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GenBank available sequences confirmed that three isolates (UBOCC-A-116036, -116038, and
-116039) clustered within C. gloeosporioides s. s., while the other (UBOCC-A-116037) clustered
within C. karsti. Star ruby grapefruits were surface sterilized and wound inoculated with 20 μl
of a conidial suspension (105 conidia ml?1) of UBOCC-A-116036 and -116037 isolates or 20 μl
of sterile water for control (10 fruit per isolate or control). After 10 days of incubation at
20°C, symptoms, identical to those initially observed, developed around the inoculation point;
controls
remained
symptomless.
Fungal
colonies
reisolated
from
the
lesions
were
morphologically like the original isolates. Recently, various infections caused by Colletotrichum
spp. have compromised citrus production in the Mediterranean countries of Italy (Aiello et al.
2015), Portugal (Ramos et al. 2016), Tunisia (Daoud et al. 2019), and Turkey (Uysal et al. 2022).
In these studies, C. gloeosporioides and C. karsti were identified as the causal agents. These
two species were the predominant Colletotrichum spp. associated with Citrus and allied genera
in Europe (Guarnaccia et al. 2017). To our knowledge, this is the first report of C.
gloeosporioides and C. karsti causing anthracnose on grapefruit in France, confirming the
incidence of these two pathogens on the Mediterranean rim. Given the economic importance of
citrus cultivation in the Mediterranean, Colletotrichum deserves to be monitored, and a control
strategy should be considered.
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-116039) clustered within C. gloeosporioides s. s., while the other (UBOCC-A-116037) clustered
within C. karsti. Star ruby grapefruits were surface sterilized and wound inoculated with 20 μl
of a conidial suspension (105 conidia ml?1) of UBOCC-A-116036 and -116037 isolates or 20 μl
of sterile water for control (10 fruit per isolate or control). After 10 days of incubation at
20°C, symptoms, identical to those initially observed, developed around the inoculation point;
controls
remained
symptomless.
Fungal
colonies
reisolated
from
the
lesions
were
morphologically like the original isolates. Recently, various infections caused by Colletotrichum
spp. have compromised citrus production in the Mediterranean countries of Italy (Aiello et al.
2015), Portugal (Ramos et al. 2016), Tunisia (Daoud et al. 2019), and Turkey (Uysal et al. 2022).
In these studies, C. gloeosporioides and C. karsti were identified as the causal agents. These
two species were the predominant Colletotrichum spp. associated with Citrus and allied genera
in Europe (Guarnaccia et al. 2017). To our knowledge, this is the first report of C.
gloeosporioides and C. karsti causing anthracnose on grapefruit in France, confirming the
incidence of these two pathogens on the Mediterranean rim. Given the economic importance of
citrus cultivation in the Mediterranean, Colletotrichum deserves to be monitored, and a control
strategy should be considered.
- 714 -
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