2 LSU Researchers Get Nearly $1M to Study Honeybee Stress

U.S. News     June 25, 2017

BATON ROUGE, La. (AP) — Two Louisiana State University researchers are getting nearly $1 million for a two-year study of how mite treatment and stress affect honeybee health.

Kristen Healy and Daniel Swale are working with U.S. Department of Agriculture researchers in Baton Rouge and the nation's largest beekeeper, the LSU AgCenter said in a news release Thursday.

They'll be studying 400 hives of honeybees owned by Adee Honey Farms of Bruce, South Dakota, including some that are moved to California for the fall almond harvest and then to Mississippi for the winter.

Healy said they will sample pollen, nectar and bees from hives during and at the end of the study.

"We can look at which colonies failed and which ones didn't and quantify which stress variables were more important to the relative health of the bees," Healy said.

LSU is getting $935,000. It's among seven universities getting a total of $6.8 million from the USDA to study pollinators.

Healy will see how bees treated with a mite control product compare to untreated bees.

Swale will study whether the moves make them spend more energy, reducing their fat storage — and if there's a way to boost those fats.

The researchers also are interested how a virus that causes deformed wings is spread.

The grant also includes an extension component so the researchers can determine the best methods to get bee health information to beekeepers and the public.

The USDA estimates honeybees pollinate $15 billion worth of crops.


Can Stress Management Help Save Honey Bees?

         November 24, 2014


Honey bees foraging on sunflower. Honey bee populations are clearly under stress--from the parasitic Varroa mite, insecticides, and a host of other factors--but it's been difficult to pinpoint any one of them as the root cause of devastating and unprecedented losses in honey bee hives. Researchers writing in the Cell Press journal Trends in Parasitology on November 24th say that the problem likely stems from a complex and poorly understood interplay of stresses and their impact on bee immunity and health. It's a situation they suspect might be improved through stress management and better honey bee nutrition.

As the bees have grown weaker with stress, they are left susceptible to diseases that the beneficial insects can normally carry without issue. That's especially problematic given that honey bees live together in such close quarters.

Honey bees live in complex societies, characterized by densely packed populations, and have evolved unique mechanisms for interacting with pathogens, explained Francesco Nazzi and Francesco Pennacchio of the Italian universities of Udine and Napoli, respectively. Some pathogens, such as the deformed wing virus, can cause asymptomatic infections that are normally kept under control by the immune system.

"These covert infections are very common all over the world and represent a kind of Damocle's sword for honey bee colonies," Nazzi said. "When bees are exposed to stress agents, which may adversely affect the immune competence, a sudden health decay can occur due to uncontrolled pathogen proliferation."

The first records of mysterious deaths of honey bee colonies were reported in the United States in 2006, followed shortly by similar reports in other countries. Systematic monitoring in Europe and the United States has shown that losses in the range of 20 to 30 percent of hives are common, and, in some places, the situation has been much worse.

The Varroa mite certainly doesn't help matters, as it sucks hemolymph (the equivalent of blood) from the insects' bodies, debilitating the bees and facilitating viral transmission. Neurotoxic insecticides like neonicotinoids, at sublethal doses, may also impair the bees' immune response and contribute to colony decline and eventual losses.

"But," Nazzi and Pennacchio say, "their importance depends on the health conditions of exposed bee populations and cannot be considered the sole factor responsible for colony losses. Looking at bee colony losses from this perspective may allow us to partly explain the multifactorial origin of this multifaceted event."

They call for more basic science to produce sound knowledge of the underlying immune responses and the molecular mechanisms that drive them. Those should be followed by tests under natural, field conditions, along with efforts to select for natural bee populations that are more resistant to those stresses. New schemes of "Integrated Stress Management" are also needed.

Honey bees might be fortified not only by helping to manage their obvious stresses--by keeping parasites in check, for example--but also by paying more attention to their diet, the researchers say.

"Beekeepers should pay extreme attention to parasite control, not only by acting directly on them, but also by enhancing the bee competence to face the challenge of environmental stress that may negatively influence immunity and health conditions," researchers said, drawing special attention to breeding for resistance and supplementary nutrition in the form of sugars, pollen, and other food sources.

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