Pacific Northwest 1998 An Online Guide to Plant Disease Control

FactSheets offer superior print quality for the page you are currently viewing. Using Microsoft's Internet Explorer has given best printing results.
Glossary
Guide Home
Search

OSU Extension Office
 
Wheat -- Leaf Rust (Brown Rust)
 
Cause: A fungus, Puccinia triticina (formerly P. recondita f. sp. tritici), which overwinters on volunteer wheat, barley, and certain wild grasses. The fungi overwinter in Oregon mostly in the red spore (urediniospore) stage. Early-maturing wheat cultivars largely escape serious rust damage. Leaf rust is generally present and can cause serious yield losses, especially in combination with Septoria spp.
Symptoms: Round to oblong, brick-red pustules (uredia) appear on leaves, stems, and later on heads. As the crop ripens, black spores (telia) are produced.

 
Cultural control:

  1. Use early-maturing cultivars.
Chemical control:

  1. Seed treatments reduce seedling infections.
    1. Baytan 30 at 1.5 fl oz/100 lb seed plus a dye. See label for reentry restrictions.
    2. Dividend Extreme at 2 to 4 fl oz/100 lb of winter wheat or triticale seed. Do not graze green forage for 55 days after planting. Do not plant any crop other than wheat within 30 days in fields in which treated seeds were planted. See label for reentry restrictions.
    3. Dividend XL RTA at 10 fl oz/100 lb of winter wheat seed. Do not graze green forage until 55 days after planting. Do not plant any crop other than wheat within 30 days in fields in which treated seeds were planted.
    4. Raxil MD at 5 to 6.5 fl oz/100 lb seed plus a dye. See label for reentry restrictions.
    5. Raxil XT at 0.16 oz/100 lb seed (pouch form)plus a dye. See label for reentry restrictions.
  2. Foliar applications when the disease is severe.
    1. Bumper 41.8 EC at 4 fl oz/A. Highest yields are normally obtained when applied to the emerging flag leaf. May be applied until Feekes growth stage 10.5. Do not feed treated forage or cut green crop for hay or silage. 24-hr reentry.
    2. Dithane DF Rainshield at 2.1 lb/A or F-45 Rainshield at 1.6 quarts/A. Start applying at the onset of disease or when plants are in the tillering to jointing stage and repeat at 7- to 10-day intervals. Do not apply after Feekes 10.5 or heading. 24-hr reentry.
    3. Folicur 3.6F at 4 fl oz/A as a single application per season. Do not apply within 30 days of harvest. 12-hr reentry.
    4. Headline at 6 to 9 fl oz/A.Apply no later than the end of flowering (Feekes 10.5). To maximize yields in cereals it is important to protect the flag leaf. Do not harvest wheat hay within 14 days of last application. 12-hr reentry.
    5. Proline 480 SC at 4.3 to 5.0 fl oz/A on 14-day intervals. Preharvest interval is 30 days. 48-hr reentry.
    6. PropiMax EC at 4 fl oz/A no later than the end of flowering (Feekes 10.5). Do not graze or feed treated forage to livestock or harvest treated crop for hay or silage. After harvest, straw may be used for bedding. Do not apply more than 4 fl oz/A/season. Do not apply within 40 days of harvest. 24-hr reentry.
    7. Quadris at 4 to 12 fl oz/A. Applications may be made immediately after jointing (Feekes 6) up to late head emergence (Feekes 10.5). . Do not apply within 14 days of harvest for forage and hay. Do not apply within 45 days of harvest for grain and straw. 4-hr reentry.
    8. Quilt at 10 to 14 fl oz/A when the flag leaf is 50-70% emerged. Applications may be made no closer than a 14-day interval and may be applied up to Feekes growth stage 10.5. Do not feed treated forage or cut green crop for hay or silage. Preharvest interval is 45 days. 12-hr reentry.
    9. Stratego at 10 fl oz/A on7- to 10-day intervals if favorable conditions for disease persist. Do not apply within 35 days of har-vest. 24-hr reentry.
    10. Tilt at 4 oz/A in not less than 15 gal/A water (ground) or 5 gal/A water (air). Apply at flag-leaf emergence (Feekes stage 8) but no later than Feekes 10.5. Do not apply within 30 days of harvest for forage, 40 days for grain and straw and 45 days for hay. 12-hr reentry.
Content edited by: Cynthia M. Ocamb on January 1, 2009
 
Top

In print since 1954 and on the web since 1996. Questions or comments, please contact us.