Arecanut (Areca catechu L) is a most important profitable plantation crop cultivated in humid tropics of India. Fruit rot caused by Phytophthora meadii is a major constraint in arecanut production causing heavy economic yield loss or death of the arecanut palm itself. During 2015-16, 2016-17 and 2017-18 an investigation with Bordeaux mixture and stabilized Blue Bordo both at 1.0, 1.5, 2.0 and 2.5 per cent, respectively along with control was conducted at Panatha, Megaravalli located in Malnad region of Karnataka. The average annual rainfall of this place during the experimental period was 3052.80 mm. The results revealed that the number of healthy bunches (3.05), lowest number of infected bunches (1.05), lowest number of fallen nuts (15.92), lowest number of infected nuts (12.10), lowest weight of fallen nuts (143.15g) and highest green nut weight (14.12 kg) per palm were recorded with the treatment Bordeaux mixture 1.0 %. Lowest number of healthy bunches (2.59), highest number of fallen nuts (33.41), highest number of infected nuts (30.10), highest weight of fallen nuts (366.78g) and lowest green nut weight per palm (10.46 kg) were recorded with the untreated control.