ISHS Acta Horticulturae 273: V International Workshop on Fireblight
ON THE EFFECT OF PLANT EXTRACTS AGAINST FIREBLIGHT (ERWININA AMYLOVORA) |
| Authors: | J. Mosch, F. Klingauf, W. Zeller |
| Abstract:
First studies on the efficacy of plant extracts against the fireblight pathogen Erwinia amylovora were undertaken under in vitro- and in vivo conditions. In agar diffusion test 24 plant extracts out of 131 samples gave an inhibitory effect against the pathogen. The inhibitory potential of three extracts from Juglans nigra L., Berberis vulgaris L. and Rhus typhina L. applied as aqueous solution in 5, 2 and 1.25 % was even comparable with Streptomycin (17 ppm). Under field conditions 3 of these effective extracts from B. vulgaris, R. typhina, M. aquifolium and one from Allium sativum showed in prophylactic sprayments against blossom blight on Cotoneaster salicifolius var. floccosus a significant control up to 53 %, but were usually less efficient than the bactericides Streptomycin (100 ppm) and copperoxychloride (1%) used for comparison. From two plant extracts a possible resistance induction effect is discussed. | |
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