Table 5. Comparison of levels of infection (leaf area infected) with isolates from 1998, 1999 and 2000 on cultivars with mlo resistance.

 

 

Date isols. collected

Source

No. of isols

GP

Chariot

Landlord

Riviera

Chalice

Apex

1998

Apex +

6

100

3.2

0.9

7.2

13.8

10.8

1999

Apex +

11

100

3.6

1.2

5.7

13.1

13.4

2000

Apex +

15

100

3.0

0.9

7.7

14.6

12.7

1971-1998

Apex 0

6

100

0.9

0.1

0.4

13.1

5.8