STUDIES ON ACQUIRED FUNGICIDE TOLERANCE IN Pyricularia oryzae Cav AND Gloeosporium ampelophagum Pass
KrishiKosh
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Title |
STUDIES ON ACQUIRED FUNGICIDE TOLERANCE IN Pyricularia oryzae Cav AND Gloeosporium ampelophagum Pass
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Creator |
SWARNALATA, TARUGULA
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Contributor |
SUGUNAKAR REDDY, M
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Subject |
STUDIES , ACQUIRED, FUNGICIDE, TOLERANCE, Pyricularia,oryzae,
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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. |
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Date |
2016-08-06T14:55:52Z
2016-08-06T14:55:52Z 1989 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/71302
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Language |
en
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Relation |
D3126;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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