Skip to Main Content
Evaluation of fungicides for the control of Phytophthora ramorum infecting Rhododendron, Camellia, Viburnum, and PierisAuthor(s): S.A. Tjosvold; D.L. Chambers; S. Koike
Source: In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 269-271
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (23 KB)
DescriptionPhytophthora ramorum has been detected infecting ornamental hosts in European nurseries and gardens beginning in 1993, and detected in North American nurseries beginning in 2000. Nursery operators need a comprehensive program to insure that nursery stock remain disease free. Fungicides could be part of an integrated pest management approach to meet that goal. It is also important to evaluate whether fungicides are masking symptoms and the detection of the pathogen.
For two years we evaluated fungicides for the prevention and eradication of P. ramorum on four important ornamental genera of nursery hosts: two cultivars of Rhododendron (R. 'Cunningham’s White' and R. 'Irish Lace') in 2003, and Camellia japonica 'Elena Nobile', Pieris japonica 'Whitewater', and Viburnum tinus 'Compacta' in 2004. First, we screened prospective fungicides by evaluating the preventative control of a wide range of commercially-available and experimental Oomycete fungicides. Second, we selected the fungicides that provided the best efficacy in the fungicide screen and repeated these applications to determine their residual action to prevent infection. Efficacy was also judged by how well the pathogen was recovered from lesions resulting from infections. Finally, the eradicative potential of these fungicides were judged by the success of recovery of the pathogen from lesions that were treated with these fungicides.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationTjosvold, S.A.; Chambers, D.L.; Koike, S. 2006. Evaluation of fungicides for the control of Phytophthora ramorum infecting Rhododendron, Camellia, Viburnum, and Pieris. In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 269-271
KeywordsPhytophthora ramorum, fungicide, azalea, fosetyl-A1, phosphorous acid, copper sulfate pentahydrate, cuprous oxide, azoxystrobin zoxamide, mancozeb
- Effect of environmental conditions and lesion age on sporulation of Phytophthora ramorum on California bay laurel, rhododendron, and camellia
- Seasonal symptom expression, laboratory detection success, and sporulation potential of Phytophthora ramorum on rhododendron and camellia
- Fungicide control of Phytophthora ramorum on rhododendron
XML: View XML