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Attracting wild bees to farms is a good insurance policy

EAST LANSING, Mich. -- Investing in habitat that attracts and supports wild bees in farms is not only an effective approach to helping enhance crop pollination, but it can also pay for itself in four years or less, according to Michigan State University research.

The paper, published in the current issue of the Journal of Applied Ecology, gives farmers of pollination-dependent crops tangible results to convert marginal acreage to fields of wildflowers, said Rufus Isaacs, MSU entomologist and co-author of the paper.

"Other studies have demonstrated that creating flowering habitat will attract wild bees, and a few have shown that this can increase yields," he said. "This is the first paper that demonstrates an economic advantage. This gives us a strong argument to present to farmers that this method works, and it puts money back in their pockets."

As part of the study, marginal lands surrounding productive blueberry fields were planted with a mix of 15 native perennial wildflowers. The fields were pollinated by honey bees, but Isaacs and Brett Blaauw, MSU graduate student, were interested in whether increasing the wild bee population would improve pollination in nearby crop fields. The results weren't immediate, which implies that landowners would need to be patient, Isaacs said.

"In the first two years as the plantings established, we found little to no increase in the number of wild bees," he said. "After that, though, the number of wild bees was twice as high as those found in our control fields that had no habitat improvements."

Once the wild bees were more abundant, more flowers turned into blueberries, and the blueberries had more seeds and were larger. Based on the results, a two-acre field planted with wildflowers adjacent to a 10-acre field of blueberries boosted yields by 10-20 percent. This translated into more revenue from the field, which can recoup the money from planting wildflowers.

With 420 species of wild bees in Michigan alone, it makes sense to attract as many free pollinators as possible. However, this doesn't mean that this approach would replace honey bees, which are trucked in via beekeepers and pollinate crops valued at $14 billion nationwide, Isaacs said.

"Honey bees do a great job of pollinating blueberries, and we're not suggesting that growers stop using them," he said. "But, our research shows that adding some wild bee habitat to the farm can increase bee abundance in the nearby crop, can be profitable and is an insurance policy to make sure there is good pollination each year."

Establishing habitat for wild bees requires an initial investment, but there are existing federal and statewide programs, such as the USDA's Conservation Reserve Program and Michigan's State Acres for Wildlife Enhancement, to help pay for this. In such cases, growers could see their return on investment even quicker.


Contact: Layne Cameron
Michigan State University

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