Author : Ee Yu Kam

Summary : Eight ginger isolates of Pseudomonas solanacearum from five provinces in the Philippines were studied to determine their i) host ranges, ii) ability to utilize disaccharides or hexose alcohols, iii) colony morphology on tetrazolium chloride agar, nutrient agar and potato dextrose agar plus 1 % peptone, iv) ability to produce the melanin pigment in a tyrosine containing agar medium, v) ability to cause hypersensitive reaction in tobacco leaves and vi) susceptibility to five bacteriophage isolates. Results showed that all the isolates oxidized hexose alcohols only and therefore belonged to biochemical type 4, produced hypersensitive reaction in tobaco leaves, were avirulent to tobacco, eggplant, sweet pepper, potato, peanut, lima bean, cowpea, diploid and triploid banana, and heliconia, under natural conditions.