College of Agriculture and Life Sciences

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Anthracnose Stalk Rot Resistancefrom GEM
Germplasm

• Margaret Smith
• Department of Plant Breeding
• Cornell University

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Anthracnose Stalk Rot

• Colletotrichum graminicola (Ces.) G.W. Wils.
• Increased lodging, reduced yield
• Best control through resistant varieties
• Limited resistance in temperate germplasm

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Overall Project Objective

• Develop temperate-adapted maize inbreds
• with both anthracnose stalk rot resistance and
• good yield potential
• from GEM breeding populations

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Selection and Breeding Scheme
Evaluate 30 populations for ASR resistance
Testcross and evaluate yield potential and
adaptation
Self pollinate and screen for ASR resistance
Testcross to monitor yield and adaptation
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Selected Populations

1. FS8B(T)N1802
2. CH04030S0906
3. AR01150N0406
4. GOQUEENN1603

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Means by source population for anthracnose stalk
rot ratings, 2001
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Yield Data - 2 locations, 2001
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Yield Data - 1 location, 2001
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Work done in 2002

• S6 progenies planted ear-to-row
• Greater emphasis on yield performance
• Greater tolerance of stalk rot resistance
• Testcrosses made to
• Previously used public line crosses
• Holdens testers (LH176/LH177, LH198)

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Anthracnose Stalk Rot Resistance in a Few GEM
Inbreds, 2002
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FS8B(T)N1802 15-255
DE811ASR B37
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FS8B(T)N1802 15-255
DE811ASR B37
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Yields of a Few GEM Inbreds Tested on B73/CD1,
2001, 2002
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Work done in 2003

• S6 progenies and their testcrosses (public and
  Holdens testers) evaluated for anthracnose stalk
  rot resistance (2 reps)
• Testcrosses evaluated in yield trials in 3 New
  York locations (2 reps/location)
• Results just in from the field -- stay tuned!

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Thank you!
Questions?