CHEMICAL CONTROL OF ERWINIA AMYLOVORA UNDER ARTIFICIAL AND NATURAL CONDITIONS

Tsj. Kooistra, J. de Gruyter
Chemical control experiments under artificial and natural infection conditions were carried out on flowering Cotoneaster spp. and pear as test plants. The efficacy of the antibiotica Plantomycin and Kasumin was distinctly influenced by the density of the artificially applied inoculum of Erwinia amylovora. Control at 106 cells/ml was sufficient, at 108 cells/ml poor. The activity of two copper compounds (Copac E and Koper Bayer) was determined exclusively by the Cu content of the treatment and not by the compound.

Under artificial conditions the curative action of Kasumin seemed to be better than of Plantomycin.

The copper product Tri-Miltox forte NC and MBR 10995 showed a promising preventive action against artificial flower infection.

In trials under natural infection conditions on pear or C. salicifolius floccosus, repeated treatments with Plantomycin, Koper Bayer, Kasumin and Tri-Miltox forte NC gave sufficient control of flower infection. CGA 78039 and Copac E were not effective.

Kooistra, Tsj. and de Gruyter, J. (1984). CHEMICAL CONTROL OF ERWINIA AMYLOVORA UNDER ARTIFICIAL AND NATURAL CONDITIONS. Acta Hortic. 151, 223-232
DOI: 10.17660/ActaHortic.1984.151.29
https://doi.org/10.17660/ActaHortic.1984.151.29

Acta Horticulturae