Pollination by wild and managed insects is critical for most crops, including those providing essential micronutrients, and is essential for food security, the study notes. In the U.S., the production of crops that depend on pollinators generates more than $50 billion a year. According to recent evidence, European honey bees (Apis mellifera) and some native wild bee species are in decline.
At 131 farms across the United States and in British Columbia, Canada, scientists collected data on insect pollination of crop flowers and yield for apples, highbush blueberries, sweet cherries, tart cherries, almond, watermelon and pumpkin. Of those, apples, sweet cherries, tart cherries and blueberries showed evidence of being limited by pollination, indicating that yields are currently lower than they would be with full pollination. Wild bees and honey bees provided similar amounts of pollination for most crops.
The annual production value of wild pollinators for all seven crops was an estimated $1.5 billion-plus in the U.S. The value of wild bee pollination for all pollinator-dependent crops would be much greater.
“Our findings show that pollinator declines could translate directly into decreased yields for most of the crops studied,” the study says. The findings suggest that adopting practices that conserve or augment wild bees, such as enhancing wildflowers and using managed pollinators other than honey bees, is likely to boost yields. Increasing investment in honey bee colonies is another alternative.
James Reilly, a research associate in Winfree’s lab, led the study, which used data collected by researchers at many universities and was part of The Integrated Crop Pollination Project funded by the USDA-NIFA Specialty Crop Research Initiative.