written by: Maria Cramer, PhD student, Hamby Lab and Veronica Yurchak, PhD student, Hooks Lab
Dr. Maggie Douglas, an assistant professor from Dickinson College, managed to stump most of a room full of entomologists when she asked them if pesticide use in United States agriculture was going up or down over time. There were a few embarrassed laughs, but Douglas reassured everyone; “It’s a complicated question. There’s disagreement in the scientific community.”
written by: Dylan Kutz, MS student, Lamp Lab
Whenever we see the words “genetically modified” in the news these days, they’re usually followed by two things: the word “crops” and a lot of controversy. Genetically modified crops or “GM” crops are crops that have had their DNA altered through genetic engineering to gain a desirable trait, such as pest suppression. While some fear the effects of genetically modified crops on human health, numerous studies have thoroughly debunked the myth that GM crops are dangerous to humans. Still, much remains unknown about whether insect-resistant GMO crops affect non-target insects after harvest, or even how they degrade after crops are harvested. Veronica Yurchak, a Ph.D. student working in the Hooks Lab at the University of Maryland’s Department of Entomology got to the bottom of these after-harvest mysteries in her master’s thesis.
Written by: Anna Noreuil, PhD student, Fritz Lab and Maggie Yuan, MS student, College of Edu
Shaded headwater streams are often overlooked by the average hiker, who may only fleetingly consider how they might leap across them to avoid wet feet. However, these streams are critical to aquatic and terrestrial ecological food webs and shouldn’t be simply ‘jumped’ over in terms of research. These food webs illustrate the connections and interactions that can exist between many different species in a natural community. In these illustrations, we can describe the transfer of ‘food energy’ in a system from one group of organisms to another. For example, plants and algae use energy from the sun to grow, which is eaten by herbivores, who will, in turn, be consumed by carnivores. When the sun provides the initial source of energy for the food web, it is said to be a green food web. In contrast, if the system receives little energy input from the sun, and is instead sustained by dead organic debris (utilized by decomposers), it is a brown food web. One common example of a brown food web here in Maryland is a shaded stream in a forest ecosystem.
Written by: Maggie Lewis, PhD Student, Hamby Lab and Tais Ribeiro, PhD student, Espindola Lab
Do you know the bitter taste of kale? Or the spicy flavor of mustard greens? These flavors are created by the plants often for defending against herbivory. These chemicals are non-essential to the plant’s growth, with diverse properties and classes, such as alkaloids and terpenoids. Herbivores might find the taste too bitter – and they have no salad dressing to mitigate that – and avoid to feed on it, being the plant protected against their attacks. These compounds could be even deadly! But, just like the bitter tea you drink when you have a stomach ache, they can also have positive and medicinal properties, including anti-fungal and anti-parasitic effects. Although secondary metabolites are synthesized throughout the plant, they exist at different concentrations in different tissues. They can even be present in nectar and pollen, which could affect pollinator visitation and behavior.
written by: Ted Striegel (MS student, Hawthorne lab) and Graham Stewart (MS student, Palmer lab)
Dr. Joe Russell is a senior scientist at MRIGlobal, a nonprofit contract research institute that conducts research on a wide array of topics (including chemical and biological surveillance, biosafety and security). The institute receives much of its funding from contracts with the U.S. Department of Energy and Department of Defense. Dr. Russell had a circuitous academic path to MRIGlobal, including time spent studying astrophysics and analysing marine sediment samples. His talk centered on a new technology developed by the institute - the Mercury Lab.
Written by: Huiyu Sheng (MS student, St. Leger Lab) & Zac Lamas (PhD student, vanEngelsdorp Lab)
Fungi are more than decomposers. They can infect many different organisms, including insects. It is due to the fact that fungi have the ability to infect insects that humans have a long history of using them for the biological control of pests. For instance, Beauveria bassiana was first identified as a silkworm pathogen in 1815. In 1879, Elie Metchnikoff, a Russian zoologist suggested using Metarhizium anisopliae to control beetles of agricultural crops.
Written by: Margaret Hartman (M.S. student, Lamp Lab) and Demian Nunez (M.S. student, Hooks Lab)
In recent years the public has become increasingly aware of the devastating impact humans are having on wildlife across the globe. Insect declines have received a lot of attention in the news lately with stories about the decline of pollinators inspiring people across the country to find ways to “save the bees,” including planting flowers in their yards, and some state and local governments are even taking steps to restrict or ban certain pesticides that are known to be harmful to pollinators. While honeybees (Apis mellifera) are among the most recognizable and charismatic of these pollinators, the real crisis is the even greater loss of native pollinator abundance and diversity across much of North America and other parts of the world. But pesticide usage isn’t the only factor contributing to the loss of our native bees and other insects. Diseases, parasites, and especially habitat loss have all contributed to native bee decline, and efforts to maintain and restore the health of our pollinator ecosystems will require a broad approach to making our expanding urban landscapes suitable for preserving our pollinator communities.
