TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Microbes: The Streptomyces are Streptomyces scabies, Streptomyces turgidiscabies and Streptomyces ipomoeae. ACTIVITY - Plant antibacterial. Bacillus polymixa NT-104 was cultivated in peptone-glucose culture medium, for 3 days at 28 degrees C, and a colony of Bacillus polymixa NT-104 was obtained. The colony was added with bark compost and wheat bran which were mixed in a weight ratio of 9:1. The colony of Bacillus polymixa NT-104 autoclaved for 30 minutes at 121 degrees C, and a mixture of Bacillus polymixa NT-104 of 105-106 colony forming unit (CFU)/g was obtained. Further, the microbe was inoculated for 7 days at 28 degrees C, and material which contained Bacillus polymixa NT-104 of 108 CFU/g was produced. The obtained material was added to soil surface for fixed-planting of the seed of potato. After 3 months, the new tuber of the potato was removed from the earth, and the generation of scab in the potato was evaluated. The results showed that the degree of disease onset of the scab on the surface of the potato was 10.7%, and the control value of the scab was 60.2% which was much higher, when compared with the potato cultivated in the soil not added with Bacillus polymixa NT-104. The results showed that the Bacillus polymixa NT-104 enabled a decrease of disease onset of scab in the potato, and was effective in controlling the scab.    MECHANISM OF ACTION - None given in the source material.    SPECIFIC COMPOUNDS - The Bacillus polymixa is especially Bacillus polymixa NT-104 (FERM P-17822), and Bacillus subtilis is especially Bacillus subtilis NT-107 (FERM P-17823).    EXAMPLE - Bacillus polymixa NT-104 was cultivated in standard agar medium for 3 days at 28 degrees C, and a colony of Bacillus polymixa NT-104 was obtained. 100 ml of water was added to 100 g of soil, heat-processed for 20 minutes at 121 degrees C, filtered, and soil hot water extract was obtained. Potassium dihydrogen phosphate (0.2 g) and 15.0 g of agar was added to 100 ml of the obtained extract, and heat-processed for 20 minutes at 121 degrees C. Then, 15 ml each of the obtained solution was injected into Petri dish with diameter of 8 cm, cooled, and flat plate culture medium was prepared. One platinum-loop spot inoculation of the colony of Bacillus polymixa NT-104 was performed in the center of the flat plate culture medium, and maintained for 24 hours at 28 degrees C. Then, the culture medium was uniformly sprayed with a suspension of the spore of Streptomyces scabies, and left for 7 days at 28 degrees C. The diameter of the inhibition circle when evaluated was found to be 8 mm. The results showed that Bacillus polymixa NT-104 efficiently inhibited Streptomyces scabies.