Common name: citrus blue mold.
Extract from Wikipedia article: Penicillium italicum is a fungal plant pathogen. It is a common post harvest disease commonly associated with citrus fruits.
Chinese: 義大利青黴, Persian: کپک آبی مرکبات, Russian: Пеницилл итальянский.
Penicillium italicum is a species of fungus in the Ascomycota phylum, commonly found on citrus fruits, particularly oranges. In East and Central Texas, it has been isolated from infected citrus fruits, such as oranges and lemons, causing blue mold rot. The fungus produces greenish-blue spores and grows optimally at 20-25°C. It is a significant postharvest pathogen in the region, causing spoilage and economic losses in the citrus industry.
Fallen fruits of trifoliate orange with blue and green mould caused by fungus Penicillium italicum on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, December 1, 2019
Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Blue mould caused by fungus Penicillium italicum on fallen fruits of trifoliate orange on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, December 1, 2019Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Close up of blue mould caused by fungus Penicillium italicum on a fallen and rotting fruit of trifoliate orange on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, December 1, 2019Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Blue mould caused by fungus Penicillium italicum on a fallen and rotting fruit of trifoliate orange in area of Caney Creek crossing on Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, February 9, 2020Lone Star Hiking Trail, Montgomery, TX 77356, USA
Blue mould caused by fungus Penicillium italicum on fallen fruits of trifoliate orange in area of Caney Creek crossing on Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, February 9, 2020Lone Star Hiking Trail, Montgomery, TX 77356, USA
Blue mould caused by fungus Penicillium italicum on fallen fruits of trifoliate orange on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, December 28, 2020Lone Star Hiking Trail, Montgomery, TX 77356, USA
Blue mould caused by fungus Penicillium italicum on a rotting fruit of trifoliate orange on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, December 28, 2020Lone Star Hiking Trail, Montgomery, TX 77356, USA
Blue mould caused by fungus Penicillium italicum(?) on a fallen fruit of trifoliate orange on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 7, 2021Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Rotting fruit of trifoliate orange with blue and green mould caused by fungus Penicillium italicum(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 7, 2021Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Blue mould caused by fungus Penicillium italicum on a fallen fruit of trifoliate orange on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, December 29, 2021Lone Star Hiking Trail, Montgomery County, Texas, United States
Close-up of blue mould caused by fungus Penicillium italicum on a fallen fruit of trifoliate orange on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, December 29, 2021Lone Star Hiking Trail, Montgomery County, Texas, United States
Variable in size conidia (in lugol) of blue mold fungus (Penicillium italicum) from trifoliate orange, collected on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 30, 2022
Conidiospores (in lugol) of blue mold fungus (Penicillium italicum) from trifoliate orange, collected on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 30, 2022
Blue mould caused by fungus Penicillium italicum on a fallen and crashed fruit of trifoliate orange on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 18, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Close-up of blue mould caused by fungus Penicillium italicum on a crashed fruit of trifoliate orange on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 18, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Fallen fruits of trifoliate orange (Poncirus trifoliata) with citrus blue mold fungus Penicillium italicum both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, October 10, 2024Observations of the fungus Penicillium italicum were made in East and Central Texas on fallen fruits of trifoliate orange. The fungus was found to cause blue and green mould on the fruits, with consistent observations over several years. Specific locations included Caney Creek Trail and Lone Star Hiking Trail in Sam Houston National Forest, near Montgomery and Huntsville. The mould was observed in various forms, including close-ups of conidia and conidiospores under lugol. The fungus was also found to fluoresce under 365 nm ultraviolet (UV-A) blacklight. Observations were made from December 2019 to October 2024, indicating a persistent presence of the fungus in the area. Multiple sightings on different trails and dates suggest that Penicillium italicum is a common inhabitant of fallen trifoliate orange fruits in East and Central Texas.
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