Table 1 Grading criteria for downy mildew of A. carmichaelii

JH

Disease stage 0

Healthy leaf

Control group

JO

Disease stage 1

Infected leaf area < 1/4

Disease group 1

JW

Disease stage 2

1/4 < Infected leaf area < 1/2

Disease group 2

JT

Disease stage 3

1/2 < Infected leaf area < 3/4

Disease group 3

JF

Disease stage 4

Infected leaf area > 3/4

Disease group 4