INOCULUM LEVELS of PERONOSCLEROSPORA SORGHI in RELATION TO MAIZE DOWNY MILDEW DISESE OUTBREAK.

Document Type : Original Article

Authors

Plant Pathology Res.Inst.,ARC,Giza, Egypt.

Abstract

Recently, downy mildew of maize caused by Peronosclerospora sorghi causes serious losses in maize seed production in Egypt. The downy mildew incitant was detected in seed samples in a various range of infection levels. The obtained results suggest that approxemitely 60% of the infected maize seeds will give rise to infected plants when mature. The correlation of seed infection level /disease development was eight / five. Seed dressing decreased disease seed transmission by about 75%. Fungicidal seed treatment when applied by the solvent infusion method resulted in satisfactory control and reduced disease to about 10% .