Bio Efficacy of Conika 50% WP against Citrus Canker Caused by Xanthomonas axonopodis pv.citri in Citrus (Citrus aurantiifolia)

Citrus canker is one of the most damaging bacterial diseases of citrus. This disease is caused by Xanthomonas axonopodis pv. citri, which occurs in large areas of the world's citrus growing countries including India. An experiment was conducted in Abohar, Punjab during 2018 to find out suitable bactericide to combat the citrus canker disease. Experiment was laid out in randomized block design (RBD) with four replications consisting seven different treatments. The first spray of bactericide was done at the start of citrus canker infection and second spray after 15 days of first spray using 750 liters of water/ha in the month of August-September, 2018. Bio-efficacy of three different doses of Conika 50% WP (Kasugamycin 5% + Copper Oxychloride 45%) @ 1.0 g/l, 1.5 g/l, and 2.0 g/l were compared with Kasu-B (Kasugamycin 3% SL) @ 2.0 ml/l, Dhanucop (Copper Oxychloride 50% WP) @ 2.5 g/l and Roko (Thiophanate methyl 70% WP) @ 1 g/l along with untreated control. Application of all bactericides reduced significantly citrus canker disease incidence. After 2^nd spray of Conika 50% WP @ 2.00 g/l of water recorded minimum of 2.96 and 2.22 PDI (Per cent Disease Incidence) which was at par with Conika 50% WP @ 1.50 g/l water of 3.33 and 2.41 PDI on leaves and fruits, respectively as compared to rest of the treatments. Maximum disease reduction over untreated control was also recorded in Conika 50% WP @ 2.00 g/l of water (85.45 & 85.37%) and 1.50 g/l of water (83.64 & 84.15%) on leaves and fruits, respectively. It has been concluded that Conika 50% WP @ 1.5 g/l of water is the effective dose for the control of citrus canker disease in citrus.