Articles
SOME RESULTS OF FIELD EXPERIMENTS ON THE CHEMICAL CONTROL OF FIRE BLIGHT
The main objective of the first years trials was to test the protective effect of known and new bactericides against artificial flower inoculation with Erwinia amylovora.
In one trial 2 years old flowering Cotoneaster dammeri "Coral Beauty" were used as testplants.
The products used were: copper oxychloride, streptomycin, Skane M 8 (a new compound) and ME 135 (a new compound), each in 2 or 3 concentrations.
After treatment the flower clusters were inoculated with E. amylovora.
Copper oxychloride gave the best results.
Streptomycin was far less active than copper oxychloride at the dosages used.
The two new compounds gave disappointing results.
In another small scale trial on flowering Cotoneaster salicifolius floccosus, copper oxychloride, streptomycin and the new compounds (in very high dosages) were applied.
Only ME 135 reached the protection level of copper oxychloride.
Skane M 8 did not show any activity at all.
Also the well known fungicides captafol and chlorothanonil were tested for their bactericidal effect on fireblight.
Captafol appeared to have a slight protective effect.