“…In particular, soil texture, low soil pH, soil depth, tree nutrition, tree age, nematode parasitism, and environmental factors such as rain can influence P. syringae disease development (English et al, 1961(English et al, , 1980Scortichini, 2002Scortichini, , 2010Scortichini et al, 2012;Vigouroux and Bussi, 1994). In addition, cultural practices such as rootstock selection, height of grafting and early fall pruning have been reported to affect P. syringae disease susceptibility of apricot and peach (Dunquesne and Gall, 1975;Fratantuono et al, 1998;Lownsbery et al, 1977;Prunier et al, 1999;Vigoroux et al, 1987Vigoroux et al, , 1997. Likewise, the correlation among tree water content, effect of exposure to freezing temperature, and necrosis caused by P. syringae has been reported for apricot (Klement et al, 1974;Vigoroux, 1989), cherry (Sobiczewski and Jones, 1992), and peach (Cao et al, 2013;Vigoroux, 1999;Weaver, 1978).…”