ISHS Acta Horticulturae 273: V International Workshop on Fireblight
PRELIMINARY EVALUATION OF CHEMICALS EFFICACY AGAINST FIRE BLIGHT |
| Authors: | P. Sobiczewski, S. Berczynski |
| Abstract:
The protective activity of 27 chemicals for the control of fire blight was evaluated in 1986–1988 by the method using pear fruitlets cv. Conference. The experiments were done at 24°C, 100% humidity and a high infection pressure. The obtained results indicate the best activity of experimental chemical S-0208 (Sumitomo, Japan) at a concentration of 0,3%. This preparation almost completely protected fruitlets against infection and the development of disease. Agri-mycin 17 (Pfizer, USA) showed also satisfactory efficacy. In general, copper preparations (Miedzian 50, Poland and Champion WP, Agtrol, USA) were quite effective, especially in a concentration of 0,5%. However, they caused some phytotoxicity effect which was revealed by slight russeting of the fruitlets. The other chemicals (Albarep, Bronopol and experimentals) were ineffective. | |
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