written by: Elizabeth Dabek, MS student, Hooks and Shrewsbury lab & Serhat Solmaz, MS student, vanEngelsdorp Lab
The Spotted-wing Drosophila (SWD) is an invasive pest native to Southeast Asia. Since it was first detected in 2008 in California, the fly has rapidly become widespread throughout North America. Unlike other common drosophila species breeding on rotting fruits, SWD female has a large and serrated ovipositor (Fig. 1) that enables it to lay eggs inside ripe and fresh fruits. As the fruit ripens, often after harvest, damage caused by SWD (dimples and craters on the skin of the fruit) becomes visible (Fig. 2). SWD is highly polyphagous; being able to oviposit and/or reproduce in various cultivated and wild fruits. Its fast development and high reproductive potential can lead to explosive population increases and significant economic losses to crops. Economic losses from SWD in the western US for raspberries, blackberries, blueberries, strawberries, and cherries are estimated to be up to $500 million annually1. Current control programs rely heavily on insecticides that target adult flies in commercial crops. Because non-crop habitats can act as a reservoir for the fly’s reinvasion into treated crops, area-wide IPM strategies such as biological control that reduce population densities at the landscape level need to be developed for such a highly mobile and polyphagous pest.
Written by: Arielle Arsenault-Benoit (PhD student, Fritz lab)
Dr. Deren Eaton, Assistant Professor at Columbia University, has broad interests in the evolution of plant morphology and diversification. In addition to his field and laboratory research, Dr. Eaton has a developed ipyrad, a software platform and toolkit to aid scientists in the analysis of genomic data in an effort to make analysis of genomic datasets more accessible and reproducible. The era of sequencing and genomic analysis is changing the way we think about ecology and evolution. By generating large datasets that span the genome, researchers can explore changes in lineages over space and time, and witness evidence of gene flow between populations, historical genetic mixing, or isolation events using statistical modeling approaches.
Written by: Lindsay Barranco and Krisztina Christmon
Sam Droege is a wildlife biologist at USGS Patuxent Wildlife Research Center in Laurel, Maryland, where he runs the Native Bee Lab and conducts research that focuses on wild bee population conservation and management. Researchers far and wide send Sam bee specimens for identification and his work involves maintaining an inventory and monitoring program for native bees, and providing an online identification guide for North American bees at www.discoverlife.org .
Since the dawn of agriculture thousands of years ago, humans have altered the global landscape. Humans transported crop species and plants across the world for feed and harvest. Agriculture allowed for modern civilization to progress, ultimately resulting in the construction of cities, urban and suburban areas. As humans move further and further away from natural landscapes, it comes at a significant cost to communities of various organisms. With these human-induced changes in mind, Dr. Kim (La Pierre) Komatsu (Fig. 1) of the Smithsonian Environment Research Center studies plant communities and connections to ecosystem processes. Dr. Kim investigates interactions between plant communities and plant biomass accumulation, insect herbivores, and nutrient acquisition, always considering how global change affects such interactions.
Written by: Maggie Hartman, Zac Lamas, Arielle Arsenault-Benoit
If you have been to the coastal tropics or subtropics, you may have seen lush trees, with almost science fiction-like root systems. These are trees in the genus Rhizophora, colloquially known as the mangroves. Mangrove forest ecosystems are coastal and found between 30° N and 30° S. They are a flowering angiosperm, with a hydrochorous propagule dispersal mechanism (dispersal occurs via water). The propagules are seedlings, formed by the embryo growing through the seed coat and fruit wall, while still attached on the mother tree, a phenomenon known as vivipary.. These propagules depend on the ocean surface current to disperse both close by and remotely; they are capable of floating in ocean currents for up to three months or more. Alternatively, mangrove gene dispersal can occur via pollen transfer by wind or insects. Ideally, these propagules are distributed to new environments where they can sprout, and mature into an adult tree. If the new tree is capable of maturing and reproducing in a new area, we would cite this as an example of gene flow. If you’re having a hard time imagining this, just think of the cosmopolitan coconut. Although technically the coconut is a drupe and not a propagule, their distribution in ocean currents is synonymous. Unfortunately for our hopeful mangroves, their propagules have to overcome barriers that restrict their distribution.
Written by: Elizabeth Brandt, Mintong Nan, Anna Noreuil, Katie Reding
How it is possible to maintain a segmented body plan after loss of a key developmental gene? Dr. Alys Jarvela, a biochemist, geneticist, and postdoctoral scholar in the Pick Lab at University of Maryland, presented her research to address this precise question.
Written by: Katie Reding, Serhat Solmaz, and Arielle Arsenault-Benoit
Adaptation to abiotic stressors and environmental change is imperative to survival in a rapidly changing world. Dr. Reid Brennan, an ecological geneticist and postdoctoral scholar in the Pespeni Lab at University of Vermont, presented his research in aquatic systems to explore the genomic basis of populations’ responses to these stressors over short- and long- time periods.
Written by: Darsy Smith & Lindsay Barranco
Destruction by crop insects requires strategies to combat pests below ground and above ground. Dr. Hiltpold’s novel approach uses nature to do this work.
