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midge trap

In a dirt field near a fence on a dairy farm, a black cylindrical canister hangs from a horizontal metal pole attached a vertical pole staked into the ground. Below the canister hangs a cylindrical net with a smaller white cylindrical canister at its bottom.

In a new study seeking to answer how Culicoides biting maintain transmission of bluetongue virus to cattle in temperate regions year after year, researchers conducted extensive collections of host-seeking midges during winter (November to April) over a period of three years in the Chino dairy region of southern California. On the warmest day during each trapping week, carbon dioxide traps such as the one shown here were set up throughout the dairy region to capture host-seeking midges active on that date. (Photo by Xinmi Zhang, Ph.D.)

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