STINK BUG THRESHOLDS: EMPLOY AFTER 2% STINK BUG DAMAGED CONFIRMED IN BOLLWORM SCOUTING

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Cotton Insect Update 2007 Producer Update
Meetings
Jack Bacheler NCSU
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Todays topics
Thrips management - more options, better
results? New Bt cottons - actual
performance Bug management - SE Regional
Project results
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Thrips management - more options, better
results? New Bt cottons - actual
performance Bug management - SE Regional
Project results
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Lint yields best trt. vs. untreated cotton for
thrips control, Rocky Mount, NC, 2005-2006
Best
Untreated
thrips/ 5 plants
Test 1
4
3
2
5
Mean
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Lint yields best trt. vs. untreated cotton for
thrips control, Rocky Mount, NC, 2005-2006
Best
Untreated
305 lb. lint !!
thrips/ 5 plants
Test 1
2
Mean
4
3
5
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Number of thrips per 5 plants at 3.5 weeks after
planting, Rocky Mount, NC, 2001
thrips / 5 plants
At-planting treatment
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Unless emergence and grow off conditions are
good and thrips levels are low With seed
treatments do not to tempt fate as more than 3
weeks will be too late (and that probably
includes Avicta and Aeris)
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At-planting materials all new products or rates

• Gaucho Grande new rate
• Cruiser new rate
• KC791230 new Temik

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Bottom line value of thrips control options,
2005-2006 (5 tests)
Temik 3.00/ lb. Orthene 10.00/ lb.
Seed trt. 8.00/acre _at_ 800 lb./ acre and
0.60/ lb. 3.5 seed/ft. 38 rows
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Value of thrips control options in VA 2001-2004
(10 tests)
Temik 3.00/ lb. Orthene 10.00/ lb.
Seed trt. 8.00/acre _at_ 800 lb./ acre and
0.60/ lb. 3.5 seed/ft. 38 rows
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Number of immature thrips/5 plants Gaucho G.
vs. Cruiser, 2005-2006
Gaucho G. Orth.
Cruiser Orth.
thrips/5 plants
17.5
11.3
Test 1
2
Mean
4
3
5
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Cruiser and Gaucho Grande are the same in

• plant height
• plant dry weight
• need of foliar app. for thrips
• node of first square
• node of first flower
• date of 1st open boll
• date of mean open boll
• yield

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Ditto . . . for Temik 15G vs. seed treatment (
well timed foliar)

• plant height
• plant dry weight
• need of foliar app. for thrips
• node of first square
• node of first flower
• date of 1st open boll
• date of mean open boll
• yield

except for . .
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Spider mite and aphid treatments may be less
with Temik vs. seed trt. foliar
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NC acreage treated for aphids spider
mites (2004-2005 Consultants Survey approx.
20,000 acres)
Difference 2.3 fold
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NC acreage treated for aphids spider
mites (2004-2005 Consultants Survey approx.
20,000 acres)
Difference 2.3 fold 9.1
fold
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Thrips management - more options, better
results? New Bt cottons - actual
performance Bug management - SE Regional
Project results
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How effective are the new BT cottons?

• Bollgard (Cry 1 Ac)
• Bollgard II (Cry 1 Ac Cry 2 Ab)
• Widestrike (Cry 1 Ac Cry 1F)
• VIP (Cry 1 Ac Vip 3A)

