Ecological studies on the bacterial blight of mulberry
IV. Resistance of Pseudomonas mori (BOYER et LAMBERT) STEVENS to some factors
1974 Volume 43 Issue 3 Pages 217-223
Details
1974 Volume 43 Issue 3 Pages 217-223
The effects of some physical factors on the growth and survival of Pseudomonas mori (BOYER at LAMBERT) STEVENS, the pathogen of bacterial blight of mulberry, were studied. The results obtained were summarized as follows
(1) The bacteria were killed almost completely by exposing to sunlight for about 30min. in May to October.
(2) The bacteria were killed almost completely by exposing to UV light (15W lamp, 40cm) for 40 sec. The survival rate was markedly increased when the concentration of bacterial suspension was higher than 108 per ml.
(3) The bacteria were able to grow at the temperature range of 2.5 to 34°C, and best growth was obtained at 28 to 32°C. Thermal death point in water was 46°C and 52°C, respectively when the concentration of bacteria was about 103 per ml and about 109 per ml. Thermal death point in dry air was 110°C. The bacteria survived longer in sterilized distilled water when the bacterial concentration was high and the temperature was low.
(4) The bacteria dried on a cover glass surived for 37 days in a desiccator.
(5) The bacteria were able to grow at pH 4 to 10, and maximum growth was obtained at pH 5 to 7.
