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STUDIES ON CERTAIN ASPECTS OF KALAHASTI MALADY OF GROUNDNUT

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Title STUDIES ON CERTAIN ASPECTS OF KALAHASTI MALADY OF GROUNDNUT
 
Creator RATNA KUMAR, G
 
Contributor MANI, A
 
Subject STUDIES, CERTAIN, ASPECTS, KALAHASTI ,MALADY, GROUNDNUT,
 
Description Survey of groundnut fields carried out in Chittoor
and Nellore districts of Andhra Pradesh revealed that in
general, the disease severity was higher in Chittoor than
in Nellore district and similarly, higher during rabi than
in kharif season. Among the 27 genera of plant parasitic
nematodes found associated with groundnut, Bitylenchus
brevilineatus recorded the highest prominence value
followed by Pratylenchus spp. and Hoplolaimus spp. both in
kharif and rabi season. Macroposthonia spp., Rotylenchulus
reniformis and Meloidogyne spp., were the other important
parasitic nematodes found associated with gr~undnut. Five
nematode genera, ~iz., Nothotylenchus spp., Basiria spp.,
Malenchus spp., Paratylenchus spp.,~nd Sakia spp., were
recorded for the first time from the rhizosphere of groundnut.
The relationship between the population of B.brevilineatus
and severity index of Kalahasti malady of groundnut
was not found relevant. Soil samples having 51-80 per cent
·sand and 11-30 per cent clay contents were found to be
suitable for development of disease as well as ~.brevilineatus.
Soil samples with pH range of 6.5-7.5 and E.C.
range of 0-0.8 m mhos/em were found optimum for the development
of disease as well as B.brevilineatus. Seed
treatment with thiram at 0.4 per cent recorded maximum
reduction (16.59 %) in disease incidence followed by
captan at 0.4 per cent (12.56 %) and carbofuran at 0.4
per cent (11 .43 %). Soil treatment with thiram@ 0.1
per cent reduced the incidence of Kalahasti malady to the
maximum extent of 72.0 per cent followed by captan (64.14%)
and carbofuran (58.16 %). It was observed that carbofuran,
aureofungin so~ and thiram were the most effective chemicals
in increasing the number of mature pods, 100-pod weight
and dry pod yield, though the order of efficacy slightly
changed with reference to dry pod yield. Out of four
hundred and eighteen groundnut germplasm accessions screened
against Kalahasti malady, 31 lines were highly resistant,
while 90 were resistant to the disease.
 
Date 2016-08-06T11:49:42Z
2016-08-06T11:49:42Z
1988
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71208
 
Language en
 
Relation D3092;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD