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Lloyd L. Nackley, Elias Fernandes de Sousa, Bruno J.L. Pitton, Jared Sisneroz, and Lorence R. Oki

Potted flowering plants are a resource-intensive crop because of the premium value for abundant, large, uniform blooms and defect-free foliage. Potted poinsettias [ Euphorbia pulcherrima (Willd. ex Klotzsch) Graham] are one of the most valuable

Open access

Sangho Jeon, Charles S. Krasnow, Gemini D. Bhalsod, Blair R. Harlan, Mary K. Hausbeck, Steven I. Safferman, and Wei Zhang

Floriculture crops in the United States have an estimated wholesale value of $4.4 billion and include a diverse assortment of bedding plants, potted flowers, and cut flowers. Poinsettia contributed a wholesale value of $140 million in 2015 ( U

Free access

William D. Wheeler, Paul Thomas, Marc van Iersel, and Matthew Chappell

significantly impact floriculture production in some, if not all, regions of the United States, which is valued at ≈$4 billion annually [ U.S. Department of Agriculture (USDA), 2015a ]. State and federal regulations that limit water consumption and runoff for

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Todd J. Cavins, Brian E. Whipker, and William C. Fonteno

Most commercial and university substrate testing laboratories' recommended floriculture nutritional values are based on the saturated media extract (SME) method. With the recent gain in popularity of pour-through nutritional monitoring, alternative recommended values are needed for nutrient analyses based on pour-through extracts. Pour-through nutritional values were compared to the SME values to develop calibration curves and recommended nutritional values. Euphorbia pulcherrima `Freedom Red' Willd. ex Klotzch. were grown for two consecutive growing seasons in 16.5 cm plastic pots with Fafard 4 P root substrate and fertigated with 200, 300, or 400 mg·L-1 N from a 13N-0.88P-10.8K fertilizer. Linear relationships existed and inverse calibration curves for pour-through and SME comparisons were developed for (r 2): EC (0.98), NO3 - (0.98), P (0.97 to 0.99), K (0.99), Ca (0.94 to 0.97), and Mg (0.91). In addition, recommended pour-through substrate value ranges were developed for comparison with SME values. The established calibration curves and pour-through substrate value ranges will allow substrate-testing laboratories to make nutritional recommendations based on pour-through extractions.

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James E. Barrett, Carolyn A. Bartuska, and Terril A. Nell

Experiments with' White Christmas' and `Carolyn Wharton' caladiums (Caladium × hortulanum Birdsey), croton (Codiaeum variegatum), brassaia (Brassaia actinophylla Endl.), `Annette Hegg Dark Red' poinsettia (Euphorbia pulcherrima Wind.), and `Super Elfin Red' and `Show Stopper' impatiens [Impatiens wallerana (L.) Hook.f.] determined effectiveness of paclobutrazol in solid spike form as compared to media drench applications for height control. Paclobutrazol drenches and spikes were effective for all crops tested, with a similar concentration response for all, except that drenches had greater efficacy than spikes on caladium. A reduced effect was observed when spikes were placed on the medium surface of `Super Elfin Red' impatiens, while placement in the middle of the pot or around the side was equally effective. These results indicate that the spike formulation of paclobutrazol has potential to provide adequate size control for floriculture crops with the possible exception of rapidly developing crops, such as caladiums. Chemical name used: (2RS, 3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-1,2,4-triazol-1-yl-) penten-3-ol (paclobutrazol).

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Allison H. Justice, James E. Faust, and Julia L. Kerrigan

rooting substrate on the ARF of the URCs of eight species and cultivars that are commonly propagated in the floriculture industry. Materials and methods Inoculation methodology . Piriformospora indica was obtained from P. Franken through the U

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Stephanie Burnett, Neil Mattson, Brian Krug, and Roberto Lopez

additional 8% would like to conserve energy ( Dennis et al., 2010 ). Our group has published several articles on novel techniques to reduce energy. For example, Lopez and Krug (2009) reported that growing medium-vigor poinsettia ( Euphorbia pulcherrima

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Dewayne L. Ingram, Charles R. Hall, and Joshua Knight

Euphorbia pulcherrima (poinsettia) annually ( USDA-NASS, 2016 ). This model enterprise grew ≈32,000 pots in 2015; they were sold at an average price of $4.94 if grown in pots 12.7-cm or larger ($2.14 for those grown in pots smaller than 5 inches). Profit

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David J. Norman and Jianjun Chen

dry and limit spread between plants. Xanthomonas leaf spot of poinsettia ( Euphorbia pulcherrima ) is another important floral crop disease. It was first described in India in 1951 ( Patel et al., 1951 ) and has since been found in nearly every country

Open access

Michael Alden and James E. Faust

( Cockshull, 1976 ). Literature Cited Berghage, R. Heins, R. Carlson, W. Biernbaum, J. 1987 Prevent flower delay Greenhouse Grower 5 78 79 Camberato, D.M. Lopez, R.G. Krug, B.A. 2012 Development of Euphorbia pulcherrima