Factors influencing the occurrence of post-harvest diseases of tulip bulbs caused by Pseudomonas andropogonis and P. gladioli during the storage and distribution were examined. The disease occurrence of the bulbs was promoted by washing in running water or dipping in the insecticide for bulb mite. Thus, following to the increase of the dipping times to the insecticide, the population of P. gladioli in the bulbs increased and the disease increased. The pathogen populations in the bulbs decreased to remove the debris of the bulb scales and roots before washing. The disease development in the bulbs was influenced by several factors such as wounding, wetness, and temperature other than the pathogen density during storage.
In 1992, diseased flowers of cosmos (Cosmos bipinnatus) were found in Kanagawa Prefecture, Japan. Small water-soaked lesions occurred first on flowers and flower buds. These lesions then enlarged and turned light brown. Diseased flowers and flower buds eventually fell off. The fungus produced fusiform conidia on the PDA medium, 11-14×2.8-3.5μm in size. From those results, the fungus was identified as Colletotrichum acutatum Simmonds ex Simmonds. It has been newly added as a pathogen causing anthracnose on cosmos.
In October 1994, sprouting inhibition of anemone (Anemone coronaria L.) tuber was found at Tsu city. One species of Rhizopus was isolated from the affected tuber. The morphological characteristics and optimum temperature of mycelial growth of the fungus closely fit the C.M.I. descriptions of Rhizopus oryzae Went et Prinsen Geerligs. The pathogenicity of this isolate to anemone tubers was confirmed and the disease was named tuber rot. This is the first report of tuber rot of anemone caused by R. oryzae in Japan.