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Fungicide
* All fungicides work by coming in contact with the fungus.
* Many fungicides used for seed treatment are harmful to rhizobia.
* Most fungicides are active against a limited group of fungi
  - protectants and are used before the disease-causing agent arrives
  - specific for certain groups of fungi that cause seedling diseases
  - control only one or two groups of plant pathogenic fungi
* Some fungicide is used in the winter months, when required.
* Some fungicides have combined eradicant-protectant properties
  - provide control if applied when or just before flower buds open
  - work best if incorporated before planting
* also provide control
  - remain important despite the sun exposure
* applied at planting time can control seedling diseases on beans and peas
  - for scab control are also effective against the vein spot fungus
* are also available for the control of powdery mildew.
* are an important component in disease management
  - part of the pecan disease management program
  - available for cases of severe infection on azaleas
* are available for control of leaf rust on wheat
  - many foliar wheat diseases
  - some types of plants and situations
* are available that can be used to control diseases on turfgrasses in lawns
  - reduce disease levels
* are available to control most foliar diseases of wheat
  - the major groups of fungi
  - chemical substances which are used to kill growths of fungi
  - chemicals that are able to prevent or cure diseases caused by bacteria or fungi
  - classified in several different ways
* are effective for control when integrated with cultural practices
  - if applied early in the infection
  - when applied by air or by ground
  - where cultural practices fail to check the disease
  - either protectants or systemic
  - especially toxic to many worm species
  - helpful in severe conditions
* are important and useful in preventing and controlling powdery mildew
  - for good fruit quality including good handles
  - in suppressing damage caused by the early blight fungus
  - marketed under a bewildering assortment of trade names
* are most effective as a preventative or at first sign of disease
  - if applied when the canopy begins to close within the row
* are most effective when applied before diseases spread
  - immediately at the first signs of infection
  - in the early stages of an epidemic
  - necessary only in severe cases
* are of little value once a disease has done much damage
  - only partly effective and there is no resistance
  - preventative only
  - the primary means for managing cherry leaf spot
  - to be applied prior to fungal infection that occurs during rain periods
  - toxic to humans and deplete the ozone
* are valuable only if yield and quality are threatened by disease
  - yields and test weights are threatened by disease
* can also be useful in the control of algae
  - supplement other control strategies
* can be effective in minimizing the damage
  - management tools for lettuce diseases caused by fungi
  - part of scab management too
  - control many of the common diseases such as rust
  - partially control rust
  - reduce disease severity and increase yields
  - stop or slow the spread of a fungal disease
* containing mefenoxam are available for use by homeowners.
* have different levels of activity against different diseases
  - no effect on aphids
* help manage stalk rot indirectly through their use to treat foliar diseases.
* kill only fungi and are harmless to insects.
* kills fungus.
* offer little control to soil-contact type diseases.
* only protect healthy plant parts from infection
  - provide protection against scab on tissue that receive a direct application
* prevent infections from occurring and stop the spread of existing infections.
* protect buds on developing primocanes
  - wood from wood-degrading fungi
* provide good protection from web blight
  - protection from infection when applied before infection by fungal spores
* seem to cause little trouble for bees.
* suppress or slow down fungal growth or prevent the fungus from reproducing.
* treat disease problems.
* used to control scab are generally effective against frogeye leaf spot.
* vary enormously in their potential for causing adverse effects in humans
  - in their formulation and percent active ingredient
* work for specific diseases e.g. damping off in nursery situations etc.