Pathogenicity of Tubakia dryina

The occurrence of Tubakia dryina in Poland – new hosts and ITS variation

“…These structures, up to 0.1 mm in diameter, may emerge on the necrotic areas of the leaf blade on the adaxial or abaxial leaf surface. These structures are not always present however, even on larger blotches (Munkvold & Neely, 1990).…”

“…Additionally, symptoms may vary (Kowalski, 2006). These structures are not always present however, even on larger blotches (Munkvold & Neely, 1990). This situation resulted in premature abscission.…”

“…Necrotic spots or blotches are, however, non-specific symptoms: they may be caused by many different pathogens (Kowalski, 2006). Conclusive evidence of T. dryina infection is the presence of characteristic pycnotheria (Munkvold & Neely, 1990;Proffer, 1990). Examination revealed blackening of the leaf petiole along with initially vein-associated and quickly expanding necroses.…”

“…Tubakia leaf spot disease causes brown necrotic spots on leaves (Proffer, 1990), which on oaks reach 1-15 mm in diameter, although spots may merge to form larger blotches (Munkvold & Neely, 1990).…”

“…This situation resulted in premature abscission. Conclusive evidence of T. dryina infection is the presence of characteristic pycnotheria (Munkvold & Neely, 1990;Proffer, 1990). These structures, up to 0.1 mm in diameter, may emerge on the necrotic areas of the leaf blade on the adaxial or abaxial leaf surface.…”