In vitro Efficacy of Fungicides against Phomopsis vexans Inciting Phomopsis Blight of Brinjal

Abstract

Phomopsis blight is an important disease of brinjal inflecting heavy losses. The present investigation was carried out to test the in vitro efficacy of fungicides against Phomopsis vexans causing Phomopsis blight of brinjal using Poison Food Technique. All seven systemic fungicides tested at 500 and 1000 ppm concentration were significant in recording minimum mycelial growth and maximum inhibition of Phomopsis vexans over the untreated control. Among systemic fungicides, Propiconazole 25 % EC showed maximum per cent inhibition of pathogen followed by Hexaconazole 5% EC, Carbendazim 50 % WP, Difenconazole 25 % EC, Azoxystrobin 23 % SC, Thiophanate methyl 70 % WP and Metalaxyl 35 % WS at all tested concentration. All seven contact and combi product fungicides tested at 2000 and 2500 ppm concentration were significant in recording minimum mycelial growth and maximum inhibition of test pathogen over the untreated control. Among seven contact and combi fungicides, complete inhibition of mycelial growth was achieved with Carboxin 37.5 % +Thiram 37.5 % WP, Carbendazim 12 % + Mancozeb 63 % WP and Tebuconazole 50 % + Trifloxystrobin 25 % WP. Rest of fungicide viz., Pyraclostrobin 13.3 % + Epoxiconazole 5 % SE, Mancozeb 75 % WP, Propineb 70 % WP and Chlorothalonil 75 % WP were also effective in recording least mycelial growth of test pathogen over the control.