Impact of Protective Sprays on Yield Loss Assessment due to Purple Blotch of Garlic Caused by Alternaria porri

Abstract

Field experiment with multiple treatments was conducted during rabi 2021-22 and 2022-23 on impact of protective sprays on yield loss assessment due to purple blotch of  garlic involved  combination of (azoxystrobin 11%+ tebuconazole 18% SC) applied at concentration of 0.15 %.Treatments with five sprays (T6), four sprays (T5) and three sprays (T4) showed considerable disease suppression, with AUDPC values of 1397.69, 1475.29 and 1543.83, respectively, translating to 61.86 per cent, 59.74 per cent and 57.82 per cent disease reduction over control. Plants treated with five sprays (T6) recorded highest plant height (40.98 cm), number of leaves per plant (7.59), cloves per bulb (20.10), clove weight (15.38 g), bulb weight (18.13 g), yield (73.68 q/ha), yield increase (41.67%) over control followed by plants treated with four sprays (T5)  recorded plant height (40.69 cm), number of leaves per plant (7.41), cloves per bulb (19.14), clove weight (15.10 g), bulb weight (17.38 g), yield (72.07 q/ha),  yield increase (38.57%) over control. Next best treatment was plants treated with three sprays (T4) recorded plant height (39.63 cm), number of leaves per plant (7.25), cloves per bulb (18.25), clove weight (13.75 g), bulb weight (16.25 g), yield (70.03 q/ha), yield increase (33.26%) over the control.