spotted Wilt Team, 2001
1993 1995 1997 1999 2001
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The University of GeorgiaTomato Spotted Wilt Risk Index
• variety
• planting date
• plant population• insecticide• row pattern• tillage• others yet to be
discovered
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Classic Issues in Peanut
• 20-25% of GA acreage
• late-season beggarweed
• tolerance of new varieties
• influence on TSWV
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Objective
• evaluate the influence of Classic applications on TSWV and yield of peanut.
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Materials and Methods
• small plot techniques
• 5 locations (4-GA, 1-FL)
• GA Green, C-99R
• Classic applied 21 to 90 DAE
• TSWV ratings
• yield
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Materials and MethodsPlanting Dates
Location 2000 2001
Attapulgus, GA -- April 25
Colquitt Co., GA -- May 25
Jay, FL -- May 16
Tifton, GA May 8 May 10
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ResultsTSWV
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TSWV As Influenced By Classic Applications - 2000
19
31
37 37
28
21
0
10
20
30
40
Untreated 31 DAE 46 DAE 63 DAE 80 DAE 91 DAE
Classic Timing
TSW
V (
%)
Averaged over 2 varieties (GA Green, C-99R)* LSD (0.05) = 7+LSD (0.10) = 6
*+*+ *+
Tifton, GA
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TSWV As Influenced By Classic Applications - 2001
2116
21 22
39
2627
0
10
20
30
40
50
Classic Timing
TSW
V (
%)
Averaged over 2 varieties (GA Green, C-99R)* LSD (0.05) = 9+LSD (0.10) = 7 Tifton, GA
*+
*+
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TSWV As Influenced By Classic Applications - 2001
21 23
34
1922
34
21
0
10
20
30
40
Classic Timing
TSW
V (
%)
C-99R*LSD (0.05) = NS+LSD (0.10) = 11 Attapulgus, GA
+ +
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TSWV As Influenced By Classic Applications - 2001
13
7
1719
26
118
0
10
20
30
Classic Timing
TSW
V (
%)
GA Green* LSD (0.05) = 11+LSD (0.10) = 9 Colquitt County, GA
*+
+
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TSWV as Influenced by Classic Applications (2000-2001)
-15
-10
-5
0
5
10
15
20
0 15 30 45 60 75 90 105
Classic Timing (DAE)
Cha
nge
in T
SWV
(%
)
4 trials conducted in GAAveraged over 2 varieties (GA Green and C-99R)
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ResultsPeanut Yield
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Peanut Yield As Influenced By Classic Applications - 2000
5619
44644833
51755508
5838
0
1500
3000
4500
6000
Untreated 31 DAE 46 DAE 63 DAE 80 DAE 91 DAE
Classic Timing
lbs/
A
Averaged over 2 varieties (GA Green, C-99R)*LSD (0.05) = 561+LSD (0.10) = 467
*+ *+ *+
Tifton, GA
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Peanut Yield As Influenced By Classic Applications - 2001
3124 3079 3123 3268 3177 32933471
0
1000
2000
3000
4000
Classic Timing
lbs/
A
Averaged over 2 varieties (GA Green, C-99R)*LSD (0.05) = 354+LSD (0.10) = 296 Tifton, GA
*+ + +
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Peanut Yield As Influenced By Classic Applications - 2001
53565004 5186 5146 5427
49205274
0
1500
3000
4500
6000
Classic Timing
lbs/
A
C-99R*LSD (0.05) = 491+LSD (0.10) = 411 Attapulgus, GA
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4038
3631
3997
3079
3880
3517
4105
0
1000
2000
3000
4000
5000
Yie
ld (
lbs/
A)
Peanut Yield as Influenced by Classic Timing - 2001
Jay, FL
Averaged over 2 varieties (GA Green, C-99R)*LSD 0.05 = 554+LSD 0.10 = 463
* ++
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Peanut Yield as Influenced by Classic Applications (2000-2001)
-1500
-1300
-1100
-900
-700
-500
-300
-100
100
300
0 15 30 45 60 75 90 105
Classic Timing (DAE)
Cha
nge
in Y
ield
(lb
s/A
)
3 trials conducted in GA/1 trial conducted in FLweed-free conditions
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What about other herbicides?
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TSWV As Influenced By PRE Herbicides - 2000
26
21
26
21
0
10
20
30
Untreated Strongarm Valor Spartan
Herbicide
TSW
V (
%)
Averaged over 2 varieties (GA Green, C-99R)* LSD (0.05) = 7+LSD (0.10) = 6 Tifton, GA
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TSWV in Response to Valor Timings
34 3320
45 46
6978
0
20
40
60
80
100
Valor Timing
TSW
V (
%)
Tifton, GASeptember 13, 2001
GA GreenPlanted: May 8
bc bc
c
b b
aa
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TSWV As Influenced By Other Herbicide Applications - 2001
27
8
1621
2
23
1714
2924
7
21
0
10
20
30
40
Attapulgus Ponder Colquitt
TSW
V (
%)
Untreated Max + Bas (AE) fb Blazer (30 DAE)Max + Bas (AE) fb Cadre (30 DAE) Strongarm (60 DAE)
(LSD 0.05 - NS)(LSD 0.10 = 11)
(LSD 0.05 = 9)(LSD 0.10 = 7)
(LSD 0.05 = 11)(LSD 0.10 = 9)
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TSWV As Influenced By Ultra Blazer Applications - 2001
17
26
19
28
1721
7
21
0
10
20
30
40
Blazer Timing
TSW
V (
%)
Averaged over 2 varieties (GA Green, C99R)* LSD (0.05) = 12+LSD (0.10) = 10 Tifton, GA
*+
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Summary
• Classic can increase TSWV but not always.
• Classic/TSWV interaction can reduce yields but not always.
• Earlier applications of Classic??
• Other herbicides have not influenced TSWV.
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ACKNOWLEDGMENT
This research was partially supported through a grant provided
by the Georgia Agricultural Commodity Commission for Peanuts.
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University ofGeorgia
ExtensionWeed Science
(gaweed.com)