Grasses are able to harbor the oversummering of urediospores and the overwintering of teliospores of Puccinia striiformis f. sp. tritici in China

Table 1 Puccinia striiformis f. sp. tritici (Pst) isolates from grass leaf samples (with uredia) collected in Tianshui, Gansu Province, China

Sampling sites	Grass species	No. of samples inoculated	No. of samples producing necrotic or immune reaction on wheat cv. Mingxian 169	No. of samples recovering Pst isolates^a	Percentage^b (%)	Year^c
Chenjiazhuang, Qishou	Agropyron cristatum	174	155	19	10.9	2012
Pingnan, Qinzhou	A. cristatum	56	51	5	8.9	2013
Pingnan, Qinzhou	A. cristatum	70	68	2	2.9	2013
Pingnan, Qinzhou	A. cristatum	24	23	1	4.2	2013
Pingnan, Qinzhou	A. cristatum	190	182	8	4.2	2012
Shuidonggou, Wushan	A. cristatum	66	65	1	1.5	2012
Shuidonggou, Wushan	A. cristatum	20	16	4	20.0	2013
Pingnan, Qingzhou	Elymus cylindricus	204	185	19	9.3	2013
Pingnan, Qingzhou	E. cylindricus	320	302	18	5.6	2013
Pingnan, Qingzhou	E. cylindricus	53	29	24	45.3	2013
Pingnan, Qingzhou	E. cylindricus	266	150	116	43.6	2013
Pingnan, Qingzhou	E. cylindricus	109	107	2	1.8	2013
Tongjiamo, Taijing, Qingzhou	E. cylindricus	66	65	1	1.5	2013
Baizhai, Daimen	E. excelsus	242	198	44	18.2	2012
Laojunshan, Wushan	E. excelsus	35	33	2	5.7	2012
Lvjiapo, Daimen	E. excelsus	17	13	4	23.5	2013
Lvjiapo, Daimen	E. excelsus	54	53	1	1.9	2013
Lvjiapo, Daimen	E. excelsus	33	31	2	6.1	2013
Nanyu, Tianshui	E. excelsus	74	70	4	5.4	2012
Xujiadian, Zaojiao, Qingzhou	E. excelsus	83	82	1	1.2	2012
Baizhai, Daimen	E. excelsus	28	27	1	3.6	2013
Total		2184	1905	279	12.8

^aThis indicates stripe rust-infected grass samples that produce uredia on leaves of highly susceptible wheat cultivar Mingxian 169 seedlings with infection types from 1 to 4 after inoculation
^bPercentage (%) = (the number of samples recovering Pst isolates/the number of samples inoculated) × 100
^cSampling was carried out from September to October in 2012, and August to October in 2013