Edwards for 2012 nacaa annual meeting summary of stink bug insecticide efficacy trials 2006 2011 in...
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ABSTRACT Stink bugs are a primary insect pest of Georgia cotton. Stink bug populations vary by year, but since the transition to transgenic Bt cotton their presence has negatively impacted cotton yield and grade. Each year from 2005 - 2011 numerous insecticides have been evaluated in Irwin County GA to determine their effectiveness in controlling stink bugs in cotton. Trials were conducted in commercial cotton fields. Plots were arranged so that each plot bordered peanuts since stink bug populations are traditionally higher in cotton nearest the peanut planting compared with more interior areas of fields. A high clearance plot sprayer was used to apply various insecticides on the four rows adjacent to the peanut planting. Stink bugs were counted by life stage and species 3 days after treatment. Pyrethriods, pyrethroid/neonic premix and OPs provided good to excellent control of southern green stink bugs. However, organophosphates such as Bidrin provided improved control of brown stink bug species. Summary of Stink Bug Efficacy Trials (2005-2011) in Irwin County, Georgia Edwards,* R.P. 1 ; Roberts, P.M. 2 1 Cooperative Extension, University of Georgia, 107 W. Fourth Street Ocilla, GA 31774 2 Department of Entomology University of Georgia, Tifton, GA 31793 METHODS 14 replicated trials (2005-2011) Randomized Complete Block (4 Reps) Treatments applied with a high clearance sprayer calibrated to deliver 10 gpa. Treatments evaluated with a black drop cloth 3-4 DAT, 12 row feet were sampled and stink bugs were enumerated species and life stage. Mean percent control and the coefficient of variation were calculated for neonicotinoids, pyrethroids (low-medium and high rates), pyrethroid/neonic premixes, and Bidrin. RESULTS Southern Green Stink Bug: High rates of pyrethroids, pyrethroid/neonic premixes, and Bidrin provided excellent control of southern green stink bug and had the lowest CVs. Low-medium rates of pyrethroids provided good control of southern green but were slightly more variable when compared with high rates of pyrethroids. Neonics provided fair control of southern green stink bug. Brown Stink Bug (Euschistus spp.): Bidrin provided the highest percent control of brown stink bug and had the lowest CV. Neonics, pyrethroids, and pyrethroid/neonic premixes provided poor to fair control and were less consistent when compared with Bidrin. In summary, Bidrin provided the best control of mixed populations of southern green and brown stink bugs. Pyrethroids tended to provided good to excellent control of southern green but only fair control of brown stink bugs. Neonics were more efficacious on southern green compared with brown stink bugs. 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10111213141516171819 Percent Control Observations Pyrethroids (low-medium) Southern Green 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10111213141516171819 Percent Control Observations Pyrethroids (high) Southern Green 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10111213141516171819 Percent Control Observations Pyrethroid/Neonic Premix Southern Green 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10111213141516171819 Percent Control Observations Bidrin Southern Green 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10111213141516171819 Percent Control Observations Neonic Southern Green 70 86 97 94 97 20 33 40 47 70 0 20 40 60 80 100 Neonic Pyrethroid (low- med) Pyrethroid (high) Pyr/Neonic Bidrin Percent Control Percent Control 3-4 DAT Southern Green and Brown (Euschistus spp.) Stink Bugs SG Brown Insecticide Southern Green Stink Bug Brown Stink Bug (Euschistus spp.) % Control CV (n) % Control CV (n) Neonic 70 38 7 20 106 7 Pyrethroid (low-medium) 86 19 13 33 86 19 Pyrethroid (high) 97 7 12 40 64 16 Pyrethroid/Neonic (premix) 94 11 7 47 66 12 Bidrin 97 7 9 70 22 12 Summary and scatter plots of observations (n) of percent southern green and brown stink bug control.
Transcript of Edwards for 2012 nacaa annual meeting summary of stink bug insecticide efficacy trials 2006 2011 in...
ABSTRACT Stink bugs are a primary insect pest of Georgia cotton. Stink bug populations vary by year, but since the transition to transgenic Bt cotton their presence has negatively impacted cotton yield and grade. Each year from 2005 - 2011 numerous insecticides have been evaluated in Irwin County GA to determine their effectiveness in controlling stink bugs in cotton. Trials were conducted in commercial cotton fields. Plots were arranged so that each plot bordered peanuts since stink bug populations are traditionally higher in cotton nearest the peanut planting compared with more interior areas of fields. A high clearance plot sprayer was used to apply various insecticides on the four rows adjacent to the peanut planting. Stink bugs were counted by life stage and species 3 days after treatment. Pyrethriods, pyrethroid/neonic premix and OPs provided good to excellent control of southern green stink bugs. However, organophosphates such as Bidrin provided improved control of brown stink bug species.
Summary of Stink Bug Efficacy Trials (2005-2011) in Irwin County, Georgia
Edwards,* R.P.1; Roberts, P.M. 2
1 Cooperative Extension, University of Georgia, 107 W. Fourth Street Ocilla, GA 31774 2 Department of Entomology University of Georgia, Tifton, GA 31793
METHODS 14 replicated trials (2005-2011) Randomized Complete Block (4 Reps) Treatments applied with a high clearance sprayer calibrated to deliver 10 gpa. Treatments evaluated with a black drop cloth 3-4 DAT, 12 row feet were sampled and stink bugs were enumerated species and life stage. Mean percent control and the coefficient of variation were calculated for neonicotinoids, pyrethroids (low-medium and high rates), pyrethroid/neonic premixes, and Bidrin.
RESULTS Southern Green Stink Bug: High rates of pyrethroids, pyrethroid/neonic premixes, and Bidrin provided excellent control of southern green stink bug and had the lowest CVs. Low-medium rates of pyrethroids provided good control of southern green but were slightly more variable when compared with high rates of pyrethroids. Neonics provided fair control of southern green stink bug. Brown Stink Bug (Euschistus spp.): Bidrin provided the highest percent control of brown stink bug and had the lowest CV. Neonics, pyrethroids, and pyrethroid/neonic premixes provided poor to fair control and were less consistent when compared with Bidrin. In summary, Bidrin provided the best control of mixed populations of southern green and brown stink bugs. Pyrethroids tended to provided good to excellent control of southern green but only fair control of brown stink bugs. Neonics were more efficacious on southern green compared with brown stink bugs.
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Pyrethroids (low-medium)
Southern Green
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Pyrethroids (high)
Southern Green
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Pyrethroid/Neonic Premix
Southern Green
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Bidrin
Southern Green
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Neonic
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Neonic Pyrethroid (low-med)
Pyrethroid(high)
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Percent Control 3-4 DAT Southern Green and Brown (Euschistus spp.) Stink Bugs
SG Brown
Insecticide
Southern Green Stink Bug
Brown Stink Bug (Euschistus spp.)
% Control CV (n) % Control CV (n) Neonic 70 38 7 20 106 7 Pyrethroid (low-medium) 86 19 13 33 86 19 Pyrethroid (high) 97 7 12 40 64 16 Pyrethroid/Neonic (premix) 94 11 7 47 66 12 Bidrin 97 7 9 70 22 12
Summary and scatter plots of observations (n) of percent southern green and brown stink bug control.
![The southern green stink bug [ Nezara viridula (L.) ] and the brown stink bug](https://static.fdocuments.in/doc/165x107/56812d5a550346895d92608c/the-southern-green-stink-bug-nezara-viridula-l-and-the-brown-stink-bug.jpg)
