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J.L. Bi and N.C. Toscano

California is a world leader in strawberry production. Since the late 1990s, strawberry production has been threatened by a major insect pest, the greenhouse whitefly, Trialeurodes vaporariorum Westwood (Homoptera: Aleyrodidae) ( Bi et al., 2002

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W.C. Lin and D.L. Ehret

supported by the B.C. Greenhouse Vegetable Research Council. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this

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Kimberly Moore, Scott Greenhut, and Wagner Vendrame

to 128 m 3 ·GJ −1 electricity. Little research has been conducted on the feasibility, methods, and costs of greenhouse and field production of jatropha in the United States. Jatropha is easy to propagate, hardy, and grows relatively fast ( Openshaw

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Alexander Miller, Petrus Langenhoven, and Krishna Nemali

in winter than in other seasons due to decreased field acreage and production. However, maintaining an optimal environment for lettuce in a greenhouse can be challenging with prevailing light and temperature conditions during winter in the northern

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Y. Zhang, L. Gauthier, D. de Halleux, B. Dansereau, S. Yelle, and A. Gosselin

82 POSTER SESSION 12 Greenhouse Management/Cross-Commodity

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Sophia Kamenidou, Todd J. Cavins, and Stephen Marek

supplementation of hydroponically cultured gerbera resulted in a higher percentage of flowers grading as Class I and significantly thicker flower stems ( Savvas et al., 2002 ). Silicon is a predominant element in mineral soils. However, in greenhouse

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Jennifer H. Dennis, Roberto G. Lopez, Bridget K. Behe, Charles R. Hall, Chengyan Yue, and Benjamin L. Campbell

The $147.8 billion U.S. green industry includes nursery and greenhouse producers, landscape service providers as well as wholesale and retail distributors ( Hall et al., 2006 ). The wholesale value of plant production by nurseries in the top 17 U

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Pedro García-Caparrós, Olga González-Salmerón, Mónica Pérez-Saiz, Raquel Calatrava, María Teresa Lao, Rosa María Chica, and Gumersindo De la Cruz

different types of shelter and in the open air ( Pérez-Saiz et al., 2017 ). The greenhouse technology creates a favourable microclimate for high crop productivity and also reduces the use of fertilizers and pesticides in comparison with open field conditions

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Gene A. Giacomelli and William J. Roberts

The diversity of coverings for the greenhouse and other plant production structures has increased dramatically during the past 4 decades. This has resulted from the availability of new types of covering materials and enhancements of previously existing materials, as well as the demands for technological improvements within the expanding controlled environment agricultural industry. The types of coverings currently available are dominated by plastics. These range from traditional glass to the recent advent of polymer plastics, such as thin films or multilayer rigid thermoset plastic panels. Available enhancements such as ultraviolet radiation (UV) degradation inhibitors, infrared radiation (IR) absorbency, and anti-condensation drip surfaces, as well as their physical and spectral properties are discussed. The selection of specific covering alternatives has implications for the greenhouse superstructure and its enclosed crop production system.

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Judy Lee and William B. Miller

potted Ornithogalum , more information on preplant environmental conditions and greenhouse protocols is needed. Determination of proper temperature sequences for the entirety of bulb production and utilization is an important aspect of flower bulb