Vol. 11, Issue 2 (2022)

Author(s):
Dinesh Kumar, SL Godara, AK Meena and BDS Nathawat

Abstract:
A field experiment was carried out to the evaluate theeffect of different fungicideon purple blotch [Alternaria porri (Ellis) Cif] of onion (Allium cepa L.) experimental farm during Rabi 2015-16 and 2016-17 in the Department of Plant Pathology, College of Agriculture, Swami Keshwanand Rajasthan Agricultural University, Bikaner. The experiment was laid-out in randomized block design with three replications. The effective management of purple blotch of onion through the application of different fungicides was appraised under field condition. Among the nine treatment evaluated, the seed treatment (ST) with Tebuconazole @ 1g/kg + two spray Tebuconazole @ 0.1% recorded significantly minimum percent disease index of 17.75% and bulb yield 26.83 t/ha which was superior over other treatment and control. However, the result shows that the application of tebuconazole was inhibited completely the mycelial growth of Alternaria porri at 100 and 200 ppm concentrations and Azadirachtaindica (Neem leaf extract)was found least effective at all concentrations against Alternaria porri. Moreover, the ST with Difenoconazole @ 1g/kg + two spray of Difenoconazole @ 0.1% (PDI 29.03% and Bulb yield 22.60 t/ha) recorded second best but it found statically at par with the application of ST with Tebuconazole + Trifloxystrobin @ 0.5g/kg + two spray Tebuconazole + Trifloxystrobin @ 0.05% (PDI 32.87% and Bulb yield 22.33 t/ha) and ST with Propiconazole @ 1g/kg + two spray of Propiconazole @ 0.1% (PDI 33.83% and Bulb yield 21.97 t/ha) in pooled analysis, respectively. The control was recorded higher PDI (74.00%) and minimum bulb yield (5.03 t/ha). The observation of this field is very useful to effective control of purple blotch disease of onion and in-vitro technique the different fungicide efficiently inhibits the per cent myceial growth.