Written by: Dylan Kutz & Serhat Solmaz
Our ecosystems are under siege by plants hailing from exotic realms. Can one of nature’s most ubiquitous insects be the key to saving protecting our native locales from invasion?
Written by: Jonathan Wang & Mike Nan
It’s no secret that the road to academia is tough. Faced with a “publish or perish” atmosphere and stagnant or declining rates of scientific funding, the academic route for a graduate student is daunting. A recent study suggests graduate students are six times more likely to experience depression and anxiety compared to the general population. Part of the problem is how hard it is to navigate a way into a tenure-track position. Thankfully, the problem is being recognized and a number of high-profile failure CVs have made waves online. Dr. Kimberly Wallin has her own advice to graduate students and reveals exactly “how the heck” she got here.
Written by: Veronica Yurchak & Anthony Nearman
Managing a crop pest means more than simply spraying fields with insecticides. What and when to spray, how much, and where to apply chemicals are all questions that any successful pest control must address. To further complicate things, the answers to those questions will change with any given pest. How then do we confront the vast number of pests plaguing our agricultural systems? Dr. Jim Miller believes he has an answer, and it begins with sex.
Written by: Zac Lamas and Graham Stewart
If you are traveling in New England and have ever passed an open meadow that isn’t being used for agriculture, you’re probably looking at an “old field” ecosystem. These are dense fields filled with a variety of flora- typically dominated by the early summer legumes trefoil and trillium, followed by the late season goldenrods and asters. While these fields are often overgrown, occasional mowing or controlled burning prevents succession to a forested state.
These old field ecosystems provide rich models for studying nutrient cycling. Rob Buchkowski, a PhD candidate from Yale, has spent his dissertation investigating “brown” (traditionally thought of as belowground) and “green” (traditionally thought of as aboveground) food webs, and how nutrition flows through and between these components of old field ecosystems. If you’re up for a bit of a ride, we’ll follow Rob through a bird’s eye view of the major principles of food chains, how nutrition moves through the system, and how we can mathematically model these systems
Hormone physiology and bacterial symbionts: Integrative approach to increasing understanding of vector development and reproduction
Written by: Arielle Arsenault-Benoit & Katie Reding
Vector development and reproduction are imperative to combating vector-borne illness. Dr. Kevin Vogel and his research team at the University of Georgia are employing an integrative approach to further understanding of these factors in mosquitoes and a triatomine kissing bug.
Written by: Maggie Lewis. Maggie is a second year PhD student in the Hamby lab who is currently studying the interactions between spotted wing drosophila and yeast and fungal microbes.
In agriculture, understanding an insect’s biology is a crucial aspect for developing and improving sustainable agricultural pest management programs. Knowledge of basic aspects of an insect’s life history, including its phenology, its behavioral ecology, and its interactions with the environment, provide clues that can help growers identify and exploit that pest’s weakness. Dr. Anne Nielsen, an associate professor in the Department of Entomology at Rutgers University, is currently studying how we can use this biologically based approach to improve management of Halyomorpha halys, more commonly known as the brown marmorated stink bug (BMSB).
Written by: Lisa Kuder, PhD student, vanEngelsdorp Lab & Kelly Kulhanek, PhD student, vanEngelsdorp Lab
Swarming, biting insects that shroud their victims in a seemingly inescapable cloud can certainly put a damper on outdoor activities. This is a common scenario in parts of the Mid-Atlantic Region situated near fast-moving rivers like the Potomac. In 2013, the public and economic impacts of biting insects moved residents from Washington County, Maryland to seek help from their state delegate and from UMD’s aquatic insect lab. The main culprit that locals tend to call “gnats” turned out to be black flies, Simulium jenningsi (Order: Diptera). In response to complaints about the nuisance fly, Becca Wilson-Ounekeo, a PhD candidate in UMD’s Entomology Department, set out to learn more about the biology, distribution, and public impact of the black fly. She soon embarked on research that would incorporate citizen-science and intensive field work.
Written by Elizabeth Brandt. Elizabeth Brandt is a M.S. student in Dr. David Hawthorne’s lab studying the detoxification gene pathways of the honey bee.
On an extremely wet Saturday in Annapolis, the UMD Entomology department gathered at the downtown offices of SESYNC for their annual Department Retreat. The retreat is designed for all members of the department to come together at the beginning of a new academic year to discuss the past year’s developments and accomplishments, and to synthesize a strategic plan for the coming year. Part of the retreat’s agenda includes a series of short research talks given by graduate students, postdocs, and faculty. For the 2018 retreat, the department welcomed two new faculty members, Dr. Karin Burghardt and Dr. Anahí Espíndola. Each gave a short talk about their research interests.
The gall wasp tree of life is overdue for a major overhaul. With the help of new genetic technologies and the hard work of Crystal Cooke (Dept. Entomology, University of Maryland), we have a better understanding of the relationships between gall wasp species and clades.