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STUDIES ON ACQUIRED FUNGICIDE TOLERANCE IN Pyricularia oryzae Cav AND Gloeosporium ampelophagum Pass

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Title STUDIES ON ACQUIRED FUNGICIDE TOLERANCE IN Pyricularia oryzae Cav AND Gloeosporium ampelophagum Pass
 
Creator SWARNALATA, TARUGULA
 
Contributor SUGUNAKAR REDDY, M
 
Subject STUDIES , ACQUIRED, FUNGICIDE, TOLERANCE, Pyricularia,oryzae,
 
Description Pyricularia oryzae Cav. and Gloeosporium.
ampelophagum Pass. were trained to tolerate increasing
amounts of fungicides. Cross-tolerance of the fungicide
tolerant isolates obtained, were tested against various
other fungicides. The persistent and non-persistent
nature of the fungicide tolerant isolates was also
studied.P. oryzae acquired 20-fold (10 to 200 pg/ml)
tolerance to edifenphos and 5-fold ( 1 to 5 pg/ml)
tolerance to mancozeb when trained for eleven successive
subculturings in media containing increasing
concentrations of these fungicides.
G. ampelophagum, when trained for nine
successive subculturings in increasing concentrations of
carbendazim, developed 5000-fold ( 1 to 5000 pg/ml)
tolerance to carbendazim while in captafol the initial
tolerance of 5 pg/ml was reduced to 2 )lg/ml at the
end of nin . .. th subculturing.
In cross-tolerance studies, edifenphos
tolerant isolate of Pyricularia oryzae exhibited positive
cross-tolerance to mancozeb, and to the combination of
edifenphos + mancozeb and negative cross-tolerance to
carbendazim, while the tolerance was unaffected to
captafol and copper oxychloride.
Mancozeb tolerant isolate of P. oryz~ showed
positive cross-tolerance to edifenphos and to the
combination of edifenphos + mancozeb, and it was
negatively correlated to captafol, carbendazim and
copper oxychloride.
Carbendazim tolerant isolate of Gloeosporium
ampelophagum was positively correlated for its tolerance
to the combination of carbendazim + captafol, copper
oxychloride and mancozeb, while the tolerance to
captafol was unaffected.
Captafol trained isolate of G. ampelophagum
exhibited positive cross-tolerance to carbendazim,
combination of carbendazim + captafol, copper
oxychloride and mancozeb.
XX
Edifenphos tolerant isolate of P. _£Eyzae
retained its acquired tolerance, while mancozeb tolerant
isolate lost its acquired tolerance when grown in
fungicide-free media for three subculturings.
Carbendazim tolerant isolate in G.
ampelophagum retained its acquired tolerance, while
captafol trained isolate lost the acquired tolerance to
some degree when grown for three subculturings in
fungicide free media.
Not much difference in tolerance levels of
different isolates of P. oryzae and G. ampelophagum
obtained from different places was observed when tested
against various fungicides in spore germination studies.
 
Date 2016-08-06T14:55:52Z
2016-08-06T14:55:52Z
1989
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71302
 
Language en
 
Relation D3126;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD