Effect of Experimental Bactericides on Three Bacterial Diseases of Foliage Plants

Several experimental bactericides were compared with standard bactericides for efficacy on several floral and foliage crops: Erwinia chrysanthemi on Philodendron selloum, Xanthomonas campestris pv. hedera on Brassaia actinophylla and Hedera helix, and Pseudomonas cichorii on Chrysanthemum morifolium and B. actinophylla. Compounds tested were Kocide 101 77WP (cupric hydroxide) alone and in combination with Manzate 200 80WP (mancozeb), Ciba Geigy experimental compounds 448, 115944 and 151731, and Agri-Strep 1721.2% (streptomycin sulfate). In the majority of trials, compound 115944 provided disease control equivalent to that achieved with streptomycin sulfate. Disease control following application of 151731 was variable, while treatment with compound 448 resulted in poor control. Moderate disease control was achieved with cupric hydroxide applied alone or with mancozeb for Erwinia blight or Xanthomonas leaf spot.