Management of Foliar Diseases in Jasmine

Jasmine is the most attractive flower crop cultivated throughout tropical and subtropical countries. In Tamil Nadu jasmine cultivation is highly interrupted by the foliar diseases caused by Colletotrichum jasminicola and Alternaria jasmini are economically important diseases which leads in yield loss and quality of flowers. The present study was conducted with fungicides and bio agents under field conditions based on their efficacy tested under invitro conditions. Among the eight treatments imposed, foliar spray with Tebuconazole 50% + Trifloxystrobin 25 % at 0.1% on 30,60 and 90 days after planting was found to be effective in reducing the Colletotrichum leaf spot disease (14. 20 PDI) and Alternaria leaf spot to 17.53 PDI with increased per plant yield (1350 g) and an estimated yield of 8.64 t/ha, also recorded the highest BC ratio of 3.77 as compared to untreated control which recorded 35.45 PDI, 44.15 PDI, 180 g and 3.89 t/ha respectively. The next effective treatment was fungal and bacterial bio agent consortia @100g /pit (Bacillus+Trichoderma) with FYM at the time of planting+ foliar spray with fungal and bacterial bio agent consortia @ 0.2% on 30, 60 and 90 days after planting which recorded the lowest Colletotrichum disease intensity (24.80 PDI) Alternaria leaf spot intensity of 27.78 PDI with an increased per plant yield (1012.50 g) and an estimated yield (6.48 t/ha) with CB ratio of 2.82.