Loss Assessment and Integrated Management of Leaf Blight of Sweet Sorghum Caused by Exserohilum turcicum (Pass.) Leonard and Suggs.
Loading...
Date
2018-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences, Dharwad
Abstract
Field experiment on loss assessment was conducted at the Main Agricultural
Research Station, UAS, Dharwad, during kharif 2017 in randomized complete block
design with three replications and seven treatments involving the different number of
sprays with hexaconazole (0.1 %) at weekly intervals.
The results revealed, loss in the fodder yield to the extent of 37.20 per cent and
reduction in sucrose content (21.17 %), crude fibre content (9.64 %), leaf ash content
(62.91 %) and crude protein (13.00 %) was observed at the PDI of 67.40.
Epidemiological study indicated significantly positive correlation with morning
and evening relative humidity, rainfall and number of rainy days without any
association with maximum and minimum temperature. Grain sorghum, bajra, foxtail
millet and Johnson grass expressed the symptoms of leaf blight under artificial
inoculation with E. turcicum. However, grain sorghum and Johnson grass showed the
symptoms under natural conditions also.
In vitro studies revealed, hexaconazole 5 EC at 0.1 per cent (100%),
multineemore at 0.5 per cent (67.50 %) recorded maximum inhibition of mycelial
growth and consortium of three bioagents, Trichoderma harzianum + Pseudomonas
fluorescens + Bacillus subtilis at 3.3 g each/l and panchagavya at 5 per cent inhibited
80.44 and 19.50 per cent spore germination, respectively. In integrated management
spray schedule under filed condition, hexaconazole at 0.1 per cent - hexaconazole at
0.1 per cent - hexaconazole at 0.1 per cent effectively reduced the severity of leaf blight
(PDI-26.54, AUDPC-542.29) and increased the fodder yield (40.35 t ha-1) and sucrose
content (12.42 %) with highest BC ratio (1:1.42) followed by hexaconazole at
0.1 per cent - multinemor at 0.5 per cent - hexaconazole at 0.1 per cent, which has
recorded the PDI and AUDPC of 29.51 and 626.84, respectively with fodder yield and
brix value of 37.96 t ha-1 and 11.15 per cent, respectively.