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Studies on banded leaf and sheath blight of maize caused by Rhizoctonia solani f.sp. sasakii Exner

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Title Studies on banded leaf and sheath blight of maize caused by Rhizoctonia solani f.sp. sasakii Exner
 
Creator Mohan Lal
 
Contributor Mehra, Rakesh
 
Subject Maize, Banded leaf and sheath blight, Rhizoctonia. solani f. sp. sasakii, Epidemiology, Disease management, Host resistance, Plant extracts, Chemicals and Bio control
 
Description The studies on banded leaf and sheath blight of maize caused by Rhizoctonia. solani f. sp. sasakii
were conducted in the Department of Plant Pathology, CCS Haryana Agricultural University, Hisar and
CCSHAU, Regional Research Station, Karnal, during Kharif season of 2011. The experiments were laid
out in RBD in field and CRD in lab conditions. Banded leaf and sheath blight disease appears at pre
flowering stage on leaf and sheath in 40 to 45 days old plants. Out of three dates of sowing of maize, the
highest disease intensity was observed in I
st
date of sowing (29 June) followed by II
nd
date of sowing (13
July) and least disease intensity in III
rd
date of sowing (28 July). Maximum temperature range of (31.9-32.3
0
C), minimum (24.6-25
0
C) with relative humidity morning (94-95%) and evening (69-83%) , sun
shine (2-7.7hrs) per day and rainfall (34.6-55.8mm) were most congenial for disease progression.
Temperature and relative humidity plays important role in disease progression. Regression equations on
relationship between disease development and weather parameter have been developed for five maize
hybrids/inbreds. Out of one hundred inbred lines and sixty hybrids of maize screened against banded leaf
and sheath blight under field condition, eighteen inbreds and fourteen hybrids were found resistant.
Among six plant extracts evaluated against R. solani f. sp. sasakii, garlic clove and neem leaves extracts at
15 per cent concentration were found most effective both under in vitro and in vivo conditions. Out of
seven fungicides evaluated foliar sprays of propiconazole (0.1%) and validamycin (0.2%) provide
maximum disease control and also increase seed yield significantly. Stripping of the lower 2-3 leaf sheaths
found effective in checking the disease development. Bio agents, Trichoderma harzianum, T. viride,
Pseudomonas fluorescens and Bacillus subtilis also found effective both under in vitro and under pot
conditions
 
Date 2016-09-12T09:50:10Z
2016-09-12T09:50:10Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76384
 
Language en
 
Format application/pdf
 
Publisher CCSHAU