STUDIES ON STIMULATED EFFECT OF ORGANIC AMENDMENTS IN SOIL ON BIO-CONTROL POTENTIAL OF NEMATODETRAPPING FUNGUS Drechslerella brochopaga DRECHSLER.
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Date
2024-09-19
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DEPARTMENT OF PLANT PATHOLOGY COLLEGE OF AGRICULTURE BANDA UNIVERSITY OF AGRICULTURE & TECHNOLOGY BANDA-210001, UTTAR PRADESH (INDIA)
Abstract
Drechslerella brochopaga Drechsler was isolated from the soil of the Banda district and
characterized by using the relevant literatures. D. brochopaga was found to capture and
parasitize the nematodes by using constricting ring. In vitro efficacy test of D. brochopaga
against M.inognita resulted in the formation of traps that subsequently capture and kill the M.
incognita. Maximum trap formation (24.5) and trapping of M. incognita (J2) (98.60%) were
observed in D. brochopaga after 96hours of inoculation. The germination and carnivorous
ability of D. brochopaga in different soil of farms of Banda University of Agriculture and
Technology, Banda was be tested. D. brochopaga showed inhibitory effect of soil fungistasis
on germination (0.00-28.55%) but formed frequent conidial trap in vicinity of soil (61.66-
97.17%). Trapping of free-living nematodes was also observed by the conidial trap of D.
brochopaga. Application of neem cake at the concentration of 0.5%, 1% showed no toxic
effect on germination on conidia of D. brochopaga, but at concentration of 2%, 3%, 5% neem
cake completely inhibited the germination of spores of D. brochopaga after 24 h of
amendment. The inhibitory effect of neem cake was reduced after 15 days of amendment,
while after 30 days after amendment the inhibitory effect was completely lost, and the spore
germinated by conidial trap as in unamended soil. Amendment of soil with Rabbitdung, Cow
dung showed no toxic effect on conidial trap formation. It has been observed that the
population of saprophytic nematodes increases several folds after neemcake, rabbit dung, cow
dungamendment, which can serve as pabulum for the fungus and increase the population of D.
brochopaga. The best temperature for growth and CT formation of D. brochopaga was
observed at 25ÂșC. Bio efficacy test of D.brochopaga with organic amendment in root-knot
infested soil resulted in the reduction of number of root-knot (67.17-80.33%) and second stage
juvenile of M. incognita (71.26-86.08%) by D.brochopaga. The efficacy of D.brochopaga
against M. incognita was enhanced when the fungus was applied with neem cake manure
amended soil. The result of research carried out under the thesis indicates that D. brochopaga
was potential nematode-trapper and well adoptive in soil of Banda.
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YOGENDRA. (2024) STUDIES ON STIMULATED EFFECT OF ORGANIC AMENDMENTS IN SOIL ON BIO-CONTROL POTENTIAL OF NEMATODETRAPPING FUNGUS Drechslerella brochopaga DRECHSLER.[Thesis, M.Sc; DEPARTMENT OF PLANT PATHOLOGY COLLEGE OF AGRICULTURE BANDA UNIVERSITY OF AGRICULTURE & TECHNOLOGY BANDA-210001, UTTAR PRADESH (INDIA) ]