Applications accepted for study abroad program in Galapagos Islands

April 28, 2011 under CANR News

A once-in-a lifetime academic adventure is in store for students participating in the January, 2012, study-abroad program in the Galápagos Islands and Ecuador. Applications are being accepted until June 30.

The program, set for Jan. 3-25, 2012, will be led by Thomas Evans, professor of plant and soil sciences, and Rebekah Helton, research associate with the Delaware Biotechnology Institute Bio-Imaging Center and the Center for Translational Cancer Research Core Facility.

“This three-week academic journey will offer students the opportunity to walk in the footsteps of Charles Darwin and study evolution and endemism in one of the most unique places on the planet,” Helton said.

For the first 12 days in the Galápagos Islands, students will live and learn aboard the 131-foot motor yacht Coral I, owned and operated by Kleintours. Evans and Helton will lead field trips on land each morning and afternoon, moving through the Galápagos Archipelago, hiking on the trails of each island and studying the plants, animals and ecosystems.

In the Andean region of Ecuador, the group will study the ecology of the highlands at Cotopaxi National Park, following the path of Alexander von Humboldt, the German naturalist who in the early 1800s traveled the mountainous region studying its natural history and volcanoes while mapping the equator.

All students will take two courses during the program — “Plants of Ecuador” (PLSC340) and “Tropical Ecology” (PLSC367) — and will work together learning about Ecuador’s diversity of plants, native species of plants, local use and applications. Students will learn field techniques for observation or actual hands-on study in Cotopaxi National Park, as well as in the Galápagos Islands.

“On this trip, students will gain a perspective on preservation of unique and fragile ecosystems in a developing country,” Evans said. “Students will learn about tropical ecology at the extremes, on islands in the middle of the Pacific Ocean and on volcanic peaks at elevations between 12,000 and 15,000 feet. And through cultural events, they will learn about the people of this wonderful country.”

All majors are accepted for the program, which is offered by the College of Agriculture and Natural Resources. Students from animal science, plant science, exercise science, environmental sciences and entomology have been accepted into the program so far. A blog will showcase student activities and adventures when the program is under way.

Evans, a botanist and plant pathologist, has been working in Ecuador since 1989, and launched UD’s first study abroad program in South America when he took a group to Ecuador and the Galápagos Islands in 1998. Since then, Evans has led or co-led nine study-abroad trips to these locations.

Helton is a microbial ecologist and previously worked in Ecuador in 2005 studying the microbial ecology and diversity of the benthic environment. She has experience conducting research in marine environments, from the Chesapeake and Delaware Bays aboard UD’s research vessel, to the depths of the Pacific Ocean exploring hydrothermal vents in the submersible Alvin.

See the website for grade point average requirements, program costs and application guidelines. For more information, contact Thomas Evans at, 831-1066, or Rebekah Helton at, 831-6100.

For full article and more photos, visit UDaily


CANR researchers team up to combat lima bean disease

February 3, 2011 under CANR News, Cooperative Extension

When battling downy mildew, a potentially devastating disease that strikes lima beans (Phaseolus lunatus), one of Delaware’s most important vegetable crops, assembling a team of experts to attack the problem from all angles is a must. That’s why a diverse group of plant scientists in the University of Delaware’s College of Agriculture and Natural Resources has joined together to battle this important plant disease.

Tom Evans, professor of plant pathology in the Department of Plant and Soil Sciences, and many graduate students have studied downy mildew over the past 15 years.

Evans said lima beans are vital to agriculture in Delaware and are “the cornerstone of the state’s processing vegetable industry.” Approximately 6,000 hectares of baby lima beans are grown annually, with a farm value of over $6 million. If lima bean cannot be grown profitably in the state, then many other processing vegetables would not be grown due to the economics of processing.

Downy mildew, caused by the fungus-like organism Phytophthora phaseoli, is prevalent in Delaware because it thrives in humid conditions, and lima beans are grown on small, dense acreage. Evans said that most lima bean growers are concentrated in close proximity from Dover to Georgetown and from the Delaware Bay west into Maryland, so wind-driven rain makes it easier for the pathogen’s sporangia to move from one lima bean field to another.

That was the case in 2000, when downy mildew caused $3 million damage in what Evans called “the largest downy mildew of lima bean epidemic ever recorded.” Two factors contributing to this epidemic were the emergence of a new race of the pathogen, Race F, which overcame the genetic resistance of lima cultivars being grown, and frequent wind-driven rain that spread the pathogen’s sporangia.

With the emergence of Race F, growers could no longer rely on downy mildew resistant lima bean cultivars to prevent the disease, as they had in the past. New cultivars with resistance to Race F need to be developed and in the meantime growers have relied upon fungicides to manage the disease.

Bob Mulrooney, extension specialist in plant pathology, has tested fungicides for effectiveness against downy mildew for a number of years and has identified new more environmentally-friendly chemicals which offer good control. Mulrooney’s research results are the basis for growers’ current downy mildew management practices.

Evans and his group have been responsible for studying the biology of the pathogen, monitoring the evolution of new races of the pathogen and the epidemiology of the disease.

Extension associate Nancy Gregory diagnoses the disease on samples sent in by growers, maintains the pathogen in culture for field and greenhouse experiments, and determines their races.

Emmalea Ernest, an extension associate at the Carvel Research and Education Center in Georgetown, Del., breeds lima bean for desirable traits, such as disease and drought resistance, and is developing cultivars for Delaware farmers. Ernest and Evans work together screening lima bean germplasm from around the world for resistance to races E and F of P. phaseoli. Ernest has conducted experiments to determine how the resistance genes are inherited. After making crosses between resistant parents followed by several years of field screening, Evans and Ernest are testing lima bean lines with resistance to both races this summer.

Nicole Donofrio, assistant professor of plant and soil sciences, is responsible for the pathogen side of the study, trying to understand the pathogen’s virulence mechanisms, and how it evolves to attack certain aspects of the plant. Donofrio said, “In order to fight the disease, you have to know your enemy, and the more you know your enemy, the more equipped you are to tackle it when things like a new race emerge.”

Knowing exactly how to fight against the disease from a pathogen standpoint is difficult. Donofrio points out that P. phaseoli has over 500 effector genes, molecules that bind to a protein altering its activity and enabling infection. To study effectors, Donofrio and doctoral student Sridhara Kunjeti took a two-pronged approach. First, they took what they knew about P. infestans, the pathogen responsible for the Irish potato famine and a close relative of P. phaseoli, and searched for similar genes in P. phaseoli to determine if it used similar mechanisms in its attack on lima bean.

Next, they looked at lima beans that had been infected for three and six days to see which effectors were active during those time-points of infection. Donofrio said this could lead to a breakthrough because if they are able to characterize the effector genes, they can look for traits that could be a countermeasure to pathogen attack and thereby block pathogenesis.

Randy Wisser, assistant professor of plant and soil sciences, works on aspects of quantitative genetics and plant breeding and Blake Meyers, Edward F. and Elizabeth Goodman Rosenberg Professor and chair of the Department of Plant and Soil Sciences, works on genomics of lima bean-downy mildew interactions.

In various combinations, the research team has received over $200,000 from various CANR seed grants and Delaware state grants to more fully explore P. phaseoli and downy mildew.

Article by Adam Thomas

This article can also be viewed online on UDaily by clicking here.