Relationship of Rhyzoglyphus robini (Acari: Acaridae) to Root Rot1 Control in Greenhouse-Forced Easter Lilies2

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Abstract
Easter lily bulbs, Lilium longiflorum Thumb. “Nellie White,” from Oregon were grown under controlled temperature forcing in a greenhouse to flower at Easter. Various miticide and fungicide treatments were applied to elucidate the relationship between a bulb mite, Rhizoglyphus robini Claparède, and root rot control as caused by Pythium ultimum Trow and Fusarium oxysporum Schl. emend. Snyd. and Hans. Dicofol and aldicarb, regardless of time of application, significantly reduced R. robini numbers. Dicofol also significantly reduced root rot. Tests showed that dicofol had fungicidal as well as miticidal activity. The fungicide combination of benomyl and Truban gave significant root rot control only when mite populations were relatively low. It is concluded that a threshold exists for R. robini in greenhouse-forced Easter lilies above which mite suppression is necessary for adequate root rot control by fungicides.

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