Effect of Some Chemicals on Pseudomonas sp. Causing Bacterial Rot Disease of Orchids

Abstract

Nine chemicals, including five antibiotics: Agrimycin, Aureomycin, Septrin-S, Streptomycin, and Terramycin; and four fungicides : Coppercide, Copper sandoz, Cuprosan super D, and Trimitox forte were tested to evaluate inhibition effect on the growth of Pseudomonas sp., the causal bacterial rot disease of orchids, by Petridish zonal inhibition. The result indicated Septrin-S was the most effective. The bacteria was also inhibited by Aureomycin, Streptomycin, Trimitox forte and Terramycin, respectively. Aureomycin at 500 ppm and Terramycin at 1,000 ppm provided a good protection of bacterial infection in the green house.