EVALUATION OF SPANISH TYPE GROUNDNUTS FOR RESISTANCE TO STEM-AND POD-ROT CAUSED BY Sclerotium rolfsii Sacc.
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Date
1999-08-30
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
SderotiuTn rolfsii incited stem and pod rots is a major constraint to groundnut
productioa in many groundnut growing regions of India, Though considerable research
has been carried out on the management of the disease, information on the reaction of
the currently grown Spanish type cultivars to the fungus in India is larlring
Evaluation of 13 genotypes along with resistant (ICGV 86590 and GBFDS 272)
checks under artificially inoculated conditions indicated significant difference among
genotypes and seasons as well as genotype x season interaction for disease, yield and
yield related parameters. M^'ority of ruling Spanish type cultivars of Karaataka (TMV 2,
JL 24, Dh 40, KRG 1 and R 8808), two germplasm lines (ICG 5125 and ICG 5247) and
three leaf spot resistant Spanish mutants {VLl-28-2, VLl-45 and VLl-llO) were
susceptibie, while a released cultivar Dh 8 was comparable or superior to the resistant
checks.
To assess the scope for selection in hybrid populations, two crosses were
generated using JL 24, a popular but susceptible Spanish type cultivar and Dh 8, a
resistant but deficient in shelling outturn and hundred seed mass. The crosses
exhibited significant variability for all characters and it was highly heritable for disease
inadence and yield per unit area. The fi^quency of superior sregants were high for
disease resistance (48%), but low for shelling outturn (7%) and hundred seed mass
(11 %) leading to recovery of very few desirable lines.
None of the genotypes tested in the present study was completely resistant.
Other controal measures (cultural, chemical and biological) when applied individually
are known to be incompletely effective, necessitating integration of different approaches
to achieve effective control of the pathogen. Drastic reduction and complete control of
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