Figure 1. Sclerotia removed from an infected sunflower stem (Sam Markell, NDSU).
Figure 2. Sclerotia formed over the face of an infected sunflower (Tom Gulya, USDA).
Figure 3. Single sunflower plant wilting from Sclerotina basal stalk rot (Sam Markell, NDSU).
Figure 4. A row of sunflower plants wilted from Sclerotina basal stalk rot (Sam Markell, NDSU).
Figure 5. A cluster of sunflower plants wilted from Sclerotina basal stalk rot (Sam Markell, NDSU).
Figure 6. Sclerotina basal stalk rot lesion (Sam Markell, NDSU).
Figure 7. Basal lesion with white fungal growth of S. sclerotiorum (Sam Markell, NDSU).
Figure 8. Basal lesion with hard black sclerotia and white fungal growth of S. sclerotiorum (Sam Markell, NDSU).
Figure 9. Basal lesion with hard black sclerotia and white fungal growth of S. sclerotiorum (Sam Markell, NDSU).
Figure 10. Lodging caused by Sclerotinia wilt (Sam Markell, NDSU).
Figure 11. Apothecia of S. sclerotiorum in cereal residue (Sam Markell, NDSU).
Figure 12. Sclerotinia sclerotiorum spreading from a colonized sunflower floret into healthy green tissue of a sunflower leaf (Sam Markell, NDSU).
Figure 13. Mid-stem lesion of Sclerotinia mid-stem rot (Sam Markell, NDSU).
Figure 14. Shredding of sunflower stem caused by Sclerotinia mid-stem rot (Sam Markell, NDSU).
Figure 15. Sclerotia of S. sclerotiorum in shredded mid-stem lesion (Sam Markell, NDSU).
Figure 16. Stem breakage and white fungal growth of S. sclerotiorum in mid-stem lesion (Sam Markell, NDSU).
Figure 17. Plant to plant spread of S. sclerotiorum (Sam Markell, NDSU).
Figure 18. Soft, mushy and brown lesion on the edge of a sunflower head, caused by Sclerotinia head rot (Sam Markell, NDSU).
Figure 19. Soft, mushy and brown lesion caused by Sclerotinia head rot (Sam Markell, NDSU).
Figure 20. Sclerotinia head rot lesion on the quadrant of an infected sunflower head (Sam Markell, NDSU).
Figure 21. Sclerotinia head rot lesion progressing around the sunflower neck and head (Sam Markell, NDSU).
Figure 22. Sunflower head and neck completely colonized by S. sclerotiorum (Sam Markell, NDSU).
Figure 23. Shredded sunflower head due to Sclerotinia head rot (Sam Markell, NDSU).
Figure 24. Decapitated sunflower head as a result of Sclerotinia head rot (Sam Markell, NDSU).
Figure 25. While fungal growth (mycelium) of S. sclerotiorum on sunflower head (Sam Markell, NDSU).
Figure 26. Colonized sunflower head with profuse sclerotia of S. sclerotiorum (Sam Markell, NDSU).
Figure 27. Abundant S. sclerotiorum sclerotia in shredded sunflower head (Sam Markell, NDSU).
Figure 28. Shredded sunflower head with most seed dropped, leaving skeletonized head with sclerotia present (Sam Markell, NDSU).
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