The powdery mildew disease intensity was also assessed by scoring 20 plants (25 leaves/plant) selected at random,
on a scale of 0–5 (0 – No infection,1 – 1–10%, 2 – 10.1–15%, 3 – 15.1–25%, 4 – 25.1–50%
and 5– >50% of leaf area infected with powdery growth) given by Tajider et al. (1994). The per cent disease index (PDI) was calculated using Mckinney (1923) infection index.