RELATIVE EFFICACY OF CHLOROTHALONIL FOR CONTROLLING LEAF-BLIGHT (COLLETOTRICHUM-GLOEOSPORIOIDES) OF SCENTED GERANIUM (PELARGONIUM, GRAVEOLENS)

A study was conducted during 1992-93 at Bangalore on the bioefficacy o f chlorothalonil for controlling leaf blight uf geranium (Pelargonium graveolens (L.) Herit.) caused by Colletotrichum gloeosporiodes Penz. the chlorothalonil sprayed plots effectively reduced the disease inten sity and gave on an average 242 and 192% greater yields of herbage and essential oil, respectively, compared with the unsprayed plots and it was at par with captafol sprayed plots in both the years. Chlorothalo nil though found effective: against Colletotrichum gloeosporiodes was not economical as captafol because of its higher cost.