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Examining the Role of Aphid Dynamics in Pumpkin Virus Infections Gina Angelella Dr. Jeffrey D. Holland Dr. Ian Kaplan Entomology Department Purdue University.

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Presentation on theme: "Examining the Role of Aphid Dynamics in Pumpkin Virus Infections Gina Angelella Dr. Jeffrey D. Holland Dr. Ian Kaplan Entomology Department Purdue University."— Presentation transcript:

1 Examining the Role of Aphid Dynamics in Pumpkin Virus Infections Gina Angelella Dr. Jeffrey D. Holland Dr. Ian Kaplan Entomology Department Purdue University

2 ipm.illinois.edu Aphid-Vectored Viruses Cucumber mosaic virus (CMV)Papaya ringspot virus (PRSV) Watermelon mosaic virus (WMV)Zucchini yellow mosaic virus (ZYMV)

3

4 4 yrs aphid sampling in adjacent prairie vs. row crop habitats Favret & Voegtlin. 2001. Migratory aphid (Hemiptera: Aphididae) habitat selection in agricultural & adjacent natural habitats. Env Entomol 30(2):371-379 167 aphids captured 15m 1,442 aphids captured

5 Observations in 2010 Large differences in weed management practices  relationship with aphid alightment rates?

6 Variations in Surrounding Landscapes

7 1) How does within-field weed cover affect aphid alightment on a local scale? 2) How do large-scale landscape features affect aphid alightment? Questions 3) How do the above factors influence the occurrence of virus infection(s) in fields?

8 Measure of Aphid Alightment  Weekly Alate Counts

9 20102011 Pumpkin Field Locations

10 2010 Noncolonizing Aphids

11 Weed Cover Analysis 2011 Weed Cover/m 2

12 CoefficientsEstimateSEz valuePr(>|z|) (Intercept)2.2100.15114.604<0.05 Weed Cover/m 2 3.8320.6845.607<0.05 2011 Mid-Season

13 2011 Late Season CoefficientsEstimateSEz valuePr(>|z|) (Intercept)3.5650.11132.023<0.05 Weed Cover/m 2 -1.8390.359-5.125<0.05

14 Large differences in between-row weed cover per site from mid- to late season Mid-SeasonLate Season

15 Landscape Analysis Radii 1-5 km

16 Nearby source populations? Aphid species regressions with host crops w/in 1-5 km radii

17 2011, 1km2010, 2 km 2011, 1 km Spotted Alfalfa Aphid Cowpea Aphid

18 2010, 1 km Bird cherry-oat aphid Corn leaf aphid

19 Both Large- and Local-Scale Factors Associated with Aphid Alightment Weed cover negatively correlated with aphid alightment, with some cover/m 2 threshold likely Some evidence for surrounding crops acting as source pools, especially within 1-2 km  How do aphid community assemblages vary in response to landscape compositions?

20 Next Steps to Address Question 3: How does local- and landscape-level variation among fields influence virus infection(s) occurrence? Develop m-RT-PCR assay to detect CMV, WMV, PRSV, ZYMV in tissue samples Assay pumpkin & weed leaf samples collected from 2010 & 2011 Analyze relationship of virus presence/absence by field with weed cover, surrounding landscape composition & weed species composition

21 Acknowledgements Dr. Ian Kaplan, Dr. Jeffrey Holland, Dr. Joseph Anderson, Dr. Christian Krupke Dr. Dan Egel, Sarah Hoke, Shannon Pearce, Gareth Powell, Caryn Michel Carmen Blubaugh, Joseph Braasch, Ulianova Vidal-Gomez, Jessica Kelly, Elizabeth Rowan, Michael Garvey Coulter's Produce, Etienne's Farm, Garwood Orchards, Kents Cucurbits, Pearson's Melon Farm, Prairie View Farm, Mouzin Brothers Farm, the McCormicks, Beasley’s Orchard, Matthews Tree Farm and Pumpkin Patch, Steve Nowaskie, Todd Zeigner, the Tragessers, Guse Christmas Trees, Tuttle Orchards, Hog Wallow Farm, Skiles Orchard, Stony Creek Orchards, LarryLand IVGA

22 CoefficientsEstimateSEz valuePr(>|z|) Corn-0.002680.0003-10.367<2e-16 Soy0.000410.00022.6530.007987 Forest-0.003500.0004-8.1154.86e-16 Alfalfa-0.036400.0080-4.5435.54e-06 Dev Open Lnd-0.003490.0006-5.7548.72e-09 Woody Wetl.0.168560.02217.6332.30e-14 Herb Wetl.0.195980.05433.6080.000308 CoefficientsEstimateSEz valuePr(>|z|) Corn0.001890.00053.6470.000265 Soy0.001670.00062.8200.004803 Forest0.001430.00052.7000.006931 Pasture0.001770.00072.5610.010434 Developed0.002820.00083.7050.000211 Woody Wetl.0.029880.00329.255<2e-16 Herb Wetl.-0.040340.0480-0.8400.400914 2011 2010 AIC=38.843 AIC=84.215

23 Weed Sample Composition 2010 2011

24 C = Cucumber mosaic virus Z = Zucchini mosaic virus W = Watermelon mosaic virus P = Papaya ringspot virus Weeds Susceptible to Virus Infections

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