Seed-applied, in-furrow, and post-harvest fungicides can also reduce disease incidence. Infection reduces both the visual appeal of a fresh market potato tuber and reduces the quality of potato tubers as the infection creates damage to the periderm or skin which enables the onset of other pathogens or enhanced desiccation.Ĭultural management involves using clean, uninfected seed potatoes, rotating planting sites, promptly harvesting fields after potato foliar senescence, disinfecting storage facilities, and maintaining properly cold and ventilated storage areas. Favorable conditions include high temperatures and humidity. The pathogen survives on infected tubers and infested plant debris, spreading via rain/irrigation in the field and airborne spores in storage. The pathogen causes tan-to-gray circular lesions typically initiating on the stem-end of the tuber surface, often appearing shiny and silver when wet. Potato Silver Scurf is a fungal blemish disease of potato tubers caused by Helminthosporium solani. The variability in lesion appearance is often the result of differences in moisture. Symptomatic tubers typically have sunken and firm brown lesions that may extend several centimeters into the tuber. Dark green, brown, or black water-soaked lesions on the stem may also contain sporulation. Enlarged, water- soaked or wet and oily-appearing leaf lesions often give rise to sporulation, identifiable by white or gray fuzzy growth. Leaf symptoms include circular, necrotic or brown lesions surrounded by collapsed pale or chlorotic (pale green to yellow) tissue. Symptoms of late blight can occur on all parts of a potato plant. However, it is most infamously known for its destruction of potato, S. The pathogen that causes late blight, Phytophthora infestans, infects a variety of Solanum spp., including eggplant, pepper, nightshades, and petunia. Potato Late Blight is a disease that typically causes severe symptoms on flowering plants of the family Solanaceae.
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