Management of Stem Gall (Protomyces macrosporus) Disease of Coriander (Coriandrum sativum L.) by Triazole Group Fungicides

Abstract

Coriander is important spices crop in Apiaceae family and attack of many diseases on coriander crop during cultivation. The cultivation of seed spice crop suffers from major disease like stem gall (Protomyces macrosporus Unger). In this investigation the effect of seed treatment and foliar spray of hexaconazole 5% SC, propiconazole 25% EC and tebuconazole 25.9% EC were tested against Protomyces macrosporus Unger. The trial was conducted in a Randomized Block Design with three (3) replications and twenty-one (21) treatments including check. Seed treatment and foliar spray at 45, 60 and 75 days after sowing (DAS) by T19 and T21 with minimum incidence of 24.67 and 31.67 per cent respectively and with maximum per cent disease reduction (68.51% and 59.57%) under sick field conditions over control. Seed treatment and foliar spray of hexaconazole and tebuconazole were found most effective against with minimum stem gall disease intensity of 17.33 and 19.83 per cent at 45, 60 and 75 DAS, respectively, over stem gall intensity in control (50.17%). Maximum per cent seed deformation was found in T0 control (14.33%) and highest total yield, marketable yield and per cent increase over control were obtained from hexaconazole 223.33 gram per plot, 215.19 gram per plot and 74.03. %The highest B:C ratio was found in T18 seed treatment by Tebuconazole @ 2 ml/kg seed and foliar spray of tebuconazole 25.9% EC (4.09) @ 0.5 ml/L at 45, 60 & 75 DAS.