Bacterial and viral diseases of soybean: Effects of chemical seed treatments of soybean bacterial pustule on rhizobium nodule bacteria
1988
Sutruedee Prathuangwong | Chettaphan Choochae (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Seven chemical compounds including antibiotics and fungicides namely Aureomycin, Dumocycline, Agrimycin-100, Terramycin, Tersan 75, Thane M-45 and Cupravit used in seed treatment agnint bacterial pustule infecting soybean seeds were examined in affection Rhizobium nodule bacterial both under laboratory and field trials at Kasetsart University and Suwan Farm respectively. In laboratory, the chemicals at 250 ppm were shown to inhibit the growth of 5 strain of Rhizobium japanicum, namely USDA 8-10, USDA 15-7, USDA 110, USDA 122 and THA 7. An exception was found on Agrimycin-100 which inhibited the growth of strain THA 7 at above 1,500 ppm. In field test, seed treatment with 7 chemicals was conducted on bacterial pustule infected soybean varieties SJ2, SJ4 and SJ5 with and without inoculation of nodule bacterial. The results revealed no significant differences in fresh nodule weight, and 100-seed weight. Seeds treated with fungicide had differently significant in number of plants and yield from seeds treated with antibiotics and while all those seeds were also inoculated with antibiotics and while aoo those seeds were also inoculated with Rhizobium nodule bacteria before planting. However, seed of SJ4 inoculated with Rhizobium nodule bacteria were higher in yield than SJ4 seeds without inoculation of nodule bacteria.
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