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  • Author or Editor: R. J. Henny x
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Abstract

Detached leaves from 11 Aglaonema species or cultivars were subjected to 4.4°C for 36 and 72 hr during the summer and winter. Five genotypes showed no visible damage, 2 showed slight damage in one of 4 tests, 4 were injured in all 4 tests. The 4 genotypes expressing most sensitivity to chilling were genetically related. Data indicate there is a possibility of developing chilling resistant Aglaonema hybrids by selecting resistant plants as parents.

Open Access
Authors: and

Abstract

Of 4 Spathiphyllum species and 5 cultivars tested for sensitivity to Cylindrocladium spathiphylli root and petiole rot, 3 demonstrated resistance. Spathiphyllum floribundum, S. floribundum ‘Mini’, and S. cannifolium were resistant, whereas all others tested were susceptible. Twenty hybrids from a cross of S. lechlerianum × S. floribundum also were tested and found resistant to C. spathiphylli, indicating potential for development of new Spathiphyllum cultivars resistant to this serious pathogen.

Open Access

Abstract

Episcia cupreata (Hook.) Hanst. ‘Pink Panther’ plants were drenched with 0, 0.07, or 0.21 mg a.i. paclobutrazol and given night interruption lighting (NIL) of 4 hr (2200-0200 hr) at 2.6 μmol·s−1·m−2 or no light interruption. Paclobutrazol and NIL did not affect days to first flowering, while flower numbers per plant increased exponentially over time on paclobutrazol-treated and control plants. NIL increased flowers per plant from day 47 on. Flower longevity was greater on paclobutrazol-treated plants than controls. Plant size (canopy radius) was reduced by paclobutrazol, which caused a greater flower density per canopy area. Chemical name used: (R*, R*)-(±) β-[(4-chlorophenyl)methyl]-α-(l,l-dimethylethyl)-1H-l,2,4-triazole-1-ethanol (paclobutrazol).

Open Access
Authors: and

Abstract

Treatment of Spathiphyllum ‘Tasson’ with BA as a soil drench at 250, 500, and 1000 mg/liter significantly increased the number of basal shoots compared to untreated plants, or plants treated with a foliar BA spray. The largest increase in number of shoots on drenched plants occurred during the first 8 weeks following treatment. Increase in height of drenched plants was less compared to untreated or sprayed plants after 20 weeks. Fresh weight of main stems from sprayed and drenched plants (less roots) was less than controls, whereas fresh weight of basal shoots was greater for treated plants. Combined weights of the main shoot and basal shoots for all sprayed and drenched plants were not significantly different. Chemical name used: N-(phenylmethyl)- 1H-purin-6-amine (BA).

Open Access

One cut-flower and 14 pot anthurium cultivars were screened for resistance to anthurium blight by spraying four isolates of Xanthomonas campestris pv. dieffenbachiae (McCulloch and Pirone) Dye onto leaf surfaces in replicated experiments. Varying degrees of resistance were observed among the 15 cultivars tested. The pot cultivars Julia and Gemini were the most resistant, while the cut-flower cultivar Hearts Desire was the most susceptible. Each cultivar displayed different degrees of resistance to individual isolates of the pathogen. The results of this research permit the selection of clones with greater resistance for use in breeding and also create a baseline for comparing resistance of newly developed cultivars.

Free access

Twenty commonly grown Dieffenbachia cultivars were tested for their resistance to diseases affecting production caused by the following bacterial and fungal pathogens: Xanthomonas campestris pv. dieffenbachiae (McCulloch and Pirone) Dye, Erwinia chrysanthemi Burk, Fusarium solani Sacc, and Myrothecium roridum Tode ex Fr. Two isolates of each pathogen were used to compare heterogenic pathogen populations to the relatively homogenetic asexually produced cultivars. Cultivars having horizontal resistance toward tested pathogens could then easily be identified. The cultivars Camille, Compacta, and Parachute showed the broadest horizontal resistance, with resistance toward three of the four pathogen groups tested. Disease resistance identified in this research permits the selection of plants to be used in breeding, and also creates a baseline to compare resistance of newly developed cultivars.

Free access

Species and cultivars of Dieffenbachia Schott. (Araceae Juss.) have been important ornamental foliage plants for many decades. Their attractive foliar variegation, adaptability to interior environments, and ease of production are major reasons for their importance as ornamental foliage plants. Approximately 20 cultivars are commercially produced in Florida. Previously, most new cultivars were clones introduced from the wild or chance mutations of existing cultivars. Currently, cultivars are introduced into production from plant breeding programs (Henny 1995a, b; Henny and Chen, 2003; Henny et al., 1987). The hybrid Dieffenbachia `Sterling' was developed by the tropical foliage plant breeding program at the Mid-Florida Research and Education Center.

Free access