Management of foliar blight (Alternaria chrysanthemi Simmons & Crosier) of chrysanthemum

Field experiments were carried out for three consecutive years i.e, 2009–2010, 2010–2011 and 2011–2012 at Horticultural College and Research Institute, Anantharajupet, Kadapa (Dt) to study the effect of different fungicides viz., chlorothalonil (0.2%), captan (0.2%), azoxystrobin (0.075%), propiconazole (0.1%), tebuconazole (0.1%) and benomyl (0.1%) for the management of foliar blight of chrysanthemum. Among different fungicides tested, tebuconazole (0.1%) recorded lowest percent disease index (6.06) and highest flower yield (73.49 q/ha) followed by propiconazole (0.1%) and azoxystrobin (0.075%) (15.48 and 16.24 PDI and 59.56 and 58.32 q/ha, respectively). The PDI was highest (50.62) with lowest flower yield in control. (33.07q/ha). In other fungicides, PDI in the range of 26.66–31.10. The B: C ratio of tebuconazole, propiconazole and azoxystrobin was 5.55, 4.56 and 4.19, respectively. Disease index (6.06) and highest flower yield (73.49 q/ha) were noticed with tebuconazole (0.1%) followed by propiconazole (0.1%) and azoxystrobin (0.075%) (15.48 and 16.24 PDI and 59.56 and 58.32 q/ha, respectively). The PDI was highest (50.62) with lowest flower yield in control (33.07q/ha). The B: C ratio of tebuconazole, propiconazole and azoxystrobin was 5.55, 4.5 and 4.19 respectively.