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Damaged Boll Survey, 2005-2006(bollworm damage)
2006 (217 fields)
5.4
Damaged Bolls
1.3
0.43
0.17
Conventional
WideStrike
Bollgard
Bollgard II
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Damaged Boll Survey, 2005-2006(bollworm damage)
2006 (217 fields)
1/3 Rule??
5.4
Damaged Bolls
1.3
0.43
0.17
Conventional
WideStrike
Bollgard
Bollgard II
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Losses to late season insect bollworms stink
bugs by technology, 2005-2006 (n 403 fields)
67.05
31.45
30.25
26.25
Damaged Bolls
Conventional
WideStrike
Bollgard
Bollgard II
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In choosing a Bt technology, pay most attention
to varietal performance, particularly when
choosing between 2-gene constructs (BG2,
WideStrike and VIP).
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Thrips management- more options, better
results? New Bt cottons - actual
performance Bug management - SE Regional
Project results
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Bollgard vs. conventional cottonbug damage to
bolls in NC, 1996 - 2006
Bollgard
Conventional
stink bug damaged bolls
Year
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Bollgard vs. conventional cottonbug damage to
bolls in NC, 1996 - 2006
Bollgard
Conventional
stink bug damaged bolls
??
Year
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Graduated protection tests 14
o
NC
o
o
o
o
o
o
o
SC
GA
o
o
O 2006 O 2005 O 2004
o
o
o
o
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Progressive bug protection test diagram
Number of applications / plot
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Green, brown and southern green stink bugs at
selected test sites, 2004-2006
Southern Green
Green
Brown
NC 04
NC 05
NC 05
NC 05
NC 05
NC 05
GA 05
SC 06
SC 06
GA 06
GA 06
NC 06
NC 06
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Seasonal mean number of plant bugs/ 6 row ft. in
check, 2005-2006 (adults nymphs)
of plant bugs / 6 ft.
NC 05
NC 05
NC 05
NC 05
NC 05
GA 05
SC 06
SC 06
GA 06
GA 06
NC 06
NC 06
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Percent dirty blooms means for 1st five wks of
blooming in check, 2004-2006
Average dirty blooms
NC 04
NC 05
NC 05
NC 05
NC 05
NC 05
GA 05
GA 06
GA 06
NC 06
NC 06
SC 06
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Retention of upper squares means for 1st five
wks of blooming in check, 2005-2006
square retention
NC 05
NC 05
NC 05
NC 05
NC 05
GA 05
SC 06
GA 06
GA 06
NC 06
NC 06
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Boll age and size vs. yield loss
3.5 weeks bug-safe
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Boll age and size vs. yield loss
(approx. 1.25 diam.)
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Percentage of bolls with diameters gt 1.25 inches
per week of blooming, Scotland Co., NC, 2005
bolls gt 1.25
Weeks past 1st bloom
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Percentage of bolls with diameters gt 1.25 inches
per week of blooming, Wayne Co., NC, 2004
bolls gt 1.25
Week of bloom
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Percentage of bolls with diameters gt 1.25 inches
per week of blooming, Barnwell Co., SC, 2006
bolls gt 1.25
Week of bloom
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Bug damage to bolls extreme variability
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Bollworm vs. stink bug damage to bolls and yield
loss in NC (n 10 13 tests)
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Stink bug damage to bolls vs. yield Wayne Co.,
2004
Pounds of lint cotton / acre
y -7.076 x 1870.7 R2 0.895
Boll damage
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Yield change from spray at designated weeks of
bloom, NC GA, 2004 - 2006 (n 14 tests)
62.2
Lb. lint / acre
17.1
15.3
-7.0
-9.2
-21.9
1-2
2-3
3-4
4-5
5-6
6-7
Week of bloom
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Dynamic threshold rationale
Bolls gt 1.25
Percent boll sizes gt 1.25
1
2
3
4
5
6
7
8
9
Week of bloom
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Possible Stink Bug Thresholds
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Stink bug threshold evaluation study NC, GA and
SC (9 sites, 2006)
a
ab
bc
c
115
46
85
Lb. lint / acre
0
1.1 app.
0 app.
1.9 app.
6.1 app.
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Dynamic (30, 30, 10,10,10, 30, 50)
Untreated
Weekly
Net 0.65/lb. 9.00/appl.
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Stink bug threshold evaluation study NC, GA and
SC (9 sites, 2006)
a
ab
bc
c
115
46
85
Lb. lint / acre
19.75
0
1.1 app.
0 app.
1.9 app.
6.1 app.
20
Dynamic (30, 30, 10,10,10, 30, 50)
Untreated
Weekly
Net 0.65/lb. 9.00/appl.
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Stink bug threshold evaluation study NC, GA and
SC (9 sites, 2006)
a
ab
bc
c
115
46
85
Lb. lint / acre
19.75
19.90
0
1.1 app.
0 app.
1.9 app.
6.1 app.
20
Dynamic (30, 30, 10,10,10, 30, 50)
Untreated
Weekly
Net 0.65/lb. 9.00/appl.
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Stink bug threshold evaluation study NC, GA and
SC (9 sites, 2006)
a
ab
bc
c
115
46
85
Lb. lint / acre
38.25
19.75
19.90
0
1.1 app.
0 app.
1.9 app.
6.1 app.
20
Dynamic (30, 30, 10,10,10, 30, 50)
Untreated
Weekly
Net 0.65/lb. 9.00/appl.
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Stink bug threshold evaluation study NC, GA and
SC (9 sites, 2006)
a
ab
bc
c
115
46
85
Lb. lint / acre
38.25
19.75
19.90
0
1.1 app.
0 app.
1.9 app.
6.1 app.
20
Dynamic (30, 30, 10,10,10, 30, 50)
Untreated
Weekly
Net 0.65/lb. 9.00/appl.
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Identifying Practical Knowledge and Solutions
for Managing The Sucking-Bug Complex In Cotton
Research In The Southeast Region
Southeast State Support Committees