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Producers of fruit and nut tree nursery stock need effective weed control for maximum production of vigorous, high-grade planting material. Current weed practices include methyl bromide fumigation, preemergence herbicides, hand labor, and multiple tillage operations. As methyl bromide use is phased out due to air quality concerns, and fuel and labor costs continue to increase, herbicides are likely to become even more important for weed management in the nursery industry. Before new herbicides can be registered and used in stonefruit (Prunus sp.) tree nurseries, weed control efficacy and crop safety data are needed under local conditions. Eleven experiments were conducted from 2007 to 2011 in California tree nurseries to evaluate the crop safety of preemergence (PRE) and postemergence (POST-directed) applications of various herbicides on commonly grown peach (Prunus persica), plum (Prunus domestica), and peach/plum hybrid rootstocks budded to almond (Prunus dulcis) scions. Rootstocks grown from cuttings generally were more tolerant to herbicides than those grown from seed. Crop safety was adequate in seeded and vegetatively propagated rootstocks with oryzalin, pendimethalin, and isoxaben, all of which are labeled for use in tree nurseries. The unregistered herbicides, dithiopyr, rimsulfuron, oxyfluorfen, and foramsulfuron; as well as lower rates of indaziflam and penoxsulam; applied PRE and POST-directed can provide good to excellent weed control in some stonefruit rootstocks. However, because slight crop injury was occasionally observed, additional work on application rates, timing, and method of application, especially on nonlabeled herbicides is needed before these materials can be considered for registration and broad scale use in tree nurseries.

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Annual consumption of fresh plums in the United States is 0.6 lb per capita, which is lower than that of similar types of fruit such as sweet cherry ( Prunus avium ) and peach ( Prunus persica ) that have an annual per capita consumption of 1.1 and

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. Twelve-year-old ‘Andross’ peach trees, grafted on the peach rootstock ‘GF677’ [a hybrid of peach × almond ( Prunus amygdalus )], were sprayed three times (30 May—15 d before pit hardening; 9 June—at pit hardening time; 24 June—15 d after pit hardening

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that measured the highest in the category “total root length” from each block; 1 cm = 0.3937 inch. Units Literature cited Adams, G. 1983 Propagation and cultivation of Prunus laurocerasus ‘Schipkaensis’. Intl. Plant Propagators’ Soc. Comb. Proc. 33

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Commercial peach ( Prunus persica ) growers in the southeastern United States depend heavily on the early harvest of peaches for their income given their cost of production and postharvest handling. Once later-maturing cultivars become available

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plant inventory. Cal-IPC Publ. 2006-02. California Invasive Plant Council, Berkeley, CA Coastal Plains Plants Wiki 2007 Prunus serotina . 16 Dec. 2018. < http://coastalplainplants.org/wiki/index.php/Prunus_serotina > Coder, K.D. 2016 Invasive trees of

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( Zahedi et al., 2013 ; Zoffoli et al., 2009 )] and sweet cherry [ Prunus avium ( Canli and Orhan, 2009 ; Choi et al., 2002 ; Clayton et al., 2006 ; Horvitz et al., 2003 ; Kappel and MacDonald, 2002 ; Kupferman, 1989 ; Lenahan et al., 2006 ; Sive

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, and Puget Gold. All trees were on ‘Marianna 2624’ plum ( Prunus cerasifera × Prunus munsoniana ) rootstock. The main structure of the high tunnel consisted of vertical metal posts 4 ft apart extending to 4 ft aboveground, with 2-inch polyvinyl

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deciduous fruits to reduced irrigation Hort. Rev. 38 149 189 Berman, M.E. DeJong, T.M. 1996 Water stress and crop load effects on fruit fresh and dry weights in peach ( Prunus persica ) Tree Physiol. 16 859 864 Byrne, D.H. Nikolic, A.N. Burns, E.E. 1991

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Peach ( Prunus persica ) cultivation began in China as early as 1100 bce ( Bassi and Monet, 2008 ). Yet modern breeders continue striving for peach cultivars with improved disease resistance, environmental adaptability, and fruit quality

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