Pezicula canker of Quercus rubra L., caused by Pezicula cinnamomea (DC.) Sacc..

Kehr, Rolf

doi:10.1111/j.1439-0329.1992.tb01429.x

Cited by 13 publications

(3 citation statements)

References 15 publications

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“…However, more isolations from other stands and other Quercus species are needed to confirm this assumption. KEHR (1991KEHR ( , 1992 and BUTIN (1981) also described cortical diseases on oaks caused by Pezicula cinnamomea (DC.) Sacc.…”

Section: Discussionmentioning

confidence: 99%

Isolation, identification and pathogenicity of Phytophthora species from declining oak stands

Jung¹,

Blaschke²,

Neumann

1996

European Journal of Forest Pathology

309

404

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Summary Within the scope of a research project on the condition of roots of declining oaks (Quercus robur, Quercus petraea), samples of fine roots and surrounding soil, specimens of stripe cankers on the stem base, and samples of stream water were examined for the presence of Phytophthora species using both baiting methods and selective agar media. At 27 sites in Germany (Bavaria, Rheinland‐Pfalz, Schleswig‐Holstein), Switzerland, Hungary, Italy and Slovenia the following species were isolated (mainly from soil): Phytophthora citricola, Phytophthora cactorum, Phytophthora cambivora, Phytophthora gon‐apodyides, Phytophthora undulata, a species with affinity to Phytophthora drechsleri, and two additional species with close affinity to the Phytophthora cactorum group. Moreover, Pythium group P, Pythium anandrum, Pythium chamaehyphon, and many other Pythium species that have not yet been identified could be recovered. In a soil infestation test most isolates induced dieback of long root tips and necrotic lesions in the root cortex and at the root collar of Quercus robur seedlings. All Phytophthora species tested and Pythium group P caused cortical necrosis after stem inoculation of young Quercus robur trees. It could be shown in vitro that Phytophthora gonapodyides and Pythium group P were able to produce a wilting toxin. Nitrogen input and climatic changes are discussed as predisposing factors for root damage observed in the field.

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Section: Discussionmentioning

confidence: 99%

Isolation, identification and pathogenicity of Phytophthora species from declining oak stands

Jung¹,

Blaschke²,

Neumann

1996

European Journal of Forest Pathology

309

404

View full text Add to dashboard Cite

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“…Pezicula dnnamomea was frequently present both in dead twigs and in stem necroses of all stages. It is a known endophyte and weak parasite on red oak, oak and other trees (KEHR 1991(KEHR , 1992KOWALSKI and KEHR 1992) and is involved in branch pruning of oak and red oak (BUTIN and KOWALSKI 1983). In red oak, superficial bark necrosis similar to that observed in this study was caused by P. dnnamomea following artificial inoculation (KEHR 1991).…”

Section: Discussionmentioning

confidence: 99%