Table 1. Differential set and identified virulence frequencies for powdery mildew
populations from the Czech Republic and North Dakota

Order Line Major
Virulence frequency (%)
  (cultivar) gene
CR
ND
1 P01 Mla1
56
0
2 P02 Mla3
13
89
3 P03 Mla6
75
0
4 P04B Mla7
91
27
5 P08B Mla9
54
0
6 P10 Mla12
69
37
7 P11 Mla13
53
0
8 P17 Mlk
70
4
9 P23 MlLa
82
83
10 P20 Mlat
41
5
11 P21 Mlg
96
0
12 Borwina Ml(Bw)
99
-
13 P19 Mlp
- *
65
14 P24 Mlh
-**
98
15 Pallas Mla8
-**
97
Number of isolates
351
95
Number of pathotypes
193
32

- Not studied, * ÷0%, ** ÷100%