Decrease of Venturia inaequalis (Cook) Aderh. sensitivity to dodine and sterol demethylation inhibitor fungicides

https://doi.org/10.17221/10584-PPSCitation:Meszka B., Bielenin A. (2002): Decrease of Venturia inaequalis (Cook) Aderh. sensitivity to dodine and sterol demethylation inhibitor fungicides. Plant Protect. Sci., 38: 659-661.
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The effectiveness of fenarimol and difeconazole, DMIs fungicides, and dodine was tested in two experimental orchards and in greenhouse in two seasons. In 2001 monitoring of resistance to dodine was conducted also in some commercial orchards located in main apple production. In both experimental orchards fenarimol gave significantly poorer control of apple scab than difenoconazole when curative treatments were applied. The same results were obtained in greenhouse tests using for inoculation the suspension of conidia of V. inaequalis from these orchards. In many monitored orchards, in each region, a high level of dodine resistant isolates in population of V. inaequalis (even more than 40%) was noted. Only in six from 65 tested orchards there was less than 1% resistant isolates in population of the fungus.
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