ISHS Acta Horticulturae 704: X International Workshop on Fireblight
GROWTH-REGULATING ACYLCYCLOHEXANEDIONES, TRINEXAPAC-ETHYL AND PROHEXADIONE-CALCIUM DECREASE BLOSSOM BLIGHT INCIDENCE IN POME FRUITS |
| Authors: | F. Spinelli, G. Costa, J.L. Vanneste, D.A. Cornish, J. Yu |
| Keywords: | fire blight, Erwinia amylovora, biological control, Pantoea agglomerans, Malus domestica, Pyrus communis |
| Abstract:
The growth-regulating acylcyclohexanediones, trinexapac-ethyl and prohexadione-calcium reduced fire blight infection on apple and pear flowers inoculated with Erwinia amylovora. A reduction of up to 50% of blossom blight was observed in treated plants. In addition, treatment with one of these compounds significantly reduced the percentage of flower infections that successively developed into shoot blight. The acylcyclohexanediones have also been combined with a biological control agent: Pantoea agglomerans EhC9-1. Treatments with such a combination resulted in 75% less flower infections developing into shoot blight than when treated with water. This level of reduction was higher than that observed for either EhC9-1 or an acylcyclohexanedione by itself. This synergic effect could be the result of combining complementary modes of action. | |
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