Common name: fly-speck leaf spot.
Ophiodothella vaccinii is a species of fungus in the family Phyllachoraceae, order Phyllachorales, class Sordariomycetes, phylum Ascomycota. It is a parasitic fungus that infects leaves and stems of Vaccinium species, particularly blueberries. In East and Central Texas, Ophiodothella vaccinii has been found to cause leaf spots and fruit rot on southern highbush blueberry and rabbiteye blueberry. The fungus produces black, globose perithecia on infected plant tissues, containing cylindrical asci with fusoid, 2-celled ascospores. Infection typically occurs during warm, humid weather, and the fungus can be dispersed by rain splash and insect vectors.
Black dots of fruiting structures of a fungus Ophiodothella vaccinii on leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, October 9, 2018
Fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, October 9, 2018
Blister-like fruiting structures of fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, October 9, 2018
Conidiomata of fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, October 9, 2018
Close up of conidiomata of fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, October 9, 2018
Fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, August 2, 2019
Blister-like fruiting structures of fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, August 2, 2019
Conidiomata of fungus Ophiodothella vaccinii on infected leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, August 2, 2019
Black dots of fruiting structures of a fungus Ophiodothella vaccinii on leaves of farkleberry (Vaccinium arboreum) in Lick Creek Park. College Station, Texas, August 2, 2019Observations of the fungus Ophiodothella vaccinii on farkleberry (Vaccinium arboreum) in East and Central Texas revealed distinctive fruiting structures. Black dots of fruiting structures were visible on infected leaves, while blister-like structures and conidiomata were also present. These structures were observed in Lick Creek Park, College Station, Texas, on two separate occasions: October 9, 2018, and August 2, 2019. The fungus was found to infect leaves of farkleberry, with infected leaves displaying various stages of infection. Close-up observations revealed detailed views of the conidiomata, showcasing the unique characteristics of the fungus. The consistent presence of Ophiodothella vaccinii on farkleberry in this region suggests a specific host-pathogen relationship. The fungus's fruiting structures were consistently observed as black dots or blister-like formations on infected leaves.
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