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Ascospore Discharge and Survival in Pseudopezicula tracheiphila, Causal Agent of Rotbrenner of Grape
Author(s) -
Pearson R. C.,
Siegfried W.,
Bodmer M.,
Schüepp H.
Publication year - 1991
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.1439-0434.1991.tb00110.x
Subject(s) - ascospore , biology , spore , relative humidity , horticulture , vineyard , botany , zoology , meteorology , physics
A recording volumetric spore trap was operated continuously amidst overwintered grape leaves in a vineyard at Walenstadt, Switzerland from early May to mid‐July 1988. Ascospores of Pseudopezicula tracheiphila were captured in the air beginning 11 May and 96 % of the total seasonal release occurred between 16 May and 2 June. Rain always preceded ascospore release. However, trap catches were associated with the simulataneous cessation of rainfall, decreased relative humidity (RH), increased temperature, and drying of foliage. Maximum ascospore release occurred in the second hour, following commencement of drying. Ascospores discharged dry onto glass coverslips survived with greater than 60 % viability after 1, 3, and 6 days exposure to 10, 15, 20, and 25°C at 70 % RH. Only at 30°C was viability reduced to slightly less than 50 % after 6 days.