Evaluation of Fungicidal Resistance among Colletotrichum gloeosporioides Isolates Causing Mango Anthracnose in Agri Export Zone of Andhra Pradesh, India

Six isolates of Colletotrichum gloeosporioides were collected from Agri Export Zone (AEZ) of Andhra Pradesh and one from Tamil Nadu and designated as Cg1 to Cg7. Fungicidal resistance/sensitivity among the isolates was studied using four systemic fungicides viz., carbendazim-50 ppm, thiophanate-methyl-50 ppm, propiconazole-25 ppm and hexaconarole-25 ppm and two non-systemic fungicides viz., mancozeb-l000 ppm and copper oxychloride-1000 ppm in poisoned food technique. All isolates were highly sensitive to sensitive for systemic fungicides except Cg3 which was moderately resistant to thiophanate-methyl. Isolates Cg1, Cg3 and Cg6 were highly sensitive, Cg5 and Cg7 were resistant and Cg2 and Cg4 were highly resistant to mancozeb. All isolates were resistant to copper oxychloride. These results indicated the differential resistance/sensitivity to commonly used fungicides against C. gloeosporioides and allowed to recommend a specific fungicide on regional basis in the Agri Export Zone of Andhra Pradesh, India.