Table 3.

General reaction responses ofBlumeria graminisisolates collected from different hosts on triticale, wheat and rye cultivars^a

Source hosts (origin of isolates)b	Inoculated hosts
	Triticale	Wheat	Rye
B.g. f.sp. ‘triticale’ (n = 35)	+++	++	−
B.g. f.sp. tritici (n = 35)	+	+++	−
B.g. f.sp. secalis (n = 2)	+	−	+++

^a + indicates infection, − indicates no infection; a higher amount of + corresponds to a higher aggressiveness. Aggressiveness is interpreted here both as a quantitative and qualitative component of pathogenicity. Quantitatively as a higher amount of colonies with well developed hyphae and abundant conidia. Qualitatively as more isolates which are able to infect a particular host or cultivar.

^b Number in parenthesis indicates the number of isolates from each source host that were used in this experiment.