|Authors: ||J. Mosch, W. Zeller|
|Keywords: ||Biological Control, Erwinia amylovora, plant extracts, resistance induction|
Following treatment of different fire blight hosts with three plant extracts from ivy (Hedera helix), willow (Salix alba) and Bryonia dioica under greenhouse and field conditions a marked reduction in disease development compared to infected control could be observed.
In the greenhouse, following treatment of apple seedlings, a efficacy up to 80 % could be achieved.
In the field, on the apple varieties ‘James Grieve’, ‘Golden Delicious’ and the ornamental Cotoneaster salicifolius the efficacy of the extracts could be confirmed (43 – 68 % control). Further, in experiments with the most effective inductor Hedera helix on various apple varieties with different degree of susceptibility, the highest efficacy was found on the most resistant variety ‘Golden Delicious’ with a 57 % control in comparison to the highly susceptible ‘James Grieve’ with 43 %. We assume that the resistance inducing effect of the extracts obviously depends on the climatic conditions during the main infection time (bloom).
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