CHEMICAL CONTROL OF FIRE BLIGHT (ERWINIA AMYLOVORA) UNDER NATURAL AND ARTIFICIAL CONDITIONS

In 1990 under natural conditions pear trees (cv. Santa Maria) were sprayed during blooming and post blooming with the chemicals streptomycin, phosetyl-Al and flumequine. Streptomycin and flumequine gave the best results, followed by phosetyl-Al. In 1991 the conditions were unfavourable for the disease, so that even the control was not infected.

In 1990 and 1991 in the trials under artificial inoculations, the flowers of adult trees at 80% bloom of two pear orchards (cv. Krystalli and Santa Maria) were sprayed with a water suspension of Erwinia amylovora (1x10⁷ cfu/ml). Twenty four hours before (preventive) or 24 h after (curative) artificial inoculation, the flowers were sprayed with different chemicals. Streptomycin, oxonilic acid and flumequine gave significantly better results than copper compounds, phosetyl-Al, hexachlorophen and guazative triacetate.

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