Internal Dry Scale and Associated Bulb Rots of Onion

Lindsey J. du Toit, Tim Waters and Stuart Reitz
PNW 686 | Published May 2016, Reviewed 2023


Onion growers and packers in the Pacific Northwest have observed a problem on red, white, and yellow cultivars: internal dry scale. Bulbs affected by internal dry scale have dead inner scales that are susceptible to fungi, bacteria, and yeasts, which can lead to rot. In addition to outlining the incidences and symptoms of internal dry scale and associated bulb rots of onion, this publication discusses the factors that contribute to it and suggests tactics for limiting it.

About the authors

Lindsey J. du Toit
Tim Waters

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