Table 2.

Disease rating scale for the assessment of early blight of tomato

Scale	Description
0	Leaves free from infection
1	< 5% of leaf area affected by small irregular spots
2	5.1–10% of foliage covered with small irregular brown spots with concentric rings
3	10.1–25% of leaf area covered with many coalesced spots, that enlarged into irregular brown spots with concentric rings
4	25.1–50% area of the leaf covered with coalesced lesions to form an irregular and appears as a typical blight symptom
5	Lesions coalesce to form an irregular and appear as a typical blight symptom covering > 50% of leaf area