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Der Einfluβ von Sauerstoff und UV‐Licht auf die Konidienproduktion von Pseudocercospordh herpotrichoides (Fron) Deighton, Merkmale zur Morphologie des Erregers und dessen Nachweis an Dikotyledonen
Author(s) -
Gieffers W.,
Paul V. H.,
Ritter E.
Publication year - 1989
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1989.tb01096.x
Subject(s) - biology , conidium , spore , botany , inoculation , horticulture
The influence of oxygen and U.V.‐light for the conidia production of Pseudocercosporella herpotrichoides (Fron) Deighton, morphological characters of the pathogen and its evidence on dicotyledons The particular importance of oxygen was detected for sporulation of Pseudocercosporella herpotrichoides . Four methods have been elaborated for different sporulation requirements of P. herpotrichoides . Only for a few populations three methods were necessary for rapid conidia production. The best method for maximum conidia production consisted of the following conditions: a constant temperature of 10 °C, permanent moistening with liquid water for inoculated materials, oxygen and U. V.‐light. Infected stalks and leaves from cereals were sporulating after 3 days and inoculated materials after 3 to 6 days. Maximum conidia production was reached after 7 to 21 days. Good sporulation was obtained also under cool temperatures, permanent moisture and air and light conditions in the open. But the conidia production was stronger under controlled conditions. Different isolates of P. herpotrichoides were compared with respect to morphological characteristics of hyphae, mycelia and conidia. Thus far observed only on cereals and grasses. P. herpotrichoides was found also on dicotyledons by the sporulation method described. This evidence has been obtained on an isolate of 00‐winter rape ( Brassica napus, ssp. Oleifera ). Moreover P. herpotrichoides has been found on chlorotic and necrotic leaves of rape, flesh‐coloured trefoil ( Trifolium incarnatum ), madia‐oil plant ( Linum usitatissimum L.) and lady's‐thistle ( Silyhum marianum [L.] Gaertn.) in high frequency. P. capsellae was found on necrotic leaves of chickweed ( Stellaria media ).