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Wesley C. Randall and Roberto G. Lopez

seedlings, also known as young plants or plugs, have led to a large increase in finish plant quality and profitability ( Armitage and Kaczperski, 1994 ; Kuehny et al., 2001 ). Young plant production occurs in late winter and early spring when the integrated

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Bradley S. Sladek, Gerald M. Henry, and Dick L. Auld

major limitation to the increased use of zoysiagrass. Zoysiagrass establishment by plugs or sprigs can take up to 2 years, or longer, to reach complete coverage ( Hume and Freyre, 1950 ; Sifers et al., 1992a , 1992b ). Delayed establishment may

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Emmanuel A. Torres-Quezada, Lincoln Zotarelli, Vance M. Whitaker, Rebecca L. Darnell, Kelly Morgan, and Bielinski M. Santos

variability in transplant size and flowering pattern ( Bish et al., 1997 ; Hokanson et al., 2004 ). Strawberry plug transplants (SP) are an alternative to BR. The active root system and water retention capacity of the SP allows them to establish with minimal

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Iftikhar Ahmad, Brian E. Whipker, and John M. Dole

( Hickman, 1986 ; Ahmad et al., 2014 ), and decreasing abiotic stresses ( Bañón et al., 2006 ) in ornamental potted and nursery plants. Ancymidol is also used extensively for ornamental plug production and plant growth management ( Miranda and Carlson, 1980

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Brent L. Black, Harry J. Swartz, Gerald F. Deitzer, Bryan Butler, and Craig K. Chandler

to the exclusion of other products or vendors that may be suitable. We gratefully acknowledge the work of student interns Matthew Stevens and Emma Wallace for their assistance in plug conditioning and environmental monitoring. We thank Nihal Rajapakse

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Brian A. Krug, Brian E. Whipker, Ingram McCall, and Jonathan Frantz

concentrations of B and lead to the development of visual symptoms of B deficiency. Materials and Methods ‘Dynamite Yellow’ pansy, ‘White Storm’ petunia, and ‘Festival Apricot’ gerbera seeds were sown in 288-plug trays cut into 2 × 2-cell flats (each cell: 2 cm

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David R. Dreesen and Robert W. Langhans

assimilation rate; PMT, plug medium temperature; PPF, photosynthetic photon flux; QI, quality index. 1 Former Graduate Research Assistant; currently, Research Associate. 2 Professor. Research funded by a grant from the New York State Dept. of Agriculture and

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Edward F. Durner, E. Barclay Poling, and John L. Maas

Plugs are rapidly replacing fresh-dug bare-root and cold-stored frigo plants as transplants for strawberry (Fragaria × ananassa) production worldwide. Plugs have many advantages over these other types of propagules. They are grown in controlled environments (greenhouses, tunnels) in less time than field produced bare-root transplants, and are not exposed to soilborne pathogens. Plugs afford greater grower control of transplanting dates, provide mechanical transplanting opportunities and allow improved water management for transplant establishment relative to fresh bare-root plants. New uses for plugs have been identified in recent years; for example, photoperiod and temperature conditioned plugs flower and fruit earlier than traditional transplants and plugs have been used for programmed greenhouse production. Tray plants have superior cold storage characteristics relative to bare-root, waiting-bed transplants. Both fresh and frozen plugs are used in a number of indoor and outdoor growing conditions and cultural systems.

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Charles W. Marr and Mark Jirak

Tomatoes (Lycopersicon esculentum Mill. cv. Jet Star) seedlings grown in small cells (plugs) in trays holding 200, 406, or 648 plants per flat (28 × 55 cm) were larger after 6 weeks as cell size increased, but all were acceptable. Other seedlings, transplanted at weekly intervals from plug trays to plastic cell packs (48 cells per 28 × 55-cm flat), were of similar size during weeks 1-3; seedlings from 648-plug trays were smaller than the others by week 5-6. Seedlings from 200-plug trays planted at weekly intervals into containers where plant-plant competition was absent were larger through 6 weeks than those from 406- and 648-plug trays. Early marketable and total yields were similar for plants held in 406-plug trays 1 to 4 weeks before their transfer to 48-cell flats, but yield decreased for those held 5 to 7 weeks.

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Sonja Moseman, Terry Ferriss, and William Kidd

The preservation/restoration of prairie ecosystems is part of our responsibility as stewards of the earth. Success in reestablishing prairie plant communities has been quite variable and far from optimum. This cooperative project between the University of Wisconsin-River Falls (UWRF) and Carpenter Nature Center examine the use of horticulture plug technology as a means of improving the quality, availability, production efficiency and transplant survivability of herbaceous frob prairie species for use in prairie restoration efforts.

Data on growth rates and winter survival of bare-root seedlings and plug seedlings of Rudbeckia hirta, Ratibida pinnata and Zizea aurea in prairie test plots will be presented. The plug seedlings were stockier plants, had well developed root systems, and demonstrated excellent performance as transplants in prairie restoration efforts.