Abstract
Citrus is one of the most economically important crops in Florida. In 2022 surveys of 46 citrus groves in southwest Florida, twig dieback and anthracnose on fruit, leaves and twigs were frequently observed. The occurrence, diversity, pathogenicity and sensitivity to chemical compounds of Colletotrichum strains isolated from symptomatic Citrus sinensis cv. Valencia were investigated. One hundred representative monoconidial isolates were identified as Colletotrichum gloeosporioides by phylogenetic analysis based on five genomic loci (GAPDH, ACT, TUB2, GS and ApMat). Fruit pathogenicity tests performed on seven representative isolates confirmed the pathogenicity of the identified species. This study is the first report of C. gloeosporioides associated with twig dieback and preharvest anthracnose on Ci. sinensis cv. Valencia in Florida. The sensitivity of 100 isolates of C. gloeosporioides to fenbuconazole (DMI), fluopyram (SDHI) and pyraclostrobin (QoI) was assessed by inhibition of conidial germination. Over 50% of tested isolates showed reduced sensitivity to fenbuconazole, fluopyram and pyraclostrobin, providing the first evaluation of the in vitro sensitivity of C. gloeosporioides strains isolated from Ci. sinensis cv. Valencia in Florida. These molecules appear unable to control the spread and development of C. gloeosporioides on Ci. sinensis cv. Valencia in Florida. Due to several citrus diseases that have severely affected Florida's citrus industry over the past 20 years, fungal diseases such as anthracnose have been neglected, but are increasing in importance in recent years worldwide. Our study represents a starting point for the development of new solutions to manage this problem for citrus growers.
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Claims 6
Claim · model-written summary
Twig dieback and anthracnose were frequently observed in southwest Florida groves.
- Organ / stage
- fruit, leaves and twigse0
- Outcome
- twig dieback and anthracnosee0
- Setting
- southwest Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2022 surveys of 46 citrus groves in southwest Florida, twig dieback and anthracnose on fruit, leaves and twigs were frequently observed”
Claim · model-written summary
One hundred isolates from symptomatic sweet orange were identified as C. gloeosporioides.
- Taxon
- Citrus sinensis
Citrus sinensist0 - Interactor
- Colletotrichum gloeosporioides
Colletotrichum gloeosporioidese0pathogen - Outcome
- identified as Colletotrichum gloeosporioidese0
- Value
- One hundrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One hundred representative monoconidial isolates were identified as Colletotrichum gloeosporioides by phylogenetic analysis based on five genomic loci (GAPDH, ACT, TUB2, GS and ApMat)”
t0“Citrus sinensis”
Claim · model-written summary
Fruit pathogenicity tests confirmed the identified species was pathogenic.
- Taxon
- Citrus sinensisCitrus sinensist0
- Organ / stage
- Fruite0
- Outcome
- pathogenicity of the identified speciese0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit pathogenicity tests performed on seven representative isolates confirmed the pathogenicity of the identified species”
t0“Citrus sinensis”
Claim · model-written summary
The study reported C. gloeosporioides with twig dieback and preharvest anthracnose on Valencia sweet orange in Florida for the first time.
- Taxon
- Ci. sinensise0
- Material
- cv. Valenciae0
- Interactor
- C. gloeosporioidesColletotrichum gloeosporioidese0pathogen
- Outcome
- twig dieback and preharvest anthracnosee0
- Setting
- Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“first report of C. gloeosporioides associated with twig dieback and preharvest anthracnose on Ci. sinensis cv. Valencia in Florida”
Claim · model-written summary
More than half the isolates showed reduced sensitivity to three fungicides.
- Taxon
- Citrus sinensisCitrus sinensist0
- Treatment
- fenbuconazole, fluopyram and pyraclostrobine0
- Outcome
- isolates showed reduced sensitivitye0
- Direction
- reducede0
- Value
- Over 50%e0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over 50% of tested isolates showed reduced sensitivity to fenbuconazole, fluopyram and pyraclostrobin”
t0“Citrus sinensis”
Claim · model-written summary
The authors judged the three fungicides unlikely to control C. gloeosporioides spread and development on Valencia sweet orange.
- Taxon
- Ci. sinensise0
- Material
- cv. Valenciae0
- Interactor
- C. gloeosporioidesColletotrichum gloeosporioidese0pathogen
- Outcome
- unable to control the spread and developmente0
- Setting
- Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These molecules appear unable to control the spread and development of C. gloeosporioides on Ci. sinensis cv. Valencia in Florida”