Comparative effects of temperature and humidity on the activity of three potential antagonists of rose powdery mildew |
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| Authors: | M R Hajlaoui R R Bélanger |
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| Institution: | (1) Département de Phytologie, Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, G1K 7P4 Québec, Qc, Canada |
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| Abstract: | Three reported antagonists of cucumber powdery mildew,Stephanoascus flocculosus, Stephanoascus rugulosus, andTilletiopsis washingtonensis, were tested and compared under different environmental conditions for their potential for controlling rose powdery mildew, caused bySphaerotheca pannosa var.rosae. Under controlled conditions in vitro, all three fungi induced a rapid collapse of conidia, conidiophores and hyphae ofS. pannosa var.rosae on detached leaflets of miniature roses within 48 h following their application, as observed under a SEM. Both temperature and relative humidity (r.h.) affected the activity of the antagonists differently. The colonization of powdery mildew was maximal at 26 °C, especially forSt. rugulosus andT. washingtonensis. Maximal colonization was achieved at the highest r.h. tested (90%) for all three antagonists but onlySt. flocculosus maintained a colonization of 80% or better under lower r.h. These observations stress the importance of considering environmental conditions when assessing the activity of antagonistic microorganisms. |
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| Keywords: | Biological control hyperparasites Sphaerotheca pannosa var rosae Stephanoascus spp Tilletiopsis washingtonensis |
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