Open DiscussionOpen Discussion“Stink Bug Movement, “Stink Bug Movement,

Sampling, Damage and Controls Sampling, Damage and Controls – What We Have Learned in – What We Have Learned in

Recent Years”Recent Years”

2006 GA PAC/ACAA2006 GA PAC/ACAAAnnual MeetingAnnual Meeting

Dothan, AlDothan, AlFebruary 15-16,2006February 15-16,2006

Regional Stink BugRegional Stink Bug ProjectProjectThreshold StudyThreshold StudyHeadland, Al 2005Headland, Al 2005

Three ThresholdsThree Thresholds

1. Untreated1. Untreated

2. 20% Damage2. 20% Damage

3. Bug-Free (weekly sprays)3. Bug-Free (weekly sprays)

Objective:Objective:

To Correlate various stink bug numbers To Correlate various stink bug numbers to boll damage levels. To compare drop to boll damage levels. To compare drop cloth and boll crushing as sampling cloth and boll crushing as sampling techniques. To measure control residual techniques. To measure control residual under a continuous stink bug under a continuous stink bug reinfestation situation. To measure yield reinfestation situation. To measure yield losses with different threshold levels. losses with different threshold levels. Document cotton quality losses from Document cotton quality losses from stink bug damage.stink bug damage.

Methods:Methods: Planted 8 rows of DPL-543 BGII/RR cotton Planted 8 rows of DPL-543 BGII/RR cotton

through the middle of peanut field at through the middle of peanut field at Wiregrass Research and Extension Wiregrass Research and Extension Center, Headland Al. Three thresholds Center, Headland Al. Three thresholds replicated from times in 90 ft. plots. replicated from times in 90 ft. plots. Sampled 12 row foot by drop cloth and Sampled 12 row foot by drop cloth and pulled 10 quarter size bolls per plot weekly pulled 10 quarter size bolls per plot weekly from July 19( 3from July 19( 3rdrd week of bloom) to Sept. week of bloom) to Sept. 8. Harvested on October 21. Seed cotton 8. Harvested on October 21. Seed cotton samples sent to Tifton GA. for ginning and samples sent to Tifton GA. for ginning and quality measurements.quality measurements.

Treatments Applied and Dates:Treatments Applied and Dates:Bug FreeBug Free

July 19 Bidrin 0.5 lb. + Karate .0325 (1 to 64)July 19 Bidrin 0.5 lb. + Karate .0325 (1 to 64)July 26 Bidrin 0.5 lb. + Karate .0325July 26 Bidrin 0.5 lb. + Karate .0325Aug. 2 Bidrin 0.38lb. + Karate .0325Aug. 2 Bidrin 0.38lb. + Karate .0325Aug. 8 Bidrin 0.38lb. Aug. 8 Bidrin 0.38lb. Aug.19 Bidrin 0.38 lb.Aug.19 Bidrin 0.38 lb.Aug.26 Bidrin 0.38 lb. + Karate .0325Aug.26 Bidrin 0.38 lb. + Karate .0325Sept. 8 Bidrin 0.38 lb.Sept. 8 Bidrin 0.38 lb.

20% Damage20% DamageJuly 19 Bidrin 0.5 lb. + Karate .0325July 19 Bidrin 0.5 lb. + Karate .0325July 26 Bidrin 0.5 lb. + Karate .0325July 26 Bidrin 0.5 lb. + Karate .0325Aug. 19 Bidrin 0.38 lb. Aug. 19 Bidrin 0.38 lb. Aug .26 Bidrin 0.38 lb. + Karate .0325Aug .26 Bidrin 0.38 lb. + Karate .0325Sept.8 Bidrin 0.38 lb.Sept.8 Bidrin 0.38 lb.

UntreatedUntreatedNo treatments made.No treatments made.

% Stink Bug Damaged Bolls and % Stink Bug Damaged Bolls and Number Stink Bugs/12 row Ft.Number Stink Bugs/12 row Ft.

Untreated Untreated 20% Damage 20% Damage Stink Bug Free Stink Bug Free

%Damage%Damage #SB#SB %Damage%Damage #SB#SB %Damage%Damage #SB#SB

July 19July 19 18 0.8 18 0.8 18 18 0.8 18 0.8 18 0.80.8

July 26 97 12.2 57 3.2 35 0.7July 26 97 12.2 57 3.2 35 0.7Aug. 2 87 10.5 27 0.5 22 0Aug. 2 87 10.5 27 0.5 22 0Aug. 8 97 7.0 10 0.75 5 0Aug. 8 97 7.0 10 0.75 5 0Aug. 16 90 5.0 40 7.7 12 0.5Aug. 16 90 5.0 40 7.7 12 0.5Aug. 23 87 5.8 38 0.1 25 0Aug. 23 87 5.8 38 0.1 25 0Aug. 30 90 -- Aug. 30 90 -- 8 8 -- -- 10 -- 10 -- Sept. 6 Sept. 6 85 --___________2_______--__________2_____ --_ 85 --___________2_______--__________2_____ --_ Average 91 8.1 30 2.5 16 0.2Average 91 8.1 30 2.5 16 0.2

Wiregrass Stink Bug Threshold TestWiregrass Stink Bug Threshold Test% of Bolls Damaged% of Bolls DamagedHeadland, AL 2005Headland, AL 2005

0102030405060708090

100

7/1

9/0

5

7/2

6/0

5

8/2

/05

8/9

/05

8/1

6/0

5

8/2

3/0

5

8/3

0/0

5

9/6

/05

Unsprayed

UniversityThreshold

Bug Free

Bug Free: 7applications

Univ.Threshold: 5 applications

Wiregrass Stink Bug Threshold TestWiregrass Stink Bug Threshold Test# of Stink Bugs/ 12 Row Feet# of Stink Bugs/ 12 Row Feet

Headland, AL 2005Headland, AL 2005

0

2

4

6

8

10

12

14

7/1

9/0

5

7/2

6/0

5

8/2

/05

8/9

/05

8/1

6/0

5

8/2

3/0

5

8/3

0/0

5

9/6

/05

Unsprayed

UniversityThreshold

Bug Free

Bug Free: 7 applications

Univ. Threshold: 5 applications

Stink Bug Threshold Test Stink Bug Threshold Test Headland, AlHeadland, Al

0

1000

2000

7 app. (SB Free)

5 app. (Univ.

Threshold)

untreated

Yield-Yield-(lbs. lint)(lbs. lint)

Variety: DPL-543 BG II/RRVariety: DPL-543 BG II/RR

(+$726)(+$726)

(+$556)(+$556)

263263

13751375

17141714

Other Information About Other Information About Stink Bugs as Cotton Pests:Stink Bugs as Cotton Pests:1.1. Life CycleLife Cycle2.2. Damage StageDamage Stage3.3. Predicting severity of stink bug yearPredicting severity of stink bug year4.4. Movement from crop to crop (corn vs. peanuts)Movement from crop to crop (corn vs. peanuts)5.5. Movement within cropMovement within crop6.6. Residual Control with the recommended insecticidesResidual Control with the recommended insecticides7.7. Border SpraysBorder Sprays8.8. Most critical weeks of seasonMost critical weeks of season9.9. When it is boll safeWhen it is boll safe10.10. When to begin samplingWhen to begin sampling11.11. How to select a bollHow to select a boll

(size, soft and not hard)(size, soft and not hard)12.12. What to look for inside bollWhat to look for inside boll

(crush and peel)(crush and peel)13.13. Bolls to sample per field (25-50)Bolls to sample per field (25-50)