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	Pest Diagnostic Clinic, Factsheet on Powdery Mildew
		The attractive colour of green foliage may be spoiled by the growth of the white powdery mildew fungus on the surface.
		All of the powdery mildew fungi are spread as spores by the wind.
		Throughout the season powdery mildew fungi produce mycelium and spores on the surface of infected foliage.
	www.uoguelph.ca /pdc/Factsheets/Diseases/PowderyMildewinGarden.htm (675 words)

	Powdery mildew - Wikipedia, the free encyclopedia
		Powdery mildew is a fungal disease that affects a wide range of plants.
		Erysiphe necator (or Uncinula necator) causes powdery mildew in grapes.
		Blumeria graminis, the fungus that causes powdery mildew in grasses, can persist between seasons in wheat stubble that is left in the field, or in wheat that is left to overwinter.
	en.wikipedia.org /wiki/Powdery_mildew (305 words)

	Wheat Powdery Mildew (Site not responding. Last check: 2007-10-25)
		Powdery mildew on wheat is recognized by small, effuse patches (colonies) of cottony mycelia (masses of fungal threads of hyphae that make up the body of the fungus).
		As the wheat and the mildew colonies mature, the sexual stage of the fungus or cleistothecia are produced.
		The mildew fungus survives the summer in the absence of wheat in infested wheat debris in the cleistothecia.
	www.ppws.vt.edu /stromberg/smallgrain/biology/wpmildew.html (248 words)

	Ipm Powdery Mildew Resource - Ipm Powdery Mildew Data (Site not responding. Last check: 2007-10-25)
		Powdery mildew on foliage and powdery mildew on roses.
		Powdery mildew is a common disease of cucurbits under field and greenhouse conditions in.
		A hand lens, are part of the white, powdery appearance of powdery mildew fungi and are produced in chains on upper or.
	www.mildew-answers-online.info /ipm-powdery-mildew.html (777 words)

	Powdery Mildews
		Powdery mildew is one of the most widespread and easily recognized plant diseases.
		Powdery mildews are characterized by spots or patches of white to grayish, talcum-powder-like growth.
		In Colorado, powdery mildews are common on ash, lilac, grape, roses, turfgrass, vegetables (such as cucurbits and peas), euonymus, cherry, apple, crabapple, pear and Virginia creeper, among others.
	www.ext.colostate.edu /pubs/garden/02902.html (772 words)

	Sugarbeet Powdery Mildew
		The first observation of powdery mildew of sugarbeet in Minnesota and North Dakota was in the Renville area in southern Minnesota on Sept. 4, 1975.Within two weeks, it was found as far north as Grand Forks.
		When inspecting a field for powdery mildew, look in the areas of the field that are beginning to turn a light green or yellow green due to depletion of available nitrogen.
		Powdery mildew is not likely to be found in the rest of the field if it cannot be found in the yellowing areas.
	www.sbreb.org /brochures/Mildew/index2.htm (1755 words)

	Powdery Mildew of Vegetables (Site not responding. Last check: 2007-10-25)
		Powdery mildew is a serious disease of beans, southern peas, okra, squash, cucumbers, muskmelons, honeydews, and pumpkins in Florida.
		Powdery mildew of okra, squash, cucumbers, muskmelons, honeydews, and pumpkins is caused by the fungus Podosphaera xanthii (Sphaerotheca fulginea).
		Powdery mildew of strawberries is caused by the fungus Sphaerotheca macularis.
	edis.ifas.ufl.edu /VH014 (790 words)

	Laboratory Exercises in Plant Pathology - Identification of Powdery Mildew Fungi (Site not responding. Last check: 2007-10-25)
		Powdery mildew fungi are obligate, biotrophic parasites of the phylum Ascomycota of Kingdom Fungi.
		Hyphae and conidia of powdery mildew on the surface of a grape leaf.
		At the end of the growing season, powdery mildew fungi produce sexual spores, known as ascospores, in a sac-like ascus (pl. asci) enclosed in a fruiting body called a chasmothecium (pl. chasmothecia) (cleistothecium is a former term for this structure that is still widely used).
	www.apsnet.org /education/LabExercises/PowderyMildew/Top.html (1226 words)

