EXPERIENCE WITH CHEMICALS AGAINST ERWINIA AMYLOVORA

The efficacy against artificial inoculation with E. amylovora of 3 different copper compounds, 3 experimental bactericides, 7 fungicides of pome fruit culture, 4 disinfectants and 2 quinolate compounds were tested on Cotoneaster spp., pear and quince.

In the preventive trials on flowering plants the 3 copper products were equally active.
Two new bactericides reached the level of streptomycin, the other was somewhat inferior.
The bactericidal side-effect of the fungicides was negligible.
The disinfectants and quinoline compounds were ineffective.
The curative action against flower infection of the 2 bactericides tested, varied with the test plant.

The four bactericides used showed preventive action against shoot inoculation, but no curative control.

There was a small noteworthy influence of the inoculum density of the inoculated bacterium on the control level.

The opportunity of allowing new products for fireblight control was discussed.

II Symposium on Fire Blight

T. Kooistra, J.J.J. Langeslag

https://doi.org/10.17660/ActaHortic.1981.117.16