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Wheat Disease Management for 2005

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Wheat Disease Management for 2005 Powered By Docstoc
					Wheat Disease
Identification 2008
Clayton A. Hollier
Department of Plant Pathology and Crop Physiology
Wheat Disease Identification 2008
   Stripe Rust
   Leaf rust
   Stem rust
   Stagonospora leaf blight/glume blotch
   Bacterial streak/black chaff
Wheat Disease Identification 2008
   Stripe rust (yellow rust)
       Cool season rust (disease development most rapid
        between 40 to 59F)
       Pustules appear on foliage producing long yellow
        stripes.
       Increasing in its importance to Louisiana wheat?
Stripe rust, wheat
Wheat Disease Identification 2008
   Leaf rust
       Develops best during moderate temperatures (60-
        80F)
       Many races (changes or shifts quite readily)
       Four 10-day cycles are all that is necessary for
        rust to develop from a few pustules to an
        epidemic.
Leaf rust, wheat
Wheat Disease Identification 2008
   Stem rust
       “Hot” season rust (79-104F)
       Very destructive in scattered locations within the
        field, but overall damage is very light statewide.
       Rarely needs fungicide application.
Stem rust, wheat
Wheat Disease Identification 2008
   Leaf and glume blotch
       Pathogen survives on crop residue
       Works from bottom of plant upward
       Spreads easily by splashing water
       Is confused with other foliar and head diseases
        (bacterial streak, tan spot, black chaff)
Leaf blotch, wheat
Glume blotch, wheat
Black chaff, wheat
Tan spot, wheat

				
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