![]() Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. After disease you can use: Ranman, or Orondis Opti A, or Zampro every five days in rotation. Active ingredientįor example, before disease you can use: Forum, or Curzate, every seven days in rotation. Example products for potato late blight control. Fungicide labels are legal documents, always read and follow fungicide labels. For the latest fungicide recommendations for potato late blight see the Southeastern US Vegetable Crop Handbook. Alternate products and tank mix mancozeb or chlorothalonil to avoid generating fungicide-resistant strains. After disease is detected in your area, apply fungicides at 5-7 day intervals. Both sporangia and zoospores can germinate to produce the pathogen.ĭisease Control for Conventional Growers Skip to Disease Control for Conventional Growersīefore disease occurs, apply fungicides at 7-10 day intervals. Sporangia contain 20-30 smaller swimming spores called zoospores that travel through water to infect plants. Sporangia can be seen in the field with a 20X hand lens when weather conditions are favorable. Identification of potato late blight can be difficult since symptoms resemble other diseases, but spores and mycelia on the underside of the leaf can provide additional evidence of the pathogen. When conditions are favorable, for example early in the morning when the moisture is higher, lesions observed from the underside of the leaf may be covered in mycelia or white spores called sporangia, especially at the edges of the lesion ( Figure 4). Leaf lesions usually begin on the edges, are circular and have yellow to pale green borders. Brown to gray water soaked lesions occur on stems ( Figure 1) and leaves ( Figure 2 and Figure 3). Infected tubers frequently develop secondary bacterial soft rots. Tissue inside the tuber, under the surface of lesions turns brown and granular. ![]() The pathogen causes purple to brown, sunken, dry lesions on the surface of tubers that extend into the tuber ( Figure 1).
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