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
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
The University of GeorgiaTomato Spotted Wilt Risk Index
• variety
• planting date
• plant population• insecticide• row pattern• tillage• others yet to be
discovered
Classic Issues in Peanut
• 20-25% of GA acreage
• late-season beggarweed
• tolerance of new varieties
• influence on TSWV
Objective
• evaluate the influence of Classic applications on TSWV and yield of peanut.
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
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
ResultsTSWV
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
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
*+
*+
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
+ +
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
*+
+
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)
ResultsPeanut Yield
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
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
*+ + +
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
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
* ++
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
What about other herbicides?
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
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
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)
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
*+
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.
ACKNOWLEDGMENT
This research was partially supported through a grant provided
by the Georgia Agricultural Commodity Commission for Peanuts.
University ofGeorgia
ExtensionWeed Science
(gaweed.com)
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