Table 2. Virulence frequencies (%) of Puccinia coronata isolates from Israel in 1996 and 1998 to crown rust differentials with single resistance genes.

Differential^1	Menashe, 1996 A. sativa^2	Tel Aviv, 1996 A. sterilis	Menashe, 1998 A. sativa
Pc-14	95	72	95
Pc-35	63	84	60
Pc-36	11	4	64
Pc-38	16	32	43
Pc-39	89	100	48
Pc-40	95	96	88
Pc-45	89	92	5
Pc-46	95	96	48
Pc-48	68	72	14
Pc-51	11	60	26
Pc-52	5	36	14
Pc-54	89	96	17
Pc-56	11	8	60
Pc-57	89	88	2
Pc-58	26	40	0
Pc-59	11	24	48
Pc-60	37	60	71
Pc-61	58	40	74
Pc-62	47	16	0
Pc-63	0	0	31
Pc-64	68	28	14
Pc-67	47	48	17
Pc-68	0	0	0
Pc-70	74	76	29
H548	68	76	10
X117-1964-15-4	5	16	43
X424-2	0	12	45
X465	95	100	100
X475	11	48	57
X534	11	8	64
X537	32	52	95
X716	11	8	74
X721	63	20	95
Y346	68	88	38
Y347	74	68	83
Number of isolates	25	18	42
Mean complexity^3	16.3	17.6	15.7

¹ Differentials not identified by known Pc genes are backcross lines from the Iowa multiline breeding program with unidentified crown rust resistance genes from A. sterilis.

² Host from which isolates of P. coronata were collected.

³ Mean number of virulences identified per isolate.