Effect of Root Rot 1 and Rhizoglyphus robini2 on Greenhouse-Forced Easter Lily Development 34

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Abstract
Easter lily bulbs, Lilium longiflorum, Thumb., “Ace”, from Oregon contained an average 1.95 Rhizoglyphus robini Claparède per bulb. Bulbs inoculated with Pythium ultimum Trow and Rhizoctonia solani Kuhn. produced smaller plants with fewer buds and had more root rot and mites than uninoculated plants. Benomyl and Truban® applications significantly reduced root rot, partially alleviated fungal influence on bud counts, and fully alleviated fungal influence on plant height but had no influence on R. robini numbers. A 30-min dicofol soak before potting significantly reduced bulb mite numbers. No relationship was found between mite number and root rating, bud count, plant height, or days to flower. No treatment differences were found for number of days from plant emergence to first flower. A modified Berlese-Tullgren system used to extract mites was more sensitive and convenient than visual examination of individual bulbs.

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