CATCH THE BUZZ – Manitoba Sees a Short Crop This Year, and Pollen Abundance and Diversity in Major Crops.

By: Geralyn Wichers

Beekeepers have seen their honey supply dry up sooner than usual this year.

Ian Steppler, vice-chair of the Manitoba Beekeepers Association, said almost every honey producer he’s spoken to has had a shorter crop than usual this year — especially in the Interlake.

Steppler, who farms near Miami, said he usually has honey to late August or early September. This year he finished mid-month.

The early finish to the season may be tied to dry weather. Steppler said stressed crops don’t produce as much nectar.

Near Fisher Branch, Paul Gregory said he’s had to begin feeding his bees already, which he attributed to dry conditions.

He said he’s seen a below-average honey crop, in part because the bees don’t have much second-crop alfalfa to feed on.

Steppler said fields in his area also seem to have fewer flowering weeds for bees to forage.

Despite the drawbacks, Steppler said this year has been a record honey crop, most of which was collected in July.

He attributed this to staggered seeding and reseeding of canola in his area, which spread the blooming period out to almost eight weeks. Timely rains and a hot July made for flourishing fields, and flowers that “gave nectar like crazy.”

“I’m very happy with my honey crop this year,” said Steppler.

He said there have also been more sunflowers planted in his area. “That helped me quite a bit when the canola stopped flowering.”

Gregory added that despite a lot of spraying for pests in his area, he hasn’t had any bees killed off.

He said he was “extremely proud” of his neighbouring farmers. He’s come to expect one or two moderate bee kills per year due to pesticide spraying.

Gregory attributed this success to farmers being more concerned for the environment and more careful in how they timed their spraying.

Steppler said his hives are in “terrific” shape for winter.

“We’re going to have to do a lot more feeding,” said Gregory, adding that since they’ve already begun feeding, he expects to feed 25 to 30 per cent more this year.


Researchers Determine Pollen Abundance and Diversity in Five Major Pollinator-Dependent Crops

Some cropping systems may put bees at risk for temporary nutritional deficiency if the crop plant’s pollen is deficient in certain nutrients and bees are unable to find an alternative source of these nutrients

CORVALLIS, Ore. — A new study provides valuable insights into pollen abundance and diversity available to honeybee colonies employed in five major pollinator-dependent crops in Oregon and California, including California’s massive almond industry.

The study, a collaboration between Oregon State University (OSU) and Texas A&M University, found that almond, cherry, and meadowfoam provide ample pollen to honeybees, but highbush blueberry and hybrid carrot seed crops may not. In addition, California almonds don’t provide as much pollen diversity as other crops, according to the findings, published in the Journal of Economic Entomology.

The western honeybee is the major pollinator of fruit, nut, vegetable, and seed crops that depend on bee pollination for high quality and yield. The findings are important because both pollen abundance and diversity are critical for colony growth and survival of the western honeybee, said study corresponding author Ramesh Sagili, associate professor of apiculture and honeybee Extension specialist in OSU’s College of Agricultural Sciences.

“Pollen diversity is important for the growth and development of bees, and low amounts of pollen availability to honeybee colonies can dramatically affect brood rearing,” Sagili said. “Beekeepers that employ their colonies for pollination of crops like hybrid carrot seed and highbush blueberry should frequently assess the amount of pollen stores in their colonies and provide protein supplements if pollen stores are low.”

Nectar and pollen provide essential nutrients for honeybees. A honeybee colony’s protein source is pollen, which has varying amounts of amino acids, lipids, vitamins, and minerals. These nutrients obtained from pollen are essential for honeybee larval development. Pollen largely contributes to the growth of fat bodies in larvae and egg development in the queen.

Well-nourished individuals in a honeybee colony are able to withstand the effects of other stressors such as parasites and insecticides, in addition to the long-distance transport of colonies known as “migratory management.” Bees are trucked across the county to pollinate various cropping systems—more than 1 million hives are transported to California each year just to pollinate almonds.

A diet low in pollen diversity hurts a colony’s defense system, which consequently increases disease susceptibility and pesticide sensitivity. During critical crop bloom periods, growers rent large numbers of honeybee colonies to pollinate their crops. Approximately 2.5 million commercially managed honeybee colonies are used for crop pollination in the United States

Some cropping systems may put bees at risk for temporary nutritional deficiency if the crop plant’s pollen is deficient in certain nutrients and bees are unable to find an alternative source of these nutrients, Sagili said.

“It’s crucial for beekeepers and crop producers to understand the pollen abundance and diversity that honeybees encounter during crop pollination,” he said, adding that blueberry and hybrid carrot seed producers can mitigate nutritional deficiencies by providing supplemental food or forage, including commercially available protein supplements for bees.

Renting colonies to growers for pollination services is a significant source of income for commercial beekeepers, but it also requires them to repeatedly transport the colonies between crops throughout the growing season. In this study, the research team collaborated with 17 migratory commercial beekeepers for pollen collection from honeybee colonies in five different cropping systems from late February to August of 2012.

They installed pollen traps on at least five colonies at each site and collected pollen from the colonies at the height of the blooming season.

They found that California’s vast almond footprint—1 million acres and counting—provides more than enough pollen for the nearly 2 million honeybees employed to pollinate the orchards, but pollen diversity was low when compared with other crops.

“We think the reason for that is almonds bloom early in the year when there are so few plant species in bloom, so bees have few other forage options and primarily rely on almond pollen,” Sagili said. “There are parts of the northern and southern ends of California’s San Joaquin Valley where there are no other crops in bloom when almond trees bloom, which may further contribute to poor availability of diverse pollen.”

Study co-authors are Ellen Topitzhofer, Hannah Lucas, Priyadarshini Chakrabarti, and Carolyn Breece—all researchers at OSU’s Honey Bee Lab—and Vaughn Bryant at Texas A&M’s Palynology Laboratory.

The Oregon State Beekeepers Association provided funding for the study.


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