LEE Wheat 5 Diseases

Information about LEE Wheat 5 Diseases

Published on October 4, 2007

Author: Alexan

Source: authorstream.com

Content

Wheat Diseases (Fusarium Head Blight):  Wheat Diseases (Fusarium Head Blight) Presentation by: Chad Lee, Grain Crops Extension Specialist University of Kentucky Most of the information comes from: ID-125: A Comprehensive Guide to Wheat Management in Kentucky:  Most of the information comes from: ID-125: A Comprehensive Guide to Wheat Management in Kentucky Objectives:  Objectives Fusarium Head Blight (Head Scab) Management Options Three Critical Management Issues:  Three Critical Management Issues Seeding: Date, Depth, Rate N Rate and Timing Fusarium Head Blight Disease Management:  Disease Management Choose disease-tolerant varieties. Rotate Crops Reduces Pythium root rot and take-all. Other disease are airborne Stagonospora, Septoria, Fusarium Rotation has less impact on these diseases. Slide6:  Fusarium Head Blight Wheat Production:  Wheat Production Kentucky Agricultural Statistics Service Slide8:  Kentucky Agricultural Statistics Service Fusarium Head Blight:  Fusarium Head Blight Pathogen: Fusarium graminearum Host: Wheat Disease: Fusaorium Head Blight (head scab, FHB) Disease Management: FHB:  Disease Management: FHB Fusarium Head Blight Symptoms visible in Feekes 11.1-11.5 Warm, moist conditions during Feekes 10.51-10.54 favor development of FHB. Disease Management: FHB:  Disease Management: FHB Fungicides: Folicur, Section 18 in KY Moderate suppression of FHB. Effective for low levels of FHB, but not for high levels of FHB. Very difficult to overcome favorable weather timed with crop stage. Varying wheat varieties/planting dates may help avoid FHB in some fields. Disease Management: FHB:  Disease Management: FHB Probably single-most damaging factor to wheat yields in Kentucky in 2003 and 2004. No apparent differences between conventional and no-till wheat. Airborne spores likely “swamp” most fields, regardless of tillage history. Variety Development:  Variety Development Variety Development:  Variety Development Dr. Van Sanford has an active program looking for Type II resistance to FHB Type II: spread of FHB in the head of wheat is slowed Some developmental lines express Type II The goal: combine Type II with yield Variety Development:  Variety Development Syngenta has reported to being close to developing a biotech wheat with resistance to FHB Would produce enzymes to fight off the pathogen Close: 2008? 2009? 2010? Disease Management Seed Fungicide Treatments:  Disease Management Seed Fungicide Treatments Combination mixes such as Raxil-Thiram or Dividend Reduce soil-born pathogens such as Pythium, Fusarium, Rhizoctonia, Septoria, and Stagonospora Improves germination rates of infected seeds (i.e. Fusarium-infected seeds) by an average of 15% Weed Management:  Weed Management Burndown Herbicides (no-till) Gramoxone Glyphosate

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