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Dive into the research topics where Abby Seaman is active.

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Featured researches published by Abby Seaman.


Evolution | 2009

COMPONENTS OF REPRODUCTIVE ISOLATION BETWEEN NORTH AMERICAN PHEROMONE STRAINS OF THE EUROPEAN CORN BORER

Erik B. Dopman; Paul S. Robbins; Abby Seaman

Of 12 potential reproductive isolating barriers between closely related Z‐ and E‐pheromone strains of the European corn borer moth (Ostrinia nubilalis), seven significantly reduced gene flow but none were complete, suggesting that speciation in this lineage is a gradual process in which multiple barriers of intermediate strength accumulate. Estimation of the cumulative effect of all barriers resulted in nearly complete isolation (>99%), but geographic variation in seasonal isolation allowed as much as ∼10% gene flow. With the strongest barriers arising from mate‐selection behavior or ecologically relevant traits, sexual and natural selection are the most likely evolutionary processes driving population divergence. A recent multilocus genealogical study corroborates the roles of selection and gene flow ( Dopman et al. 2005 ), because introgression is supported at all loci besides Tpi, a sex‐linked gene. Tpi reveals strains as exclusive groups, possesses signatures of selection, and is tightly linked to a QTL that contributes to seasonal isolation. With more than 98% of total cumulative isolation consisting of prezygotic barriers, Z and E strains of ECB join a growing list of taxa in which species boundaries are primarily maintained by the prevention of hybridization, possibly because premating barriers evolve during early stages of population divergence.


Plant Disease | 2013

The 2009 late blight pandemic in the eastern United States - causes and results

William E. Fry; Margaret T. McGrath; Abby Seaman; Thomas A. Zitter; Adéle McLeod; Giovanna Danies; Ian Small; Kevin Myers; Kathryne L. Everts; A. J. Gevens; Beth K. Gugino; S. B. Johnson; Howard S. Judelson; Jean Beagle Ristaino; Pamela D. Roberts; Gary A. Secor; K. Seebold; K. Snover-Clift; A. Wyenandt; Niklaus J. Grünwald; Christine D. Smart

The tomato late blight pandemic of 2009 made late blight into a household term in much of the eastern United States. Many home gardeners and many organic producers lost most if not all of their tomato crop, and their experiences were reported in the mainstream press. Some CSAs (Community Supported Agriculture) could not provide tomatoes to their members. In response, many questions emerged: How did it happen? What was unusual about this event compared to previous late blight epidemics? What is the current situation in 2012 and what can be done? Its easiest to answer these questions, and to understand the recent epidemics of late blight, if one knows a bit of the history of the disease and the biology of the causal agent, Phytophthora infestans.


PLOS ONE | 2014

An ephemeral sexual population of Phytophthora infestans in the Northeastern United States and Canada.

Giovanna Danies; Kevin Myers; María Fernanda Mideros; Silvia Restrepo; Frank N. Martin; D. E. L. Cooke; Christine D. Smart; Jean Beagle Ristaino; Abby Seaman; Beth K. Gugino; Niklaus J. Grünwald; William E. Fry

Phytophthora infestans, the causal agent of late blight disease, has been reported in North America since the mid-nineteenth century. In the United States the lack of or very limited sexual reproduction has resulted in largely clonal populations of P. infestans. In 2010 and 2011, but not in 2012 or 2013, 20 rare and diverse genotypes of P. infestans were detected in a region that centered around central New York State. The ratio of A1 to A2 mating types among these genotypes was close to the 50∶50 ratio expected for sexual recombination. These genotypes were diverse at the glucose-6-phosphate isomerase locus, differed in their microsatellite profiles, showed different banding patterns in a restriction fragment length polymorphism assay using a moderately repetitive and highly polymorphic probe (RG57), were polymorphic for four different nuclear genes and differed in their sensitivity to the systemic fungicide mefenoxam. The null hypothesis of linkage equilibrium was not rejected, which suggests the population could be sexual. These new genotypes were monomorphic in their mitochondrial haplotype that was the same as US-22. Through parentage exclusion testing using microsatellite data and sequences of four nuclear genes, recent dominant lineages US-8, US-11, US-23, and US-24 were excluded as possible parents for these genotypes. Further analyses indicated that US-22 could not be eliminated as a possible parent for 14 of the 20 genotypes. We conclude that US-22 could be a parent of some, but not all, of the new genotypes found in 2010 and 2011. There were at least two other parents for this population and the genotypic characteristics of the other parents were identified.


Arthropod Management Tests | 2015

Squash Bug and Striped Cucumber Beetle Control with Insecticides Allowed for Organic Production, 2014

Abby Seaman; Holly Lange; Anthony M. Shelton

This trial was conducted to evaluate insecticides allowed for use in organic production. The trial was conducted on a field at Cornell’s New York State Experiment Station in Geneva, NY managed using practices allowed for organic production since 2008. Zucchini “Tigress” was seeded in the greenhouse 29 May and transplanted on 16 Jun into raised beds with 1.25 mil black polyethylene and drip irrigation tape. A solution of 0.5 oz/gal Fertrell fish oil emulsion was applied to all plants at transplanting. Annual ryegrass was seeded between the rows for weed control and mowed periodically as needed. Six treatments and an untreated check were arranged in a RCB design with four replications. Each plot consisted of six plants spaced 18 inch …


Mitigation and Adaptation Strategies for Global Change | 2008

Projected change in climate thresholds in the Northeastern U.S.: implications for crops, pests, livestock, and farmers

David W. Wolfe; Lewis H. Ziska; Curt Petzoldt; Abby Seaman; Larry Chase; Katharine Hayhoe


Arthropod Management Tests | 2015

Swede Midge, Diamondback Moth, and Imported Cabbageworm Control With Insecticides Allowed for Organic Production, 2014

Abby Seaman; Holly Lange; Anthony M. Shelton


Arthropod Management Tests | 2013

SWEDE MIDGE CONTROL WITH INSECTICIDES ALLOWED FOR ORGANIC PRODUCTION, 2012

Abby Seaman; Holly Lange; Anthony M. Shelton


Archive | 2008

Using Trichogramma ostriniae to help manage European corn borer in sweet corn, peppers, and potatoes

Abby Seaman; Michael P. Hoffmann; Mary M. Woodsen


Arthropod Management Tests | 2018

Laboratory Bioassay Evaluation of Insecticides Allowed for Organic Production Against Striped Cucumber Beetle, 2015

Jeffrey Gardner; Abby Seaman; Michael P. Hoffmann


Arthropod Management Tests | 2017

Evaluation of Insecticides Allowed for Organic Production Against Crucifer Flea Beetle, 2016

Abby Seaman; Holly Lange

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Beth K. Gugino

Pennsylvania State University

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