Ellen Topitzhofer

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Senior Faculty Research Assistant 1

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Department/Unit: Horticulture

Content by Ellen Topitzhofer

Dissecting honey bees for tracheal mites (in English)

Tracheal mites (Acarapis woodi) infest and breed in the tracheae of honey bees. (Tracheae are fine tubes in the insect’s body that convey air to the tissues.) It’s not possible to diagnose a tracheal mite infestation ...

Ellen Topitzhofer, Carolyn Breece, Ramesh Sagili | Dec 2025 | Video

Northern Giant Hornet: A Potential Threat to Honeybee Colonies in Oregon

The northern giant hornet was detected in British Columbia and Washington in 2019. This publication outlines the identification, life cycle, and predatory habits of the northern giant hornet (Vespa mandarinia) for ...

Ellen Topitzhofer, Chris Hedstrom, Priyadarshini Chakrabarti Basu, Andony Melathopoulos, Silvia I. Rondon, Gail Langellotto, Ramesh Sagili | Sep 2022 | OSU Extension Catalog

Nosema Analysis in Honey Bees (in English)

Nosema is a microsporidian parasite that infects the gut of a honey bee. (Microsporidia are spore-forming fungi.) Nosema affects protein metabolism in honey bees and causes them to starve. In this video, we demonstrate how to ...

Ellen Topitzhofer, Carolyn Breece, Ramesh Sagili | Jul 2024 | Video

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