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The common name of bumble bee possibly comes from their rather large clumsy appearance and loud buzzing sound they make as they fly. In the urban setting, bumble bees occasionally nest in structures, beneath landscape features and are of concern because of their abundance around the many flowering plants typical of yards, and because they can sting. There are about 45 species (in Bombus) in the United States and Canada, and about a dozen species in Ohio.

Recognition

The adult worker body length is 1/2 to 1 inch, while queens measure 3/4 to 1inch or more long. Bumble bees are robust in form with an overall fuzzy appearance, including the top surface of abdomen. They are broadly banded with black and yellow (rarely orange) patterns. The stinger is usually not left behind when used. [The honey bee leaves behind its stinger when used.]

Similar Insects

(1) The eastern carpenter bee (Xylocopa virginica) has the top surface of the abdomen largely bare and shiny black. (2) Some robber flies (Asilidae: Laphria species) have a bumble bee-like appearance but have only 1 pair of wings. (3) The bumble bee hawk moth or snowberry clearwing (Hemaris diffinis) has siphoning mouthparts and black fuzz-like scales edging the wings. This is a daytime-flying moth that hovers at nectar-bearing flowers as it feeds.

Biology

Bumble bees are social insects which live in nests and colonies. The adults are represented by workers which are sterile females, queens, and males (drones) which come from unfertilized eggs and usually appear in late summer.
Typically, only inseminated queens overwinter and do so underground. In the spring, the Bombus queens select a suitable subterranean cavity, surface grass clump or fiberglass insulation in a structural void as a nesting site. Then the Bombus queen fashions a honey pot of wax scales near the nest entrance into which she regurgitates nectar. Next she makes a pollen clump on the nest floor and lays 8-10 eggs on it. The queen will periodically add pollen and nectar to the peripheral edges of the clump, and eventually more eggs.

Developmental time (egg to adult) is 16-25 days, with 4 larval molts. Workers live about 2 weeks. Most first brood workers are small due to nutrition. The queen will increase the number of eggs laid as the number of workers to care for them increases. Workers assume the task of creating wax honey pots, which have the appearance of yellowish-brown grapes in flat clusters.

In late summer, a mature bumble bee nest ultimately contains about 50-400 bees and brood (larvae and pupae) at any given time. In the late summer only males (drones) and new queens are reared in the nest. Once these new queens emerge, they mate and find a suitable place to overwinter. The males, workers, old queen, and any virgin new queens die with the onset of cold weather.

Habits

Overwintered queen bumble bees will select an appropriate nesting site the following spring. Some queens locate a small, dark cavity containing fine plant fiber, in which to nest. The abandoned underground nests and burrows of mice, voles and chipmunks are favorable sites. Other queens select a dense clump of grass on the surface or sheltered pile of grass clippings for a nest.

Bumble bees foraging for nectar fly at 7-12 mph and spend only 2-4 minutes inside the nest between trips. Probably they will travel at least 3 miles if necessary for nectar. They orientate by the sky's polarized light via their 3 ocelli (simple eye spots clustered on top of the head), so they can forage at early dawn and at dusk when objects and landmarks are not well-lighted. They use their theromoregulation procedure to warm up flight muscles before the sun rises and to also forage when temperatures are below 50° F. Each worker forages independently, and bumble bees never exchange food. Old cocoons are used to store both pollen and nectar. Only enough food (honey and pollen) for a few days is stored at any given time which helps discourage nest predation by skunks, foxes, etc.

Defense is usually done by using their relatively smooth stingers which can be used repeatedly. Some species will also spray feces, and some cover the intruder with regurgitated honey. People sensitive to insect venom should exercise care around bumble bee nests. The sting of bumble bees is sharply painful and usually results in considerable swelling.

Cultural Control & Preventative Measures

During the day find the location of each nest by observing where the bees disappear into the ground, grass clump, or structure. The location of the entry hole can be marked with a small, brightly colored object placed near it to facilitate discovery by the pest management professional who comes to treat the colony. Under no circumstances should the entrance hole to a structural nest be closed off until the colony has been destroyed.


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Bumble Bee Pest Control