Grower and Professional Meeting Slides

1
North Carolina Cotton Acreage 1972 - 2004
Bollgard Cotton Acreage
Total Cotton Acreage
Pre-Eradication
Post-Eradication
Acreage (x 1,000)
Year
2
North Carolina Cotton Acreage 1996 - 2004
Bollgard Cotton Acreage
Conventional Cotton Acreage
Acreage (x 1,000)
Year
3
Bollgard Cotton Adoption in NC 1996 - 2004
(Percent of total cotton acreage)
70
83
65
73
55
Bollgard Acres (x 1000)
20
13
3
2.8
Year
4
Bollgard Cotton Acreage inNorth Carolina, 1996 -
2004
Acreage

Year
State
Bollgard
Bollgard
5
Efficacy of New Insecticides and Bollgard Cotton
Against Selected Caterpillar Species
Estimates of various entomologists throughout
the cotton belt. Steward may show some
plant bug and stink bug activity.
G good activity (standard treatment) G-
slightly worse G slightly better F fair
activity P poor or no activity U unknown
limited data.
BW bollworm TBW tobacco budworm BAW beet
armyworm FAW fall armyworm SL/CL soybean
cabbage loopers ECB European corn borer CW
cut worm
6
Total Boll Damage to Bollgard and Conventional
Cotton in NC, 1996 - 2004
Damaged Bolls
Year
7
Insecticide Applications on Bollgard Cotton in
NC, 1996 - 2004
Mean Apps.
0.95
0.57
0.48
1.24
0.67
1.02
1.11
0.92
1.24
Percentage
0 Apps.
1 Apps.
2 Apps.
3 Apps.
8
Bollgard vs. Conventional Cotton Bollworm
Damage to Bolls in NC, 1996 - 2004
Damaged Bolls
Year
9
Bollgard vs. Conventional CottonStink Bug
Damage to Bolls in NC, 1996 - 2003
Bollgard (x 2.96)
Conventional (x 1.04)
Damaged Bolls
Year
10
Bollgard vs. Conventional Cotton Number of Late
Season Insecticide Applications in NC, 1996 - 2003
No. of Applications
Year
11
Bollworm and Stink Bug Damage to Bolls in
Bollgard Cotton in NC, 1996 - 2003
Damaged Bolls
Year
12
Efficacy of Untreated DP 50, DP 50 B DP 50 B
IIAgainst Bollworms in North Carolina, 2000
Boll Damage
DP 50B II
DP 50
DP 50B
13
Efficacy of Untreated DP 50, DP 50 B DP 50 B
IIAgainst Stink Bugs in North Carolina, 2000
Boll Damage
DP 50B II
DP 50
DP 50B
14
Cost of Late-Season Insect ControlBollgard vs
Conventional Cotton in NC, 1996-2003
1 - Varies according to seed rate and row
spacing. 2 - Insecticide Application 7.50 3
- Damage 1 boll damage 12 lb. lint/acre
cotton 0.65/lb. 4 - Correct scouting of Bt
cotton should be more labor intensive.
15
Comparison of Selected Bollworm Thresholds on
Bollgard Cotton, 1997-1999
16
Bollgard Threshold Suggestions

• 3 larvae, 1/8 inch or larger, on or in
  
  squares, blooms, tags
  or bolls.
• 2 larvae on two consecutive scouting trips.
• 1 larvae on three consecutive scouting trips.
• 75 to 100 eggs/100 terminals, or 15 to 20
  eggs on fruit.

17
Boll Damage To 16 Selected Bollgard Varieties,
Rocky Mount, 1999
Bollgard varieties untreated.
Continued..
18
Boll Damage To 16 Selected Bollgard Varieties,
Rocky Mount, 1999
Continued..
1 pyrethroid application Bollgard varieties
untreated.
19
Comparison of Tarnished Plant Bug
LevelsFollowing Treatment of Tracer or
Pyrethroid, 1999
Plant Bugs (adults nymphs)
Location
Tracer
Pyrethroid
Union
16
0
Northampton A
0
0
Northampton B
2
0
Sampson
13
0
Bladen
5
0
Total
36
0
Standard 15 diameter Sweep net 10 total Bt
fields sampled 1250 total sweeps / treatment.
20
Toxin Expression In Squares
First Bloom
100
90
80
70
60
50
Cry1Ac equivalents (ug/g dry wgt)
40
30
20
10
0
6/24
7/4
7/14
7/24
8/3
8/13
8/23
9/2
9/12
Tobacco Budworm Bioassay
21
Effect of Disruptive Insecticide Spray on Yield
in Untreated Bollgard Cotton in North Carolina,
1996-2000
Yield (lb. lint / acre)
22
Effect of Disruptive Insecticide Spray on Boll
Damage in Untreated Bollgard Cotton in North
Carolina, 1996-2000
Damaged Bolls
Onslow 1995
Onslow 1995
Onslow 1995
Onslow 1998
Onslow 1999
Onslow 2000
Avg.
Bollgard Untreated
Bollgard Orthene (Disruption)
23
Effect of Disruptive Insecticide Spray on Yield
in Untreated Bollgard Cotton in North Carolina,
1996-2000
Yield (Lb. Lint / Acre
Onslow 1995
Onslow 1995
Onslow 1995
Onslow 1998
Onslow 1999
Onslow 2000
Avg.
Bollgard Untreated
Bollgard Orthene (Disruption)
24
Bollworm Damage to Bolls by NC RegionBollgard vs
Conventional, 1996
Damaged Bolls
Central S.E. Coastal Plain
Northeast
Western Piedmont
Southern
25
Relative Amount of B.t. Needed to Control
Certain Cotton Pests.
B.t. Dosage Expression for Control (Cry-1A(c))
Cotton Leaf Worm European Corn Borer
Tobacco Budworm
Pink Bollworm
26
Insect Shifts with Bollgard Cotton
Bollworms Budworms Europ. Corn Borers
Thrips Cotton Aphids Early Plant Bugs
Stink Bugs Late Plant Bugs Leaf-footed Bugs
27
Boll Damage from Bollworms and Stink Bugs in
Untreated DP-50, DP-50B, and DP-50BII in Hoke and
Wilson Co., NC (2000)
Bollworm
Stink Bug
Damage Bolls
2.7 a
2.4 ab
2.1 a
0.7 a
0.0 b
28
Number of Beet Armyworm Feeding Holes / 10 leaves
in Conv., vs. BG, vs. BGII Cotton
89.8 a
T 3 apps. of Karate _at_ 0.04 lb (AI)/acre
Treated Untreated
44.8 b
37.3 b
No. Holes / 10 Leaves
16.3 bc
4.3 c
3.5 c
29
Comparative Boll Damage from Bollworms in DP-50,
DP-50B, and DP-50BII in NC (4 tests 2000-2002)
T 3-5 pyrethroid apps/test
28.8 a
Damage Bolls
4.8 b
3.5 a
0.0 b
0.2 c
0.5 ab
30
Comparative Live Bollworms in DP-50, DP-50B, and
DP-50BII (4 tests 2000-2002)
7.0 a
Damage Bolls
1.5 ab
0.3 a
0.0 a
0.0 a
0.0 a