Abstract
Peronosclerospora sorghi (Weston & Uppal) C.G. Shaw, causes sorghum downy mildew (SDM), a major problem in sorghum (Sorghum bicolor (L.) Moench) production. Use of disease-resistant varieties is a promising method of disease control. In many plant diseases, disease resistance is correlated with changes in certain oxidative enzymes such as peroxidase (PO) and polyphenol oxidase (PPO). The present study was undertaken to investigate changes in the activities of these enzymes in sorghum and P. sorghi interaction.