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Edwards for 2012 nacaa annual meeting summary of stink bug insecticide efficacy trials 2006 2011 in irwin county georgia

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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.

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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.

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Edwards for 2012 nacaa annual meeting summary of stink bug insecticide efficacy trials 2006 2011 in irwin county georgia

  • 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.