In recognition of Pollinator Week, Sustainable Saratoga is unveiling our newPollinator Committee. This blog post is the first of a series that go in depth on a few pollinator issues.
MEET THE BUMBLEBEES
There are over 255 species of bumblebees worldwide, 49 in the United States and 9 species in our region. Bumblebees are true social insects, meaning that they live in groups and have specialized castes, or roles. They most often live in small, underground colonies with a queen, several hundred sterile female workers and a few males for reproduction (drones). In the winter, the colony dies off, except for the queen. She hibernates underground or slightly above the surface of the ground in plant litter. When she wakes up in March or early April she looks for a good nesting site, usually an abandoned rodent burrow, and feeds on nectar from early-blooming trees. She collects pollen in her nest, then lays eggs on it to start the new colony. For the first brood of the year, the queen tends the larvae, then the female workers take over once they have emerged from their pupae. Both the adults and larvae eat nectar and pollen.
Bumblebees have round, furry bodies and make a characteristic loud buzzing sound when they fly. They have a special kind of behavior, known as “buzz pollination” in which they vibrate their wings to shake pollen loose from the anthers of their host plants. This makes them more efficient as pollinators than honey bees. They are not aggressive like yellow jackets and some other wasps, and very rarely sting people unless their colony is disturbed.
The bumblebee species most common in our area include:
Perplexing or Confusing Bumblebee
Common Eastern Bumblebee
Rusty-patched Bumblebee (endangered)
Click here for more information on these and other New York bumblebees.
Bumblebee populations are in serious decline locally and around the world because of loss of habitat and increasing use of persistent pesticides like neonicotinoids. To support bumblebee populations you can take the following steps:
Plant a variety of native plants that provide season-long sources of nectar and pollen. Goldenrod is a favorite late season flower of bumblebees and a critical host of the endangered Rusty-patched bumblebee.
Don’t use pesticides. Go organic.
Leave bare ground and plant litter, including twigs and leaves, in at least part of your garden. It may look messy to you, but it is home to the bumblebees.
Don’t use dyed wood chip mulches; they create an impenetrable barrier to ground nesting bees, are made at least in part from treated lumber and leach dyes into the soil.
During the growing season, put out a shallow dish of water with twigs and rocks in it so the bees can drink (see an example).