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Pathogenicity and avoidable yield loss due to Meloidogyne incognita in French bean

KrishiKosh

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Title Pathogenicity and avoidable yield loss due to Meloidogyne incognita in French bean
 
Creator Mohapatra, Sagarika
 
Contributor Sahoo, S
 
Subject root knot Nematode, French bean, nematicide
 
Description The study was conducted to determine potential level of damage by root knot
nematode, Meloidogyne incognita in French bean c.v. contender. Fifteen days old seedlings
grown in sterilized earthen pots each containing one kg steam sterilized soil were inoculated
with 10,100,1000 and 10000 freshly hatched second stage Juveniles (J 2 ) of Meloidogyne
incognita. The experiment was terminated after 60 days of inoculation and observations were
recorded on plant growth characters and nematode multiplication. Findings revealed that an
inoculum level of 1000 and above J 2 / plant significantly decreased the plant growth
parameters. Nematode reproduction rate decreased with an increase in inoculum levels. It was
maximum (107.4 times) at inoculum level of 10 J 2 / plant and minimum (2.05 times) at 10000
J 2 / plant. Nematode population in soil and root increased progressively with an increase in
nematode inoculum level from 10 to 10000 J 2 / plant. Maximum population was recorded at
inoculum level of 10000 J 2 / plant followed by 1000 J 2 / plant which was statistically at par
with that of 10000 J 2 / plant. This clearly indicated that the threshold inoculum density of
M.incognita causing significant reduction of various growth parameters in French bean was
1000 J 2 per plant.The field experiment conducted in a root knot nematode sick plot by
growing French bean c.v. contender in pair plot design showed 18.77 % avoidable yield loss
due to M.incognita. Significant differences were observed in plant heights, fresh and dry
weights of plants between nematicidal treated and untreated plots. The treatment with
nematicide resulted reduction in final nematode population i.e., 69.55% in soil, 73.27% on
root and 45.00% decrease in root knot index.
 
Date 2017-01-04T12:24:05Z
2017-01-04T12:24:05Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/94388
 
Language en
 
Relation Th;4509
 
Format application/pdf