Control of Blumeria graminis f.sp. hordei by treatment with mycelial extracts from cultured fungi
Version of Record online: 9 OCT 2008
Volume 50, Issue 5, pages 552–560, October 2001
How to Cite
Haugaard, H., Lyngs Jørgensen, H. J., Lyngkjær, M. F., Smedegaard-Petersen, V. and Collinge, D. B. (2001), Control of Blumeria graminis f.sp. hordei by treatment with mycelial extracts from cultured fungi. Plant Pathology, 50: 552–560. doi: 10.1046/j.1365-3059.2001.00595.x
- Issue online: 9 OCT 2008
- Version of Record online: 9 OCT 2008
- Accepted 27 February 2001.
- biological control;
- Blumeria graminis;
- Erysiphe graminis;
- powdery mildew
High levels of protection against infection from Blumeria graminis f.sp. hordei in the susceptible barley cv. Pallas were obtained by pretreatment with mycelial extracts or culture filtrates from seven different fungi (Bipolaris oryzae, B. sorokiniana, Drechslera teres f. maculata, Fusarium culmorum, Trichoderma harzianum, Pythium ultimum and Rhizopus stolonifer). Three mycelial extracts from the taxonomically different fungi B. oryzae, P. ultimum and R. stolonifer were selected for detailed study. In general the number of colonies formed was reduced by 70–98% compared with controls. Furthermore, the few colonies that developed on treated leaves were generally smaller and showed reduced spore production. Protection was limited to the area of the leaves treated with mycelial extracts and a systemic effect could not be detected. No differences in the protection level were observed when treatment was conducted between 2 h and 3 days before inoculation. It is suggested that components in the mycelial extracts interacted directly with B. graminis and that this antifungal effect was responsible for the observed protection. However, indirect effects of the mycelial extracts mediated by locally induced resistance cannot be precluded.