Insecticide Efficacy of Foliar Applications for Tarnished Plant Bug and Other Key Insect Pests of Cotton in the Mississippi Delta Dr. James Robbins Delta.

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Presentation transcript:

Insecticide Efficacy of Foliar Applications for Tarnished Plant Bug and Other Key Insect Pests of Cotton in the Mississippi Delta Dr. James Robbins Delta Research and Extension Center Stoneville, MS

Dry and Hot Weather From May Through October 2006 May – July Rainfall of 6.45 Inches May – July Rainfall of 6.45 Inches August – September Rainfall of 4.28 Inches August – September Rainfall of 4.28 Inches Temperatures in May Averaged Above 90 Degrees 11 Days Temperatures in May Averaged Above 90 Degrees 11 Days Temperatures June – August Were 90 to 102 For 75 Days Temperatures June – August Were 90 to 102 For 75 Days Irrigation Started Early and Continued All Season Irrigation Started Early and Continued All Season

Cotton Research Funding Provided By Bayer Bayer Cotton Incorporated Cotton Incorporated Chemtura Chemtura FMC FMC Syngenta Syngenta USDA ARS USDA ARS

All Tests Were Conducted at the Delta Research and Extension Center Stoneville Mississippi Experiments Were Randomized Complete Block of 4 Replications Experiments Were Randomized Complete Block of 4 Replications Treatments Were Feet Long Planted on 40 Inch Beds and 8-16 Rows Wide Treatments Were Feet Long Planted on 40 Inch Beds and 8-16 Rows Wide Applications Were With BackPack CO2 at 10 GPA or MelRoe 220 Spra Coupe at GPA With Cone Jet Tips Applications Were With BackPack CO2 at 10 GPA or MelRoe 220 Spra Coupe at GPA With Cone Jet Tips

Tarnished Plant Bug Observations From Samples in Late Planted Cotton, Stoneville, Ms Treatment 4 DAT 1 A N 4 DAT 1 A N 4 DAT 2 A N 4 DAT 2 A N %Reduction of Adults %Reduction of Nymphs Untreated Trimax Diamond 4 oz/A Diamond 6 oz/A Spitfire 0.3 lb/A + Diamond 4 oz Orthene 0.75lb Carbine Centric Treatments 8/10 and 8/18; planted 6/3

Below Threshold Tarnished Plant Bug Tests at Stoneville Mississippi Treatment 25 July A N 25 July A N 29 July A N 29 July A N Yields Lb/A Yields Lb/A Untreated Centric 1.25 oz/A Centric 2 oz/A Diamond 4 oz/A Diamond 6 oz/A Diamond 9 oz/A Carbine 2 oz/A Orthene.33 lb/A Numbers are for 100 sweeps. One application on 07/26

Tarnished Plant Bug Tests At Threshold Stoneville, Ms Treatments 1 Aug A N 1 Aug A N 5 Aug A N 5 Aug A N 15 Aug A N 15 Aug A N Yields Lb/A Yields Lb/A Untreated Diamond 9 oz/A Diamond 6 oz/A + Bidrin 0.25 lb Centric 2 oz/A Orthene 0.5lb/A Centric 1.25 oz +Diamond 4 oz Centric 2 oz + Diamond 9 oz Numbers are per 100 sweeps; applied treatments 8/2

Insecticide Results For Stink Bugs in Late Planted Cotton at the Delta Research and Extension Center Stoneville, Ms Treatments 15 Sept A N 15 Sept A N 20 Sept A N 20 Sept A N Spitfire 0.5 lb/A 4 gsb 0 8 gsb 0 Baythroid 0.033lb ai/A 0 0 Karate Z 0.033lb ai/A 0 0 Mustang Max ai bsb 0 Spitfire Diamond 6 oz/A 2 gsb 0 2 bsb + 5 gsb 2 gsb Untreated 14 gsb + 6 bsb 8 gsb 24 gsb + 8 bsb 14gsb Green stink bug = gsb; Brown stink bug = bsb; applied treatments 9/12

Armyworm Laboratory Ingestion Tests Treatments # Dead 48 hrs # Dead 72 Hrs # Dead 96 Hrs Baythroid Diamond 9 oz Exp # V Exp # V Untreated Ten 3 rd instar larvae introduced to green beans treated with each insecticide.

SUMMARY COMMENTS Tests Show Plant Bugs Are Much More Tolerant/Resistant to Organophosphates and Remain Hard to Kill With Pyrethroids in Many Locations Tests Show Plant Bugs Are Much More Tolerant/Resistant to Organophosphates and Remain Hard to Kill With Pyrethroids in Many Locations No Real Hard to Kill Populations With Neonics So Far No Real Hard to Kill Populations With Neonics So Far There Are Some New Chemistries Available There Are Some New Chemistries Available