The diseases of ornamental plants caused by aphelenchoides ritzemabosi in association with fungi

Abstract

A great importance of Aphelenchoides ritzemahosi in a disease of Callistephus chinensis, Chrysanthemum spp. and Zinnia violaceae was found. In the disease process caused by the nematode, fungi of different parasitic abilities participated, e.g., Septoria chrysanthemella frequently attacked varieties of the genus Chrysanthemum, whereas Fusarium spp. affected C. chinensis. Longer rainy periods stimulated the development of higher epidemics of gray mold. Aphelenchoides ritzemabosi occasionally fed on hyphae that along with metabolities excreted into a medium differently influenced the nematode. Aphelenchoides ritzemabosi survived up to some years in a plant material. The phylloplane mycoflora population increased quantitatively and qualitatively when the plants aged. Filamentous fungi increased the necrosis of plants affected by the nematode. Fungi testing Botrytis cinerea showed a different potential of an antagonistic influence. Gonatobotrys simplex parasitized on Alternaria zinniae.

Key words:

• Ornamental plants
• Aphelenchoides ritzemabosi
• fungal diseases
• phylloplane mycoflora
• interactions‐antagonism

Notes

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