INVESTIGATIONS ON ROOT-KNOT NEMATODE (Meloidogyne incognita) ASSOCIATED WITH BLACK GRAM (Vigna mungo L.)
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Date
2016-07-23
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Root-knot nematode (Meloidogyne incognita) is a serious pest of pulse crops and
is a major limiting factor in the production of black gram in many parts of the country,
including Karnataka. Use of chemicals to manage nematodes affects soil bio-diversity
and environment besides their residual toxicity. The present studies were undertaken to
survey for the occurrence of root-knot nematode in major pulse growing areas in southern
Karnataka districts, screening of available varieties/cultivars of black gram against rootknot
nematode and effect of root knot nematode on nodulation, growth and yield
parameter in black gram. In the field survey, predominant occurrence of total soil and
root population of M. incognita (657/200cc soil and 71/5g of root) followed by
Helicotylenchus sp.(70 and 15), Rotylenchulus sp. (30 and 28) and Pratylenchus sp. (22
and 17) were noticed in Chamarajanagar district followed by Tumkuru. Screening of
fourteen black gram cultivars viz., 2KU-60, ADT-05, BG-2, DU-1, G-333, IC-282007,
IC-436545, K-5-572, KU-8-155, LKU-64, RASHMI, RU10-601, SU-509 and UH-04-04
under glass house condition, revealed that UH-04-04 was more susceptible and G-333
was resistant to M. incognita. M. incognita infection significantly reduced the number of
rhizobial nodules, nitrogen content, root length, shoot length, pod number and plant
weight. A greater reduction was observed when the M. incognita was established before
the inoculation of the Rhizobium than the M. incognita and Rhizobium inoculated
together or when the Rhizobium was established before the inoculation of M. incognita.
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