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Garden Word of the Day

Fungicide

1/26/2016

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Fungicides are chemicals or organisms that kill or inhibit fungi and fungal spores. Since fungal diseases are responsible for more agricultural losses than any other cause, knowing how to fight these organisms is important.


Fungicides work in one of three ways:

  • Direct contact - only works where it comes in contact with the plant
  • Translaminar - absorbed through upper leaf surfaces and moved to lower surfaces
  • Systemic - absorbed into the vascular bundle and moved throughout the plant in the xylem


Sulfur is a common component of most fungicides, as are neem, rosemary, and jojoba oil. Beneficial bacterium (Bacillus sabtilis) and fungus (Ulocladium oudemansii) are also added. Fungal plant diseases include:
  • alternaria Blight (Early Blight)
  • phytophthora blight (Late blight)
  • cytospora canker
  • nectar canker
  • rust
  • anthracnose (bird’s-eye spot)
  • club root
  • damping-off
  • downy mildews
  • powdery mildew
  • galls
  • leaf blister
  • leaf curl
  • leaf spots
  • blackspot
  • scabs
  • smuts
  • Fusarium wilt
  • Verticillium wilt

Unlike most of these fungal diseases, Fusarium and Verticillium wilts cannot be controlled with fungicides.

While the use of fungicides can be effective, prevention is a better course of action. One way to reduce the chance of fungal infections is to plant resistant varieties. Another way to avoid fungal infestations is to improve air flow with good pruning, avoid watering from above, which may splash fungal spores onto nearby plants, and by removing and destroying any diseased plant tissue. Ensuring good drainage is another way to reduce the need for fungicides.
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