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

Published byMyles Briggs Modified over 8 years ago

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Presentation on theme: "Insecticide Efficacy of Foliar Applications for Tarnished Plant Bug and Other Key Insect Pests of Cotton in the Mississippi Delta Dr. James Robbins Delta."— Presentation transcript:

1 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

2 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

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

4 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 30-100 Feet Long Planted on 40 Inch Beds and 8-16 Rows Wide Treatments Were 30-100 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 10-15 GPA With Cone Jet Tips Applications Were With BackPack CO2 at 10 GPA or MelRoe 220 Spra Coupe at 10-15 GPA With Cone Jet Tips

5 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 10 10 40 15 Trimax 0.03 + Diamond 4 oz/A 15 5 8 2 80 80 87 87 Diamond 6 oz/A 25 5 5 0 87 87 100 100 Spitfire 0.3 lb/A + Diamond 4 oz 12 2 13 5 68 68 67 67 Orthene 0.75lb 38 20 20 5 50 50 67 67 Carbine 0.085 21 4 10 5 75 75 67 67 Centric 0.05 35 13 7 2 83 83 87 87 Treatments 8/10 and 8/18; planted 6/3

6 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 4 3 3 1 819 819 Centric 1.25 oz/A 2 5 1 0 933 933 Centric 2 oz/A 3 2 1 1 1023 1023 Diamond 4 oz/A 3 3 0 0 990 990 Diamond 6 oz/A 4 3 2 0 971 971 Diamond 9 oz/A 2 3 1 0 1060 1060 Carbine 2 oz/A 2 2 3 0 1086 1086 Orthene.33 lb/A 2 1 1 0 1048 1048 Numbers are for 100 sweeps. One application on 07/26

7 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 16 4 4 4 15 16 503 503 Diamond 9 oz/A 20 8 4 0 13 17 640 640 Diamond 6 oz/A + Bidrin 0.25 lb 12 4 0 0 13 18 641 641 Centric 2 oz/A 16 4 0 0 15 23 590 590 Orthene 0.5lb/A 8 0 4 0 12 10 595 595 Centric 1.25 oz +Diamond 4 oz 12 0 0 0 6 10 549 549 Centric 2 oz + Diamond 9 oz 16 4 4 4 16 14 590 590 Numbers are per 100 sweeps; applied treatments 8/2

8 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 0.025 ai 0 0 2 bsb 0 Spitfire 0.33 + 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

9 Armyworm Laboratory Ingestion Tests Treatments # Dead 48 hrs # Dead 72 Hrs # Dead 96 Hrs Baythroid 0.033 7 10 10 Diamond 9 oz 4 8 10 10 Exp # V 6 10 10 Exp # V2 5 10 10 Untreated 0 0 0 0 Ten 3 rd instar larvae introduced to green beans treated with each insecticide.

10 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

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