STUDIES ON BASELINE SENSITIVITY TO STEROL INHIBITOR AND STROBILURIN FUNGICIDES, AND MONITORING OF FUNGICIDE RESISTANCE IN Marssonina coronaria CAUSING PREMATURE LEAF FALL IN APPLE

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dc.contributor.advisorSHARMA, J.N.
dc.contributor.authorBHARDWAJ, AMBUJA
dc.date.accessioned2016-12-26T12:43:37Z
dc.date.available2016-12-26T12:43:37Z
dc.date.issued2012
dc.description.abstractABSTRACT Premature leaf fall is one of the most important diseases of apple particularly in Himachal Pradesh. Present studies were carried out with the objectives to establish baseline sensitivities of Marssonina coronaria to newly developed sterol inhibitor and strobilurin fungicides and to monitor the development of fungicide resistance in M. coronaria to some of the frequently used fungicides in apple orchards of Shimla district of Himachal Pradesh. The baseline sensitivities were established and observed in terms of mean EC50 values in vitro (spore germination in presence of different concentrations of test fungicides) against the wild isolate of M. coronaria. Baseline sensitivity of M. coronaria in terms of EC50 for flusilazole, hexaconazole and difenoconazole was 0.075, 0.027 and 0.031 mg/l, respectively. For strobilurin fungicides the mean EC50 value observed for azoxystrobin, kresoxim- methyl and pyraclostrobin were 0.053, 0.036 and 0.012 mg/l respectively. Five isolates from Shimla district in Himachal Pradesh (Theog, Kotgarh, Kotkhai, Rohru and Rampur) were selected to study development of resistance to dodine, mancozeb and carbendazim. The mean EC50 value for the entire test population of Marssonina coronaria observed was 0.038, 0.237 and 0.096 mg/l for dodine, mancozeb and carbendazim, respectively. The highest Mean Resistance Factor was observed for carbendazim, i.e. 2.48 followed by mean resistance factor for the dodine fungicide i.e. 1.56 and least mean resistance factor was observed for mancozeb at 1.15, thereby indicating no development of resistance in M. coronaria to the test fungicidesen_US
dc.identifier.other47887
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/92871
dc.language.isoenen_US
dc.subPlant Pathologyen_US
dc.subject---en_US
dc.subjectMarssonina coronaria,sterol inhibitor and strobilurin fungicides,apple orchardsen_US
dc.these.typeM.Sc
dc.titleSTUDIES ON BASELINE SENSITIVITY TO STEROL INHIBITOR AND STROBILURIN FUNGICIDES, AND MONITORING OF FUNGICIDE RESISTANCE IN Marssonina coronaria CAUSING PREMATURE LEAF FALL IN APPLEen_US
dc.typeThesisen_US
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