Distribution of propiconazole-resistant in peach orchards with or without cull fruit amendments.

Resistance to propiconazole in G. candidum was reported previously in isolates collected from peaches after cold storage, but the origin of resistance was unclear. If resistance had been generated and selected in the packinghouse with postharvest propiconazole drenches, we would expect to find resistance in the sour rot pathogen only in orchards that had received cull fruit returned to the orchard floor from the packinghouse.

Propiconazole resistance phenotypes in from South Carolina peaches are linked to point mutations in gene.

Geotrichum candidum Link (1809) is a yeast-like fungus that causes sour rot of peach (Prunus persica). Outbreaks of the disease have occurred since 2021 in peach fruit kept in cold storage despite post-harvest treatments with propiconazole at a commercial farm in South Carolina (SC). A total of 58 isolates, 40 from symptomatic fruit from cold storage in Saluda County (SC packing house isolates), 11 from three SC orchards in Saluda County, Spartanburg County, and Pickens County (SC non-packing house isolates), and 7 California (CA) isolates (at least 3 from packing houses) were evaluated for propiconazole sensitivity.

Fludioxonil does not antagonize propiconazole activity against .

Fludioxonil and propiconazole are frequently used fungicides for managing fungal diseases in specialty crops. They are often used in mixture to manage brown rot caused by Monilinia fructicola and sour rot caused by the yeast-like fungus Geotrichum candidum,respectively, on stone fruits. Research indicated, however, that fludioxonil can increase the expression of the ATP-binding cassette transporters CDR1 and CDR2 in the yeast Candida albicans, leading to increased resistance to DMI fungicides.

In vitro co-culture system for investigating Armillaria root rot in Prunus spp. using a fiber-supported liquid approach.

In vitro co-culture techniques that allow the growth of plants and pathogens under controlled environmental conditions are being used to re-create host plant infection. These approaches reduce infection times, promote reproducibility, and enable a rapid evaluation of plant-pathogen interactions. As a result, these systems have become essential in breeding programs aimed at developing plant resistance to diseases.

Characterization and Fungicide Sensitivity of Causing Gnomonia Leaf Blotch of Strawberry in the Carolinas.

Emerging fungal pathogens have always been an issue of concern in southeastern U.S. strawberry production.