Assigbetse, Komi

Boisson, Claude

Daayf, F.

Dossa, C.

Henni, J.

Horizon / Pleins textes

VARTABILITY IN PATHOGEMCITY OF VERTICILLIUM AND FUSARIUM 
CAUSING WlLT DISEASES IN MEDITERRANEAN AND TROPICAL COUNTRIES 
C. BOISSON(l), K. ASSIGBETSE(l), F. DAAYF(1) 
C. DOSSA(1) and J. " ( 2 )  
(1) Dpt of Phytopathology, ORSTOM, B.P. 5045 - 34032 - Montpellier Cedex 1 
(2) Dpt of Microbiology, Oran University, 255 B.P. 1524 - ES. SENA - ALGERIE 
FRANCE 
The variability of pathogenicity was studied with Vertz~cillium dahlia on tomato 
and cotton, and with different fomae speciales of Fusarium oxysporum : f. sp. elaeidis 
on oil palm, f. sp. lycopercisi on tomato and f. sp. vasinfectum on cotton. 
The Pathogenicity of several types of cultures was compared: clones issued from 
one isolate, ageing cultures issued from a clone maintened in saprophytic life with or 
without mycelial transfert and subclones obtained from clones of different ages. 
The pathogenicity of V. dahlia is very variable between clones issued from one 
isolate, between cultures of different ages issued from a clone and between subclones 
obtained by monospore transfert from a clone. Intraclonal variation of pathogenicity 
appeared in wild strains only; it is note worthy that hyalin subclones unable to form 
microsclerot a were very stable in their pathogenicity. 
With one exception, the pathogenicity of F. oxysporm was more stable. We 
observed variations only between clones issued from isolates of F. oxysporum f. sp. 
lycopercisi and F .  oxysponun f.sp. vasinfectum. 
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VASCULAR PATHOGENS 
Dr. Richard Shnttock. 
School of Biological Sciences. 
University of Wales, 
Bangor, 
Gvynedd U 5 7  2w. 
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Vascular pathogens

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