Efficacy of Fungicides against Protomyces macrosporus causing Stem Gall of Coriander

Coriander is a widely grown crop and suffers from various fungal, bacterial and viral diseases, of which stem gall caused by Protomyces macrosporus in predominant and destructive and of common occurrence. The disease appears in the form of tumour like swellings of leaf veins, leaf stalks, peduncles, stems and on fruits. Out of the seven fungicides tested in vitro, propiconazole, copper oxychloride and mancozeb were found the most effective and significantly superior among all the treatments with 100 per cent mycelial growth inhibition of the pathogen at 100 and 2000 ppm concentrations. Seed treatment of propiconazole and mancozeb was the most effective in managing the disease and also gave higher yield than the other treatments under field conditions. Foliar spray of hexaconazole and propiconazole resulted in 86.27 and 80.27 per cent disease reduction. The highest yield was obtained with hexaconazole giving 152.00 g followed by propiconazole with 143.33 g per 2 m2.