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Table 1 Key of disease severity of sunflower powdery mildew

From: Biological control of Golovinomyces cichoracearum, the causal pathogen of sunflower powdery mildew

Grade

Description

Reaction

0

No symptom of powdery mildew on leaves

Immune (I)

1

Small scattered powdery mildew specks covering 1% or less leaf area

Highly resistant (HR)

3

Small powdery lesions covering 1 to 10% leaf area

Resistant (R)

5

Powdery lesions enlarged covering 11 to 25% leaf area

Moderately resistant (MR)

7

Powdery lesions coalesce to form big patches covering 26 to 50% leaf area

Susceptible (S)

9

Big powdery patches covering 51% or more of leaf area and defoliation occur

Highly susceptible (HS)