STUDIES ON CERTAIN ASPECTS OF KALAHASTI MALADY OF GROUNDNUT
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Title |
STUDIES ON CERTAIN ASPECTS OF KALAHASTI MALADY OF GROUNDNUT
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Creator |
RATNA KUMAR, G
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Contributor |
MANI, A
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Subject |
STUDIES, CERTAIN, ASPECTS, KALAHASTI ,MALADY, GROUNDNUT,
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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. |
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Date |
2016-08-06T11:49:42Z
2016-08-06T11:49:42Z 1988 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/71208
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Language |
en
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Relation |
D3092;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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