Pest Control

Last updated on February 23, 2014

Weeds

Insects

Diseases

Weeds

Methods of Disease and Insect Control

GENETIC CONTROL
  • Resistant Varieties
  • Grow one or several pure line varieties
  • Multiline varieties have a mixture or blend of several resistance genes
AGRONOMIC CONTROL
  • Crop rotations
  • Good planting practices - planting date, rate, etc
  • Weed Control - before & after planting
  • Use clean seed
  • Destruction of residues - more of a problem with conservation tillage
  • Destruction of alternate hosts Buckthorn - CR Barberry - SR
CHEMICAL CONTROL
  • Fungicides - Tilt, Bayleton, Dithane, etc
  • Seed treatments - Vitavax, Captan, etc Insecticides for specific insect problems

Insects

Hessian fly 

Seed winter wheat when the danger of APHID and HESSIAN FLY infestation is past

Aphids and Barley Yellow Dwarf

Diseases

Disease resistance tends to break down at high fertility levels, so FUNGICIDES are an important component of ICM Types of fungicides 

Determining the "ECONOMIC THRESHOLD" for applying fungicides is difficult

  • If diseases develop late, a heavy infection may not reduce yield and quality of grain significantly

  • If diseases develop early, quality and quantity of grain yield can be reduced significantly

  • Some diseases reduce yield and quality more extensively than others. If diseases that are known to cause significant reductions in plant performance develop by 10 days to 2 weeks after heading, spraying with fungicides is likely to be profitable
SEED TREATMENT FUNGICIDES

Protect against seed-borne and soil-borne diseases - Vitavax, Apron, Enhance, Maneb, etc

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FOLIAR FUNGICIDES

  • PROTECTANTS will protect plants from infection, but will not eradicate a disease if it is already in the plant
  • ERADICANTS (SYSTEMIC FUNGICIDES) will eradicate a disease if it is present in plants and will protect plants from subsequent infection depending on rate of application. Tilt and Bayleton are examples of SYSTEMIC FUNGICIDES

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Fungicides differ in effectiveness on specific diseases

  • Ex: Rusts and mildew - Bayleton is more effective than Dithane M-45
  • Septoria - Dithane M-45 is more effective than Bayleton

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