J. H. Temple, P. L. Bommireddy, P.Marcon, S. Micinski, & B. R. Leonard

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Presentation transcript:

J. H. Temple, P. L. Bommireddy, P.Marcon, S. Micinski, & B. R. Leonard Rynaxypyr™ (DPX-E2Y45) & Cypermethrin: Susceptibility of a Selected Lepidopteran Cotton Pest J. H. Temple, P. L. Bommireddy, P.Marcon, S. Micinski, & B. R. Leonard

Bollworm Sampling Sites Collection sites (2005-2007)

Trends in Midwest: Pyrethroid Efficacy in CEW Declines: % Larval Control in Sweet Corn (Capture/Warrior; WI, MN) Year Mean 1997 93 1998 88 1999 81 2000 49 2001 17 2002 41 2003 40 2004 69 2005 2006 2007 61 35 Looks like the % larval control is going down over time. From later slides, mostly adults are being tested for resistance to pyrethroids. I thought there was not necessarily a link between adult resistance and larval resistance, is that not accurate? Not always a good link; That is why I also included slides for Direct Larval Assays (cypermethrin and Warrior, which are showing resistance too). (as per slide 9) Hutchison et al. Univ. of Minn.

Objective Evaluate Bollworm Susceptibility to: 1. Cypermethrin 2. Rynaxypyr (DPX-E2Y45)

Adult Vial Test 5 & 10 μg/vial Cypermethrin

Collection Sites Across LA Cotton Acreage Sampling Sites

Historical Bollworm Survival (AVT) May-Sept 1988 to 2006 May-Sep 2007* Cypermethrin 5 µg/vial % Survival Louisiana * 8 collection sites, 1000 moths tested

Annual Bollworm Survival (5 µg/vial) Cypermethrin Percent Survival

Annual Bollworm Survival (10 µg/vial) Cypermethrin Percent Survival 0%

Average Bollworm Survival (AVT) 2005-2007 Late Season Field Collections Cypermethrin 5 µg/vial Percent Survival

TOPICAL APPLICATION

Louisiana Bollworm Topical Results Colony N LC501 95%CL Slope RR Winnsboro-04 160 6.12 4.92-7.76 2.92±0.37 7-22 Winnsboro-05 115 3.48 0.03-0.05 3.15±0.41 4-12 LSU Lab-06 240 0.20 0.04-0.06 2.56±0.36 NA Winnsboro-06 220 3.50 2.69±0.34 Winnsboro-07 190 2.80 0.07-0.12 2.23±0.28 3-10 DuPont Lab-07 0.21 0.05-0.07 2.83±0.41 Resistance Ratios (RR) calculated from LD50 data (0.28 to 0.88 µg/g larval weight) derived from Louisiana lab and field collections 1998 (Unpublished Data, J. Adamcyck and J. Gore LSU Dept. of Entomology). 1µg/g larval weight.

Summary Pyrethroid Monitoring LA BW susceptibility to pyrethroids continues to decline. Widespread concerns (Midwest, TX, Southeast) Continue monitoring program during 2008. Alternative control strategies: Transgenics and Alternative Insecticides (Rynaxypyr)

Coragen™ SC & Altacor™ WG Rynaxypyr™ (DPX-E2Y45) Coragen™ SC & Altacor™ WG Novel insecticide chemistry Class: Anthranilic diamides MOA: Muscle Functions Calcium Channels High toxicity to Lepidoptera at very low rates, long residual Feeding cessation, lethargy, paralysis, and death

Bollworm Colonies Rynaxypyr LSU Lab DuPont Lab Georgia Field North Carolina Field Virginia Field Delaware Field Louisiana Field

Diet Incorporation Methods Formulated Rynaxypyr (35 WG) dissolved in distilled water to create stock solution 100 µg/ml Nine serial dilutions created 0.01-1 µg/ml diet 3rd instar larvae placed on range of treated diet doses Mortality rated at 24, 48, 72, 96 HAE Mortality analyzed using Polo-Plus Probit Analysis to create LC 50’s

Diet Incorporation of Rynaxypyr LSU Lab Bollworm Percent Mortality 0.069 LC50 Range ( 0.062-0.086) Dose (µg/ml of diet)

Bollworm Diet Incorporation Results Colony N LC501 95%CL Slope Χ2 LSU Lab 280 0.07 0.05-0.10 2.85±0.31 11.82 Georgia 240 0.04 0.03-0.05 3.15±0.41 1.80 North Carolina 180 0.05 0.04-0.06 2.56±0.36 3.43 Virginia 2.69±0.34 2.90 Delaware 210 0.09 0.07-0.12 2.23±0.28 4.27 Louisiana 0.06 0.05-0.07 2.83±0.41 3.12 DuPont Lab 2.78±0.35 2.69 1µg/ml diet

Lab and Field Bollworm Survival (AVT) Cypermethrin 5 µg/vial Percent Survival 0%

Lab and Field Bollworm Survival (Diet) Cypermethrin 5 µg/vial Percent Survival LC50 values to Rynaxypyr (Diet incorporation) 0.069 0.061 0%

Rynaxypyr Summary Toxic at relatively low doses Activity: Contact and Ingestion All Bollworm colonies had similar LC50’s (5-states, 2-Lab colonies) No Cross-resistance to pyrethroids observed

Acknowledgments Sandy Stewart, Brandi Woolam, Karla Emfinger, Trey Price, Sierra Jones, Sara Lowe, Nick Cannady, Josh Russell, and numerous other student workers at the Macon Ridge Research Station. Bollworm collections: Kathleen Heldreth, Glenn Hammes, Tom Kuhar, John Van Duyn, Bob Williams, Chris Williams, Joe Saienni, and Greg Hannig.