European Journal of Forest Pathology (1997) 27, 391-396

A. Ragazzi, S. Moricca and I. Dellavalle (1997)
Vegetative compatibility and pathogenicity of Diplodia mutila isolates on oak
European Journal of Forest Pathology 27 (6), 391-396
Abstract: Forty isolates of Diplodia mutila, a dieback agent on oaks were characterized by their capacity to produce heterokaryons, by their vegetative compatibility, and by their pathogenicity tests on Quercus cerris. The forty isolates were collected from Quercus cerris, Quercus frainetto, Quercus ilex, Quercus pubescens, Quercus robur and Quercus suber in different regions in Italy. Three nit mutants (nit_t, nit and nit_M) were identified with different nitrogen sources: sodium nitrite, sodium nitrate, uric acid, ammonium tartrate and hypoxanthine. On the two nutrient media employed, a potato dextrose agar (PDA) medium with chlorate (PDC), and a minimal agar medium with chlorate (MMC), isolates obtained from Q. cerris yielded the greatest number of mutants: 254 on PDC (out of a total of 583) and 190 on MMC (out of a total of 440). Nine vegetative compatibility groups (VCGs) were identified. There was a strong association between these VCGs and host species. All isolates tested except one from Q. cerris were pathogenic.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Alessandro Ragazzi, Salvatore Moricca

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diplodia mutila	Oak (Quercus)	Italy