RT Journal Article SR Electronic T1 Root-Knot Nematodes on Willows: Screening of Salix Species, Cultivars, and Hybrids for Resistance JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 190 OP 196 DO 10.48044/jauf.1990.045 VO 16 IS 7 A1 Santamour, Frank S. A1 Batzli, Janet McCray YR 1990 UL http://auf.isa-arbor.com/content/16/7/190.abstract AB Five clones of Salix alba, two cultivars of S. babylonica, and 25 “weeping willow” clones from various arboreta were susceptible to the root-knot nematodes Meloidogyne arenaria (Race 1 and Race 2), M. incognita, and M. javanica. None of these clones, nor those of 16 other taxa, were susceptible to M. hapla. Clones of some of the other taxa (S. arbutifolia, S. gracilistyla, S. Integra, S. nigra, S. sachalinensis‘Sekka’) were resistant to or tolerant of all the nematodes, and a few taxa exhibited differential susceptibilities. Putative hybrids between a susceptible female S. albaclone and some resistant or tolerant taxa were susceptible to all infective nematode species and races. Short-term greenhouse studies indicated that shoot growth of a S. albaclone could be significantly reduced by nematode infestation but growth of S. babylonica‘Babylon’ was not affected. The fact remains, however, that most of our widely planted landscape willows are highly susceptible to root-knot nematodes and may be more subject to windthrow because of such infestation.