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Frederick S. Davies and Glenn Zalman

, including minimum temperature and duration, species ( Hendershott, 1962 ), peel thickness ( Carter and Barros, 1984 ; Hendershott, 1962 ), and fruit maturity ( Calvert, 1977 ; Carter and Barros, 1984 ). Rootstocks also affected the extent of freeze damage

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Jill Marie Calabro, Robert A. Spotts, and Gary G. Grove

. Rootstocks directly control scion vigor, which may indirectly impact the development of P. clandestina . Sweet cherry rootstocks are generally selected based on their promotion of a dwarfing habit and fruiting precocity. Cherry cultivars are known to vary in

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Greg McCollum and Kim D. Bowman

grafted onto a rootstock. Historically, ‘Sour orange’ ( Citrus aurantium L.), believed to be a hybrid of Citrus maxima × Citrus reticulata Blanco ( Grosser et al., 2004 ), has been a favored rootstock for citrus in the Indian River district. However

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William S. Castle

.) rootstock resulted in the production of fruit with high external and internal quality. Trees on sour orange rootstock are well known for producing excellent quality fruit and for thriving well in many challenging types of sites related to soils and drainage

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David H Suchoff, Frank J. Louws, and Christopher C. Gunter

tomato cultivars onto resistant rootstocks is an effective cultural technique for managing BW ( McAvoy et al., 2012 ; Rivard and Louws, 2008 ). This practice is widely used throughout many Asian and Mediterranean countries where intensive greenhouse

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Bradley H. Taylor and Dagmar M. Geisler-Taylor

Use of precocious, high-yielding, dwarfing rootstocks for apple trees in southern Illinois has been limited by the prevalence of fire blight and crown rot diseases, as well as soil and climate stresses. Apple orchards in the region are generally situated on heavy clay soils and often receive excess rainfall in spring and fall, followed by drought in summer. New dwarfing rootstocks adapted to these biotic stresses were used as interstems on robust, vigorous rootstocks, to determine if earlier and greater cumulative yields could be obtained compared to the current industry standard MM. 111. The treatments consisted of 20 various interstem/rootstock combinations with `Ruby Jon Jonathan' as the scion that were propagated and grown as feathered maidens in the nursery. The trees were planted at 4.5 × 6.0 m in a randomized complete-block design with eight replications in May 1996 at the Southern Illinois University Horticultural Research Center at Carbondale, Ill. The trees were trained in a vertical axis system with minimal initial pruning and complete deblossoming in the first 2 years. Trees were allowed to crop during the third- through ninth-leaf. Cumulative yields of the best performing interstem/rootstock combinations were two to three times greater compared with MM. 111. The trees on the most vigorous rootstocks consistently produced the largest fruit size, but four dwarfing clones, G. 30, V. 1, Bud. 9, and M. 7, used as interstems, generally produced higher yields with similar fruit size. These advantages were obtained without the negative side effects (excess root suckers, lack of scion uniformity, and increased mortality) traditionally associated with interstem performance in the lower Midwest.

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Qijing Zhang and Dajun Gu

; and branches with solid pith ( Rehder, 1990 ). Many Prunus species are also important as sources of rootstocks. Furthermore, the genetic resources within the genus are abundant, since the genus comprises ≈200 species, and ≈100 Prunus species are

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Mary Joy M. Abit and Bradley D. Hanson

nursery production practices in California vary among growers, regions, and tree species; however, production cycles usually follow a similar schedule ( Hanson and Schneider, 2008 ). Generally, a rootstock is planted in the field in the fall as either seed

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Shawna L. Daley, Jeffrey Adelberg, and Richard L. Hassell

Grafting watermelon onto disease-resistant rootstocks can confer resistance to soil borne diseases such as fusarium wilt ( Fusarium oxysporum f. sp. niveum ) and monosporascus root rot ( Monosporascus cannonballus ) ( Beltran et al., 2008 ; Guan

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Jesse Wimer, Debra Inglis, and Carol Miles

.g., methyl bromide) are no longer available, whereas others have questionable efficacy ( Klosterman et al., 2009 ; U.S. Environmental Protection Agency, 2013 ; Woodward et al., 2011 ). Thus, grafting onto disease-resistant or -tolerant rootstocks may be the