Bioecology and management of root knot nematode, Meloidogyne incognita infecting mungbean
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Date
2018-08
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OUAT
Abstract
Mungbean (Vigna radiata L.) is an important pulse crop of India constrained by
several diseases resulting in losses in quality and quantity. Root knot nematode,
Meloidogyne incognita very often results in severe losses in mungbean crop in different
parts of the Odisha state.
Experiments demonstrated the symptoms stunting, chlorosis, drying of leaf tips
and margins with numerous galls in the roots of mungbean infected by M. incognita. It
induced 3-7 poly nucleated giant cells inside the vascular parenchyma which served as
metabolic sinks to sequester nutrient demand of the developing nematode accompanied
by disruption of vascular tissues, hypertrophied cortical cells and hyperplastic pericycle
cells leading to typical gall formation in the roots of mungbean.
The life cycle was completed in 28 days in mungbean with an ambient mean
temperature ranging between 27.6 to 28.10C.
The damaging threshold level of M. incognita in mungbean cultivar Dhauli
was determined @100j2/kg soil.
The avoidable yield loss in mungbean CV, Dhauli by M. incognita in a naturally
infested field was estimated to be 35.39 per cent.
The population densities of M. incognita in paddy-mungbean cropping
sequences varied greatly in different parts of the year depending upon the crop and
fallow periods. Highest population was recorded during pick period of growth of
mungbean and the lowest during fallow.
OBGG-52 and OBGG-194 with a mean root knot index ranging between 1.66
to2.0 exhibited resistant reaction. Cultivars De local and T-43-1-5 exhibited highly
resistant response with a mean root knot index ranging between1.0 to 1.33.
Soil application of carbofuran 3G @ 0.75kg a.i/ha+ seed treatment with
Trichoderma harzianum@ 10g/kg seed was the best cost effective integrated
management module for M. incognita infecting mungbean.
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