Screening of chrysanthemum cultivars against Alternaria leaf spot disease under natural conditions

An experiment was conducted at K.R.C. College of Horticulture, Arabhavi, UAS Dharwad during Karif season 2004. The experiment was laid out in Randomized Block Design (RBD). There were twelve cultivars viz., Chandini, Bangalore, Raja, Dundi, Sarval, Co-1, No-9, Indira, Karnool, No-5, Co-2, and Gloden Red. Each cultivar replicated three times. Among twelve cultivars, cultivar Indira recorded the lowest Alternaria leaf spot index (2.37%) followed by Co-2 (3.06%) and Co-1 (6.49). The highest Alternaria leaf spot index was recorded in the cultivar Chandini (39.12%) followed by Raja (38.67). Cultivar Indira, Co-2 and Co-1 can be used as a resistant source.