Soybean Diseases and other stuff.

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Soybean Diseasesand other stuff.
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Three disease principles

• 1. Pathogen present or introduced.
• 2. Susceptible host.
• 3. Environment for growth.

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Examples of soybean diseases.
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Soybean cyst nematode
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Soybean cyst nematode.
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Root knot nematode
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Reniform nematode
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Phytophthora root rot
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Stem canker!
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Stem canker!
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Sudden death syndrome (SDS)
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Sudden death syndrome (SDS)
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Charcol rot
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Pod and stem blight
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Anthracnose
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Frogeye leaf spot
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Frogeye leaf spot
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Cercospora leaf blight
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Cercospora leaf blight
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Downy mildew
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Brown spot
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Aerial web blight
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Bacterial blight
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Bacterial pustule
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Soybean Asian rust
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Soybean Asian rust
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Disease like problems.
Cl toxicity
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Disease like problems.
Soil crusting
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Disease like problems.
Frost burning
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Disease like problems.
Hail damage
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Disease like problems.
K deficiency
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Disease like problems.
Lightning!
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Disease like problems.
Sencor damage
Herbicide injury.
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Disease like problems.
Sunburn (should have used sunscreen!)
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Disease management

• Know potential problems ahead of crop.
• Variety selection.
• Good, certified, treated seeds.
• Crop rotation (cotton good rice fair).
• Dont overseed.
• Soil incorporation of residue.
• Good agronomic practices.
• Fungicides when warranted.

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Fungicide use.

• 40 bu/acre yield potential.
• Good soil, irrigated.
• Good prices, above 5.50/bu.
• Disease present.
• Commercial seed crop on contract.
• R3 growth stage.
• Favorable environment.
• Someone else is paying for it!

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Three types of fungicides.

• Protectant/Preventative
• Strobilurin (Quadris, Headline)
• Curatives
• Triazoles (Tilt, Domark, Folicur, Bumper, Laredo,
  Propimax)
• Combinations
• - (Stratego, Quilt, Pristine)