1) Trials from 2005-2011 evaluated insecticide efficacy on stink bugs in cotton in Georgia. 2) High rates of pyrethroids, pyrethroid/neonic premixes, and Bidrin provided excellent control of southern green stink bugs while Bidrin provided the best control of both southern green and brown stink bugs. 3) Neonicotinoids and low-medium rates of pyrethroids provided fair control of southern green stink bugs but poor control of brown stink bugs.

1. Summary of Stink Bug Efficacy Trials
(2005-2011) in Irwin County, Georgia
Edwards,* Roberts, P.M. R.P.1; 2
1 Cooperative Extension, University of Georgia, 107 W. Fourth Street Ocilla, GA 31774
2 Department of Entomology University of Georgia, Tifton, GA 31793
ABSTRACT Southern Green Stink Brown Stink Bug
Bug (Euschistus spp.)
Stink bugs are a primary insect pest of Georgia
Insecticide % Control CV (n) % Control CV (n)
cotton. Stink bug populations vary by year, but
since the transition to transgenic Bt cotton their Neonic 70 38 7 20 106 7
presence has negatively impacted cotton yield Pyrethroid
(low-medium) 86 19 13 33 86 19
and grade. Each year from 2005 - 2011 Pyrethroid
numerous insecticides have been evaluated in (high) 97 7 12 40 64 16
Irwin County GA to determine their effectiveness Pyrethroid/Neonic
(premix) 94 11 7 47 66 12
in controlling stink bugs in cotton. Trials were Percent Control 3-4 DAT
Southern Green and Brown (Euschistus spp.) Stink Bugs
conducted in commercial cotton fields. Plots were 97 97 Bidrin 97 7 9 70 22 12
100 94
arranged so that each plot bordered peanuts 86 Neonic Pyrethroids (low-medium)
since stink bug populations are traditionally 80 100 100
Percent Control
Percent Control
Percent Control 70 70 80 80
higher in cotton nearest the peanut planting 60
40
60
40
compared with more interior areas of fields. A 60
47
20
0
20
0
high clearance plot sprayer was used to apply 40
40
1 2 3 4 5 6 7 8 9 10111213141516171819
Southern Green Observations
1 2 3 4 5 6 7 8 9 10111213141516171819
Southern Green Observations
33
various insecticides on the four rows adjacent to
20 Pyrethroids (high) Pyrethroid/Neonic Premix
the peanut planting. Stink bugs were counted by 20 100 100
Percent Control
Percent Control
life stage and species 3 days after treatment.
80 80
60 60
0 40 40
Pyrethriods, pyrethroid/neonic premix and OPs Neonic Pyrethroid (low- Pyrethroid Pyr/Neonic Bidrin
20
0
20
0
provided good to excellent control of southern med) (high) SG Brown 1 2 3 4 5 6 7 8 9 10111213141516171819
Southern Green Observations
1 2 3 4 5 6 7 8 9 10111213141516171819
Southern Green Observations
green stink bugs. However, organophosphates
Bidrin
such as Bidrin provided improved control of 100
Percent Control
brown stink bug species. 80
60
40
20
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Southern Green Observations
Summary and scatter plots of observations (n) of
percent southern green and brown stink bug control.
RESULTS
METHODS Southern Green Stink Bug: High rates of pyrethroids, pyrethroid/neonic premixes, and Bidrin provided excellent
 14 replicated trials (2005-2011) control of southern green stink bug and had the lowest CVs. Low-medium rates of pyrethroids provided good control
 Randomized Complete Block (4 Reps) of southern green but were slightly more variable when compared with high rates of pyrethroids. Neonics provided fair
 Treatments applied with a high clearance control of southern green stink bug.
sprayer calibrated to deliver 10 gpa.
 Treatments evaluated with a black drop cloth Brown Stink Bug (Euschistus spp.): Bidrin provided the highest percent control of brown stink bug and had the
3-4 DAT, 12 row feet were sampled and stink lowest CV. Neonics, pyrethroids, and pyrethroid/neonic premixes provided poor to fair control and were less
bugs were enumerated species and life stage. consistent when compared with Bidrin.
 Mean percent control and the coefficient of
variation were calculated for neonicotinoids, In summary, Bidrin provided the best control of mixed populations of southern green and brown stink bugs.
pyrethroids (low-medium and high rates), Pyrethroids tended to provided good to excellent control of southern green but only fair control of brown stink bugs.
pyrethroid/neonic premixes, and Bidrin. Neonics were more efficacious on southern green compared with brown stink bugs.