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Olive Anthracnose in Portugal Is Still Mostly Caused by Colletotrichum nymphaeae, but C. acutatum Is Spreading and C. alienum and C. cigarro Are Reported for the First Time
Publication . Cabral, Ana; Nascimento, Teresa; Azinheira, Helena; Loureiro, Andreia; Talhinhas, Pedro; Oliveira, Helena
Olive anthracnose, caused by Colletotrichum fungi, is responsible for major fruit yield losses
and poor olive oil quality worldwide. In the Mediterranean basin, some Colletotrichum spp. appear to
be replacing others, possibly due to climate change and modification in cultural systems. To update
the situation in Portugal, 525 olive groves were surveyed throughout the country over two years,
revealing a decrease in disease incidence, associated with scarcer rainfall and new cropping systems
using less susceptible cultivars. A collection of 212 isolates was obtained, and phylogenetic analyses
using a multi-locus sequencing approach (five and six loci in the acutatum and gloeosporioides species
complex, respectively) revealed the presence of seven Colletotrichum species within the collection.
Compared to surveys conducted in the first decade of the 21st century, the species composition
of olive anthracnose pathogens in Portugal remains mostly unchanged, with C. nymphaeae as the
prevalent species, followed by C. godetiae, but with C. acutatum geographically expanding and with
C. alienum and C. cigarro being reported for the first time as causal agents of olive anthracnose in
Portugal. A close attention to pathogen population shifts, in the context of climate change and
modification of cultivation systems, is fundamental for anticipating plant protection measures.
Olive Anthracnose in Portugal is still mostly caused by Colletotrichum nymphaeae, but C. acutatum is spreading and C. alienum and C. cigarro are reported for the first time
Publication . Cabral, Ana; Nascimento, Teresa; Azinheira, Helena; Loureiro, Andreia; Talhinhas, Pedro; Oliveira, Helena
Olive anthracnose, caused by Colletotrichum fungi, is responsible for major fruit yield losses
and poor olive oil quality worldwide. In the Mediterranean basin, some Colletotrichum spp. appear to
be replacing others, possibly due to climate change and modification in cultural systems. To update
the situation in Portugal, 525 olive groves were surveyed throughout the country over two years,
revealing a decrease in disease incidence, associated with scarcer rainfall and new cropping systems
using less susceptible cultivars. A collection of 212 isolates was obtained, and phylogenetic analyses
using a multi-locus sequencing approach (five and six loci in the acutatum and gloeosporioides species
complex, respectively) revealed the presence of seven Colletotrichum species within the collection.
Compared to surveys conducted in the first decade of the 21st century, the species composition
of olive anthracnose pathogens in Portugal remains mostly unchanged, with C. nymphaeae as the
prevalent species, followed by C. godetiae, but with C. acutatum geographically expanding and with
C. alienum and C. cigarro being reported for the first time as causal agents of olive anthracnose in
Portugal. A close attention to pathogen population shifts, in the context of climate change and
modification of cultivation systems, is fundamental for anticipating plant protection measures.
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Fundação para a Ciência e a Tecnologia
Programa de financiamento
DL 57/2016
Número da atribuição
DL 57/2016/CP1382/CT0010