STATUS OF PLANT PARASITIC NEMATODES IN CROPS UNDER PROTECTED CULTIVATION IN HIMACHAL PRADESH AND THEIR MANAGEMENT IN ROSE
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Date
2019-11
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UHF,NAUNI
Abstract
ABSTRACT
The research work entitled “Status of plant parasitic nematodes in crops under protected
cultivation in Himachal Pradesh and their management in rose” was undertaken to ascertain the status of
plant parasitic nematodes in the state of Himachal Pradesh and explore the possibilities of nematode
management in rose, a highly nematode infested crop grown in mid-hill region of Himachal Pradesh, by using
different nematode management practices. Faunistic presence of plant parasitic nematodes with prominence on
species of different nematodes was conducted by collecting 281 soil samples from the vegetations covering all
the districts of Himachal Pradesh. Samples, when analysed in laboratory revealed the nematode genera viz.,
Meloidogyne incognita, Helicotylenchus dihystera, Pratylenchus coffeae and Hoplolaimus indicus in all the
districts irrespective of climate conditions and altitude. Of these, M. incognita was found to be the most
predominant. Four major genera of plant parasitic nematodes were identified from different host crops based on
their morphological characters, perineal patterns of the female and morphometric measurements. The effect of
four different inoculum levels of root-knot nematode on eight varieties of rose viz., Yellow Miniature, Iceberg,
Keyene Lijipet, Tajmahal, Gold Master Piece, Ashwani, A-1 and Gold Strike revealed a significant increase in
soil population of nematodes and decrease in growth parameters as an increase in inoculum levels. Of these,
eight varieties screened against root-knot nematode, two varieties were found to be highly susceptible, five
varieties were found to be susceptible and one variety was found to be moderately resistant. Among all the
treatments and their combinations, neem formulation 1ml/l + dazomet @ 40 g/m2 application in the polyhouse
as well as in the open field was most effective in reducing nematode population as well as increasing growth
parameters and yield. This treatment was followed by the treatments of carbosulfan @ 500 ppm+ dazomet @ 40
g/ m2 that was statistically at par with the yields obtained from dazomet. The plots that did not receive any
treatment, suffered maximum losses in terms of yield as well as plant vigour. It can be concluded from the study
that dazomet is effective in reducing M. incognita population and root gall index in rose. However, its efficacy
can be enhanced by adding neem or mustard cake that accelerates the plant growth parameters in case of rose.
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