sign in sign up
<<
Home , Coumaphos, Nosema (microsporidian)

A survey of recent research findings regarding health. Pesticide/Pollinator Symposium Alfred, NY Maryann Frazier Senior Extension Associate, Penn State University North America Pollinators

National Academies of Science Status of Pollinators in North America 2007 Pollinators are in decline http://www.nap.edu/catalog/11761.html European Pollinators

 J. C. Biesmeijer, S. P. M. Roberts, M. Reemer, R. Ohlemler, M. Edwards, T. Peeters, A. P. Schaffers, S. G. Potts, R. Kleukers, C. D. Thomas, J. Settele, and W. E. Kunin

 21 July 2006 Science 313 (5785), 351.[DOI:10.1126/science.1127863]

 Parallel declines in pollinators and -pollinated plants in Britain and the Netherlands

www.sciencemag.org Honey Bee Colony Losses

 2007 = 31%  2008 = 35.8%  2009 = 29%  2010 = 33.8%

AIA and USDA/ARS [CDD] • Adult bee population suddenly gone or reduced to small cluster w/o dead bees –Over a few weeks, or a few days –In locations where bees are active (FL CA in winter)

Jeff Pettis/USDA

Jeff Pettis/USDA What have we learned?

Nosema disease

.New species? . .

.What Impact?

Nosema spores High level of pesticide exposure

Acephate Chlorothalonil Fenbuconazole Pendi methalin Fenhexamid sulfone Coumaphos Fenpropath rin Aldicarb sulfoxide Coumaphos -Chlorferone Fluva linate Pyraclostrobin Allethrin Coumaphos Heptac hlor Amicarbazone Hexachlorobenzene Pyrimethanil (2,4-DMA) Cyhalothr in (total) Im ida cloprid Quintozene (PCNB) Amitraz (2,4-DMPF) Cype rmethrin Im ida cloprid olefin Sethoxydim Atrazine Cyprodi nil Im ida cloprid, 5-hydroxy Simazine Azinophos-methyl Tebuconazole Azoxystrobin Bendi ocarb Tebuthiuron Difenoconazole Methoxyfeno zide Boscalid Methyl par athion Thiabendazole Captan Dimethomorph Metolachlor Diphenylamine Metribuzin Tribufos Carbary l (1-Naphthol) Endos ulfan 1 Myclobuta nil Trifloxystrobin Endos ulfan 2 Norflurazon Trifluralin , 3-hydroxy Endos ulfan sulfate Vinclozolin Carfentrazone Esfenval erate Oxyfluorfen Etoxazole p,p' -DDE

Multiresidue Pesticide Analysis on US Samples 2007-09 • Very few of 887 samples lacked detections

• Found 121 different pesticides and metabolites

, , ,

insect growth regulators, organochlorines, chlorinated cyclodienes,

20 fungicides, 12 herbicides, 2 acaricides, 1 synergist,

At least 14 of these are systemic pesticides

• On average 6.7 different pesticides per pollen sample -Up to 31 in a single pollen sample -Up to 39 in a single wax sample http://dx.plos.org/10.1371/journal.pone.0009754 http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0006481 • 61 variables (including adult bee physiology, pathogen loads, and pesticide levels) measured

• No one variable is likely to cause CCD

• CCD colonies had higher pathogen load

• Coumaphos levels were higher in control colonies

Study caveat - Snap shot in time WEIGHING RISK FACTORS ASSOCIA TED WITH BEE COLONY

COLLAPSE DISORDER BY CLASSIFICATION AND REGRESSION

TREE ANALYSIS

Dennis vanEngelsdorpa,b, Niko Speybroeckc,d, Jay Evanse, Bach Kim Nguyenf, Chris Mulli nb, Maryann Frazierb, Jim Frazierb, Diana Cox-Fosterb, Yanping Chene, David R. Tarpyg, Eric Haubruge f, Jeffrey S. Pettise, and Claude Saegermanh*

Journal of Economic Entomology • 55 variables analyzed (used to construct tree) • 6 of the 19 variables having the greatest discriminatory value were pesticide levels in different hive matrices. • coumaphos levels in brood had the highest discriminatory value and were highest in control colonies • fluctuating asymmetry; highest in CCD colonies In Summary

• High levels of disease in CCD colonies • “New” pathogens (IAPV, N. ceranae) • In general, high exposure to pesticides

• No one factor explains CCD; a combination of factors likely, perhaps not always the same combination QuickTime™ and a decompressor are needed to see thi s picture. The herbicide atrazine is linked to reproductive problems in frogs EPA commissioned study - no connection found

2008 Study Jason Rohr Univ. of S. Florida and others

Atrazine kills off floating mats of 1980’s worldwide decline algae, allowing algae on the in frog populations pond bottom to thrive Disease and habitat destruction are blamed Snails flourish; host

Flatworms parasitize frogs! Question: • Because bees and colonies are so sick - has the honey bee immune system been compromised? Factors that can impact immune function:

• Nutrition • Stress • Varroa S. Camazine • Pesticides Connections - pathogens and pesticides

• Sublethal effect of some pesticides - can impair the immune system function

– Higher levels of nosema in pesticide exposed bees - J. Pettis

– Bees exposed to pesticides - reduced immune system function - Cox-Foster, Mullin, Frazier J&M

????????????????? Increased viral titers following ingestion of fungicide and immune challenge in healthy bees BQCV titers affected by fungicide and

following woundingaverage and BQCV immune challenge

1.00E+05

1.00E+04

1.00E+03

1.00E+02

1.00E+01 Relative BQCV to Actin Expression Actin to BQCV Relative

1.00E+00

ecoli ecoli

saline saline saline

(control) (control) (control)

uninjected uninjected uninjected assailAcetamipridassail assail novaMyclobutaninova l nova sucroseSucrosesucrose Chemical Treatment/immune challenge (control) Alteration in immune gene expression by fungicide We Gratefully Acknowledge the Following Funding Sources • College of Agricultural Sciences • USDA Critical Issues • USDA CAPS • NAPPC • Jasper Wyman and Sons • Haagen Daz • National Honey Board