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Apr. 20, 2009 10:58 AM

Spring is the swarming season for most subterranean termites. There are several subterranen termite species and they don't all swarm at the same time. (On the other hand, dampwood and drywood termites typically swarm in the summer.) Species generally swarm based on favorable weather conditions. Varying conditions may mean that swarms will occur at different times. For example, some species prefer more moisture than others. Separation in swarm timing may be a matter of a few weeks, or time of day. Swarms can be loosely linked to the blooming of certain trees. For example, one of the Eastern subterranean species typically swarms when the dogwood tree buds swell and the flowers first appear. The swarming of a closely related species was once linked to the blooming of chestnut trees, but a blight killed most of those trees, so we have to find another marker.