Management of Downy Mildew of Onion Through Selective Fungicides in the Field Condition

Abstract

Efficacy of various fungicides against powdery mildew of onion all chemical treated 1st, 2nd, 3rd and 4th observation Score observation in plants (out of 15) were 0.97, 2.89, 2.44 and 2.22 against 2.33, 9.00, 10.00 and 10.33 in control; disease infection 6.47, 20.00, 16.30 and 14.07% against 15.56, 60.00, 66.67 and 68.89% in control; infected leaves/plant 0.20, 2.04, 2.38 and 2.02 against 1.04, 4.36, 4.99 and 4.04 leaves in control, respectively. The Cabriotop observation resulted in infected plants 1.00, 2.56, 1.89 and 1.67 against 2.32, 9.00, 10.00 and 10.33 in control; disease infection 6.67, 17.04, 12.59 and 11.11 against 15.56, 60.00, 66.67 and 68.89% in control, infected leaves 0.41, 2.22, 2.62 and 2.07 against 1.04, 4.36, 4.99 and 4.04 in control, respectively with average bulb weight of 126.50g.The Relly observation in infected plants 0.96, 3.33, 2.78 and 3.11 against 2.33, 9.00, 10.00 and 10.33 in control; disease infection 6.42, 22.22, 18.52 and 20.74% against 15.56, 60.00, 66.67 and 68.89% in control; infected leaves 0.41, 2.22, 2.62 and 2.07 against 1.04, 4.36, 4.99 and 4.04 in control, respectively with average bulb weight of 116.38g against 74.34g in control. Defer plus at observation resulted in infected plants of 0.95, 2.78, 2.56 and 2.78  against 2.33, 9.00, 10.00 and 10.33 in control; disease infection 6.33, 18.52, 17.04 and 18.52% against 15.56, 60.00, 66.67 and 68.89% in control; infected leaves 0.50, 2.10, 2.48 and 1.96 against 1.04, 4.36, 4.99 and 4.04/plant in control; with average bulb weight of 101.63g, 106.97g and 112.61g overall average bulb weight of 107.07g against 74.34g bulb weight on average in control