Bacterial Post-harvest Diseases of Tulip in Japan.

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  • 収穫後のチューリップ球根に黒褐色病斑を形成させる細菌病
  • シュウカクゴ ノ チューリップ キュウコン ニ コクカッショク ビョウハン オ

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Abstract

Post-harvest blackish-brown rot in tulip bulbs, seemingly due to bacteria was found in Toyama Prefecture from July to August, 1987. The brownish, non-uniform lesions occurred on the outer scales of affected bulbs and sometimes invaded the top of second and third scales. Detailed observation of development of the disease in affected bulbs revealed two different types of symptoms (Types-I, -II). The margin of type-I lesions generally spread into the surface tissues of scale, whereas those of type-II generally spread into the inner tissues of the scale. However, the initial spots were so similar to each other that they could not be distinguished. Frequently, the color of the lesions of type-II was more brownish than that of type-I. Twenty four bacterial isolates were obtained from the affected bulbs. These isolates were divided into two groups based on physiological and serologica characteristics of the bacteria. The groups corresponded to the original symptom types, that is, group-I were isolates from type-I, while group-II were from type-II. Each group caused the disease and produced the original symptoms when artificially inoculated. Twelve isolates of group-I were identified as Pseudomonas andropogonis, the causal bacterium of bacterial black rot in tulip bulbs, while 12 isolates of group-II were founded to be Pseudomonas gladioli. This paper presents the first reported case of the disease caused by P. gladioli and the name bacterial brown rot in tulip bulbs is proposed.

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