### airborne fungal disease:

Powdery mildew
* Most powdery mildew develops as thin layers of mycelium on the plant's surface.
* affects older types of crape myrtles
  - susceptible cultivars of red, black, and purple raspberries
* appears as a slightly fuzzy white, grayish-white or gray growth on leaf surfaces
  - white mold covering harvest stems
  - during cool and somewhat cloudy conditions
  - in early spring and lale summer when nights are relalively cool
  - like flour or powder on the upper surfaces of the leaves
* are generally most severe on young
  - often severe on lilac, phlox, roses, and Monarda
  - one of the most widespread and easily recognized plant diseases
* are severe in warm, dry climates
* attacks the lower leaves of chile plants first.
* can also cause the berries themselves to wither and die off.
* can be a particular problem on late-planted squash
  - problem during changeable weather
* can be a problem in areas with poor air circulation
  - some years and some locations
  - on susceptible apple and flowering crabapple cultivars in Kansas
  - particularly severe in nurseries
  - severe on lilac, phlox, roses, current and Monarda
* can cause a white coating on leaves
  - leaf deformation, leaf drop, and flower deformation
  - premature leaf drop in some seasons
  - destroy the blossoms on crape myrtle
  - develop at very low humidity and becomes very obvious during the mid-summer
  - occur on leaves, stems, buds, and flowers
  - overwinter on infected foliage and spread to new foliage the following year
  - result in reduced vine growth, yield, fruit quality, and winter hardiness
* causes a grayish white fuzz on new leaves and flower buds
  - grayish-white, mealy growth on the leaves
  - powdery white coating on the leaves
* causes a white coating on the leaves
  - or gray growth on the leaves
  - powdery coating on the leaves
* causes a white powdery growth on leaves and blossoms
  - white, powdery mold growth on the upper surfaces of the leaves
  - forms a white coating on the leaves
  - grape leaves and vines to appear as if they have been dusted with flour
  - powdery white areas on leaves and stems
  - similar spots, but on both sides of the leaves
  - white or grayish mold
  - white, powdery, fungal growth in the absence of any leaf spotting
* coats the leaves and small branches with a white powdery growth.
* coats the leaves with a white powdery growth
* common disease name caused by several different fungi
  - of barley
  - on many types of plants
  - problem on pumpkins and winter squash
  - rose disease because it occurs in dry as well as humid weather
  - summer disease
* concern to the brewers as well as the hop industry.
* covers the undersides of the leaves with white mold.
* develops on the lower parts of crowded plants in late season
  - primarily on Kentucky bluegrass in the shade
* disease of mid- to late summer.
* disfigures leaves with a white powdery coat on the underside.
* flourish when days are warm and nights are cool and when dew forms on the leaves.
* fungal disease found throughout North America
  - that affects lilacs towards the end of summer
  - leaf disease that attacks chile plants of all ages and varieties
* fungus disease that first appears on the upper leaf surfaces of the plant.
* fungus that attacks the foliage during cool, damp periods
  - destroys much of the plants leaf area causing a reduction in yield
  - leaves a white substance on rose leaves
* infects new buds when they begin to form until they are mature.
* is also a serious threat in many fields
  - to muskmelons
  - always a bigger problem in dry climatic cycles
* is an airborne fungal disease
  - inoculum-driven disease, ie
  - unusual disease because it is favored by dry conditions
* is another disease that can mimic anthracnose
  - widely distributed and serious disease of roses
* is caused by an obligate parasite which survives on the surface of the turf
  - parasites that grow on the leaves
  - composed of fungal patches and spores
* is controlled by sulfur
  - with resistant cultivars
  - especially prevalent with poor air circulation, cool nights and damp weather
* is favored by cool nights followed by warmdays
  - cool, dry weather
  - identified by white powdery growth on upper and lower leaf surfaces
* is more common in the western growing regions
  - of a problem in the fall than in the spring
  - prevalent when cool nights follow warm days
  - severe on shaded plants
* is most common in dense, shady areas where the air circulation is poor
  - hot, humid weather
* is most common on many plants from mid- summer on
  - plants growing in shady areas
  - when cool nights are followed by warm days
  - severe in heavily shaded areas
  - now common in cucurbits
  - often a problem, especially in shady areas and sites with poor air circulation
  - one of the more serious fungal diseases
* is one of the most important diseases of cherry
  - present in all crops but is generally under control
* is prevalent in shady areas and areas that are sheltered from wind and air movement
  - on succulent growth brought about by excessive nitrogen application
  - probably the most serious disease affecting roses in Colorado
* is spread by wind and rain
  - survives on weeds, and other crops, especially cucurbits
  - still the predominant disease, but in general levels are low
* is the most common and possibly the most difficult disease to control on Euonymus
  - disease of peas, usually striking as the weather warms
  - serious disease of English peas in Texas
  - significant foliar disease
  - oldest of the fungal diseases affecting hops
  - whitish area that appears on the new leaf growth
  - unslightly and weakens plants, but they can survive it
  - usually more severe in shady areas and during cool periods
* is very common on a number of ornamentals at the present time
  - crapemyrtle
  - difficult to manage once infection is noticeable
  - easy to diagnose
  - evident in new planintgs where humidity is high
* light grey, powdery substance on the stems and petioles.
* looks like a white powder on the leaves and buds of plants.
* major disease in Kentucky bluegrass that causes problems in shade.
* makes a white coating on the leaves.
* mildew fungus that loves to live on garden phlox, lilacs and roses.
* nemesis to vineyards.
* occurs most commonly on Kentucky bluegrass in shady areas.
* occurs on a wide variety of turfgrass species wherever turfgrasses are grown
  - all groups of oaks
  - leaves, stems and fruits
  - the green shucks and occasionally leaves of most pecan varieties
  - sporadically on soybeans
  - to some extent every year
  - wherever apples are grown
  - worldwide in cool, humid, and semiarid areas where cereals are grown
* perennial problem in grapes.
* problem on some deciduous azaleas.
* produces a grayish white coating on the stems and leaves of infected plants
  - powdery, whitish coating on the leaves and other plant parts
  - ash-grey spores on leaves
* reduces photosynthesis and the plants ability to store adequate carbohydrates.
* shows up as white, dusty spots on both the top and undersides of leaves.
* starts as a white coating on leaves and flowers
  - small white spots on leaves
* tends to more of a problem on plants that are overcrowded.
* very common plant disease among the berry family.
* white to grayish powdery growth on the upper surfaces of leaves.