Journal of Applied Microbiology (2021) 130, 1656-1670

M. Bonacci, A.N. Formento, M.C. Morales, J. Orlando, F. Ibáñez, M. Sartori, M. Etcheverry, A. Nesci and G. Barros (2021)
Conyza bonariensis as an alternative host for Colletotrichum species in Argentina
Journal of Applied Microbiology 130 (5), 1656-1670
Abstract:
Aims
This study investigated the diversity of Colletotrichum isolates recovered from Conyza bonariensis leaves through the use of morphological characteristics, growth rate, carbon sources utilization and phylogenetic analysis.
Methods and Results
In all, 30 Colletotrichum isolates recovered from C. bonariensis leaves showing symptoms of disease were included in the present study. Based on the analysis of morphology and sequences, the isolates were distributed into six Colletotrichum species complexes. The concatenated alignment of GAPDH and ITS sequences showed that 20 out of 30 isolates were included in four species complexes which comprise the most important pathogens causing anthracnose in soybean or anthracnose and stalk rot in maize: C. truncatum, C. orchidearum, C. gloeosporioides and C. graminicola. The remaining 10 isolates were included in the C. boninense and C. destructivum species complexes or could not be assigned to any complex with the available information.
Conclusion
Weeds belonging to genus Conyza are host to soybean and maize potential pathogenic species of Colletotrichum and could have a role as inoculum reservoir for cross contamination in the agroecosystem.
Significance and Impact of the Study
The combined use of morphological, kinetics and physiological parameters of growth and phylogenetic analysis in Colletotrichum isolates from Conyza leaves allowed the detection of species complexes previously not identified in Argentina.
(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): Miriam G. Etcheverry

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Colletotrichum truncatum	Soybean (Glycine max)	Argentina
	Erigeron bonariensis (weed)		Argentina
	Colletotrichum orchidearum	Soybean (Glycine max)	Argentina