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Resistance of <i>Venturia inaequalis</i> to quinone outside inhibitor (QoI) fungicides in New Zealand apple orchards
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DNA sequencing and optimisation of allelespecific primers targeting the G143A mutation which confers resistance in Venturia inaequalis (apple black spot) to quinone outside inhibitor (QoI) fungicides was used to develop a resistance testing method for orchard surveys The method confirmed the resistance status of 15 V inaequalis isolates that were classified as sensitive or resistant to trifloxystrobin using a mycelial growth assay Disease caused by four isolates carrying the G143A mutation was not controlled by the QoI fungicide trifloxystrobin in an inoculated potted tree experiment In a survey of 41 apple orchards in Hawkes Bay Nelson Otago and Waikato during 201112 the G143A mutation occurred in 54 of 802 V inaequalis isolates and 59 of orchards had more than 50 of isolates with the mutation present The results indicate that orchards with a high G143A mutation frequency can be expected to experience loss of black spot control where QoI fungicides are used
New Zealand Plant Protection Society
Title: Resistance of <i>Venturia inaequalis</i> to quinone outside inhibitor (QoI) fungicides in New Zealand apple orchards
Description:
DNA sequencing and optimisation of allelespecific primers targeting the G143A mutation which confers resistance in Venturia inaequalis (apple black spot) to quinone outside inhibitor (QoI) fungicides was used to develop a resistance testing method for orchard surveys The method confirmed the resistance status of 15 V inaequalis isolates that were classified as sensitive or resistant to trifloxystrobin using a mycelial growth assay Disease caused by four isolates carrying the G143A mutation was not controlled by the QoI fungicide trifloxystrobin in an inoculated potted tree experiment In a survey of 41 apple orchards in Hawkes Bay Nelson Otago and Waikato during 201112 the G143A mutation occurred in 54 of 802 V inaequalis isolates and 59 of orchards had more than 50 of isolates with the mutation present The results indicate that orchards with a high G143A mutation frequency can be expected to experience loss of black spot control where QoI fungicides are used.
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