Articles
FLURPRIMIDOL PREPLANT BULB SOAKS CONTROL GROWTH OF POTTED LILIUMS
Article number
900_8
Pages
79 – 87
Language
English
Abstract
In a series of experiments, flurprimidol (Topflor, SePRO Inc., Carmel, Indiana, USA) was applied as a preplant bulb soak to determine its efficacy on growth control of Star Gazer oriental lily (Lilium hybrids), Nellie White Easter lilies (Lilium longiflorum), and vigorously growing tiger lilies (Lilium lancifolium). Emergence date was noted, and the plants were measured at bloom for plant height, plant diameter, and flower number.
Optimal concentrations varied by species.
Preplant bulb soaks of flurprimidol at 25 to 400 mg L-1 were applied to Star Gazer, and a concentration of 25 mg L-1 resulted in plants 47.7 cm tall, which were 22.7% shorter than the untreated control. Orange Tiger lily bulbs were hydrated in 17°C water for 1 h, allowed to drain 1 h, given 10-min soaks of 0 to 160 mg L-1 flurprimidol, and then allowed to drain for 1 h prior to potting.
Flurprimidol at 10 to 20 mg L-1 controlled plant stretch.
Plants were transplanted into a field, and no residual effect of flurprimidol preplant bulb soaks were found on the second year growth.
Rates were confirmed with three additional L. lancifolium cultivars, and cultivar response varied with 10 to 20 mg L-1 being effective for Pink Tiger and Yellow Tiger while 10 mg L-1 was excessive for White Tiger. Nellie White Easter lilies were more responsive to flurprimidol preplant bulb soaks than other lily cultivars.
Optimal concentrations were in the range of 1 to 2 mg L-1 flurprimidol for 9/10 sized bulbs.
Not pre-soaking the bulbs in water or prolonged soaking (≥64 min) the bulbs in flurprimidol increased the plant growth regulator efficacy for Nellie White.
Optimal concentrations varied by species.
Preplant bulb soaks of flurprimidol at 25 to 400 mg L-1 were applied to Star Gazer, and a concentration of 25 mg L-1 resulted in plants 47.7 cm tall, which were 22.7% shorter than the untreated control. Orange Tiger lily bulbs were hydrated in 17°C water for 1 h, allowed to drain 1 h, given 10-min soaks of 0 to 160 mg L-1 flurprimidol, and then allowed to drain for 1 h prior to potting.
Flurprimidol at 10 to 20 mg L-1 controlled plant stretch.
Plants were transplanted into a field, and no residual effect of flurprimidol preplant bulb soaks were found on the second year growth.
Rates were confirmed with three additional L. lancifolium cultivars, and cultivar response varied with 10 to 20 mg L-1 being effective for Pink Tiger and Yellow Tiger while 10 mg L-1 was excessive for White Tiger. Nellie White Easter lilies were more responsive to flurprimidol preplant bulb soaks than other lily cultivars.
Optimal concentrations were in the range of 1 to 2 mg L-1 flurprimidol for 9/10 sized bulbs.
Not pre-soaking the bulbs in water or prolonged soaking (≥64 min) the bulbs in flurprimidol increased the plant growth regulator efficacy for Nellie White.
Publication
Authors
B.E. Whipker, I. McCall, J. Barnes, W. Buhler, B. Krug, C. Currey, R. Lopez
Keywords
Lilium hybrids, L. lancifolium, L. longiflorum, plant growth regulators
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