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Jennifer K. Boldt and James E. Barrett

A daminozide plus chlormequat chloride tank mix spray was applied to six Coleus cultivars or breeding lines at different times during propagation. For UF 03-8-10 and `Coco Loco', plants sprayed on day 7 or day 10 were shorter than control plants at transplant, but plants sprayed on day 13 were not. Other cultivars did not respond to single applications. Five of the six cultivars responded to application on days 7 and 13. Plants of UF 03-8-3 and `Coco Loco' were significantly shorter than control plants at transplant. Plants of UF 03-8-10, UF 03-6-1, and UF 03-17-8 were shorter than control plants at 3 weeks after transplant. `Hurricane Louise' did not respond to the tank mix. A second study found a cultivar specific response to three chemical treatments applied as a spray on day 10 of propagation. At transplant, UF 03-8-10, UF 03-8-3, UF 03-6-1, and `Coco Loco' plants sprayed with the tank mix at 2500 plus 1500 mg·L-1, respectively, were significantly shorter than the control plants. A uniconazole spray at 2 mg·L-1 reduced elongation in UF 03-8-10, UF 03-8-3, and UF 03-6-1, compared to control plants. Ethephon at 250 mg·L-1 reduced elongation in UF 03-8-10, UF 03-8-3, and `Coco Loco' plants. None of the chemical sprays reduced elongation in `Hurricane Louise' at the concentrations applied. Ethephon increased axillary branching in all cultivars, and induced lower leaf abscission in UF 03-17-8 and `Hurricane Louise'; leaf malformation in UF 03-6-1 and `Coco Loco'; and color alteration in UF 03-6-1, UF 03-8-3, and `Coco Loco'.

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S.M. Scheiber, R.C. Beeson Jr, J. Chen, Q. Wang and B. Pearson

to determine effects of irrigation quantity and irrigation frequency on shoot and root growth, actual evapotranspiration, and nitrate leaching from simulated landscape beds of Solenostemon scutellarioides (L.) Codd ‘Yalaha’ (coleus). Plants were

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Kristin L. Getter and Bridget K. Behe

preferred followed by Browallia speciosa and then Impatiens hawkeri . Solenostemon scutellarioides was preferred least. For the second conjoint question set (partial shade-tolerant species), three impatiens alternative species also scored a positive

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Yanjun Guo, Terri Starman and Charles Hall

plants to maintain higher visual quality during postproduction. Materials and Methods Plant material and growing conditions. Rooted cuttings of coleus ( Solenostemon scutellarioides ) ‘French Quarter’, petunia ( Petunia × hybrida ) ‘Colorworks Pink

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Brian K. Hogendorp and Raymond A. Cloyd

(Expts. 2 through 4). Expt. 1: Effects of potassium bicarbonate (MilStop ® ) on the citrus mealybug. Sixty plants of green coleus, Solenostemon scutellarioides (L.) Codd., were started from cuttings taken from stock plants and transplanted into 15.2-cm

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Nathan J. Herrick and Raymond A. Cloyd

predation by adult rove beetles and survival of fungus gnat larvae when feeding on coleus, Solenostemon scutellarioides L. Codd, roots under greenhouse and laboratory conditions. The goal of our study was to obtain information associated with production

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Amy L. Shober, Christine Wiese, Geoffrey C. Denny, Craig D. Stanley, Brent K. Harbaugh and Jianjun Chen

with 20% vermiculite and 20% perlite. Plant materials and experimental design. Three annual bedding plant species, Solenostemon scutellarioides L. Codd ‘Wizard Velvet’, Tagetes patula L. ‘Safari Queen’, and Begonia × hybrida ‘Dragon

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Andrew Koeser, Gary Kling, Candice Miller and Daniel Warnock

Despite consumer interest in biocontainers, their use in commercial greenhouse production remains limited. Previous research indicates that a perceived incompatibility of biocontainers with current production systems may be a barrier to their widespread adoption. This article investigates two potential areas of concern for growers looking to adopt biocontainers as part of their production process: 1) the ability of biocontainers to withstand the rigors of a semimechanized commercial production process, and 2) biocontainer performance under three different irrigation methods (i.e., hand, ebb-and-flood, and drip irrigation). In the two studies presented here, ‘Florida Sun Jade’ coleus (Solenostemon scutellarioides) was evaluated to match measures of container resiliency with plant performance. Results indicate that plants grown in biocontainers were of equal size and quality as those grown in conventional plastic containers within each of the irrigation types tested. However, some biocontainers were more prone to damage during crop production, handling, and shipping.

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Eugene K. Blythe, Jeff L. Sibley and Ken M. Tilt

Stem cuttings of Hydrangea paniculata Sieb., Rosa L. `Red Cascade', Salvia leucantha Cav., and Solenostemon scutellarioides (L.) Codd `Roseo' were inserted into six rooting substrates: monolithic slag [(MgFe)2Al4Si5O18], sand, perlite, vermiculite, Fafard 3B, or fine pine bark. Rooting, initial shoot growth, and ease of dislodging substrate particles from root systems upon bare-rooting by shaking and washing cuttings rooted in monolithic slag were compared to cuttings rooted in the five other substrates. Rooting percentage, number of primary roots per rooted cutting, and total root length per rooted cutting for cuttings rooted in monolithic slag were generally similar to the five other substrates. Particles of monolithic slag were dislodged more readily from root systems by shaking than were the other substrates. Gentle washing removed almost all particles of monolithic slag and sand from the root systems of all taxa and removed almost all particles of pine bark from all taxa except S. scutellarioides `Roseo'. Monolithic slag had a bulk density similar to sand, retained less water than the other substrates, and was similar to perlite, vermiculite, and pine bark in particle size distribution. Our studies indicate that monolithic slag, where regionally available, could provide a viable material for producing bare-root cuttings.

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Sloane M. Scheiber and Richard C. Beeson

Previous research indicated that bedding plants can be maintained in landscape soils allowed to dry to substantially less than field capacity before irrigation; however, canopy size and aesthetic quality were compromised. Continuing this research, Solenostemon scutellarioides (coleus) were grown in drainage lysimeters in an open-sided clear polyethylene-covered shelter to assess growth characteristics and landscape quality when irrigated at various managed allowable deficits. Using tensiometers, plants were irrigated back to field capacity when 30%, 40%, or 50% of plant available water within a soil was depleted. Deficits were evaluated against a control treatment of 1.25 cm daily irrigation. Additional plants were grown in a companion open field plot. Growth indices, biomass, irrigation volumes, and landscape quality ratings were recorded. No differences in final height, growth index, shoot or root dry weights, total biomass, or shoot-to-root ratios were found among treatments for either lysimeter or companion field plots. Landscape quality was comparable among treatments. However, total irrigation volume applied was significantly greater for the control treatments than deficit irrigation treatments. On average, irrigation volumes were 4.75-fold greater for daily irrigation in comparison to other treatments.