	Powdery mildew
		Powdery mildews are one of the most common and easily recognized diseases to occur in Colorado.
		Powdery mildew is a fungus that grows well in arid climates, such as Colorado's.
		Powdery mildew is not always easy to control, but you can do several things to manage the disease.
	www.colostate.edu /Depts/CoopExt/4DMG/Pests/Diseases/mildew.htm (430 words)

	Mildew
		Powdery mildew is one of the oldest plant diseases known to man -- the ancient Greeks described it, and several books in the Old Testament speak of its effects.
		The most favorable conditions for powdery mildew are nighttime temperatures of 60F and relative humidity of 90 to 99%, with 80F temps and 40 to 79% relative humidity during the days -- conditions common in late spring and early fall.
		Downy mildews like it cool and moist, making them most troublesome in the eastern and northern areas of the U.S. Under humid, cool conditions, spores appear copiously on the lower surfaces of leaves, growing in tree-like formation on branched fruiting structures, unlike the powdery mildew spores, which are produced in chains.
	www.iserv.net /~wmize/mildew.htm (1325 words)

	The Ventura County Rose Society - Powdery Mildew
		While it seems that we live in the powdery mildew capital of the world, the reality is that the disease is present wherever there are roses.
		Powdery mildew on roses is caused by a parasitic pathogen-Sphaerotheca pannosa var.
		The biopesticide is derived from the jojoba (pronounced ho ho ba)-a shrub native to the Sonoran desert.
	www.venturarose.org /article-powdery-mildew.htm (854 words)

	APSnet Education Center - K-12 Lessons and Laboratories - Powdery Mildew Fungi: Classification and Ecology (Site not responding. Last check: 2007-10-25)
		Powdery mildew fungi are ideal for use in a laboratory exercise on fungal classification, fungal spore types, host-parasite interaction during an ecology unit, or a study of host range.
		Since powdery mildew fungi reproduce by means of two spore types: asexual spores (conidia) and sexual spores (ascospores), discussions of the types of reproduction in fungi would be facilitated.
		Recently, Saenz and Taylor (1999) have proposed that powdery mildew genera be reclassified according to the phylogeny (an estimate of evolutionary relationships) inferred from the DNA sequence of the ribosomal ITS region and a number of morphological characteristics.
	www.apsnet.org /education/K-12PlantPathways/TeachersGuide/Activities/PowderyMildew/exercisepg1.htm (1072 words)

	Powdery Mildew
		Powdery mildew is a common fungal disease of a variety of ornamental plants.
		Grayish white, powdery blotches on leaves, stems and buds are the primary sign of powdery mildew.
		Powdery mildew is usually most severe on young, succulent growth, the sort that excessive nitrogen promotes.
	lancaster.unl.edu /hort/Articles/2004/PowderyMildew.shtml (416 words)

	Department of Plant Pathology Ornamental Disease Fact Sheets
		Powdery mildew occurs on many different flowers, woody ornamentals, and trees including roses, snapdragons, African violets, kalanchöe, English ivy, zinnias, photinia, oak, lilac, and begonias.
		All the powdery mildew fungi are obligate parasites, requiring live tissue to grow and reproduce.
		Some powdery mildew are inhibited by free moisture on leaves while others are favored by wetness on leaf surfaces.
	www.ppath.cas.psu.edu /EXTENSION/PLANT_DISEASE/pmildew.html (484 words)

	Powdery Mildew (Site not responding. Last check: 2007-10-25)
		Powdery mildews are common on ash, lilac, grape, roses, turfgrass, vegetables (such as cucurbits and peas), enonymus, cherry, apple, crabapple, pear, and virginia creeper, among others.
		Powdery mildews are characterized by the appearance of spots or patches of white to grayish, talcum powder-like growth.
		Powdery mildews are host specific, they cannot survive without the proper host plant.
	cecalaveras.ucdavis.edu /powder.htm (652 words)

	Powdery Mildews on Ornamental Plants, HYG-3047-96
		Although the fungi that cause powdery mildew are usually different on different plants, all of the powdery mildew diseases are similar in appearance.
		Powdery mildews, as the name implies, often appear as a superficial white or gray powdery growth of fungus over the surface of leaves, stems, flowers, or fruit of affected plants.
		Most powdery mildew fungi produce airborne spores and infect plants when temperatures are moderate (60 to 80 degrees F) and will not be present during the hottest days of the summer.
	ohioline.osu.edu /hyg-fact/3000/3047.html (765 words)

	Sugarbeet Powdery Mildew
		Mildew may even appear on the upper leaves that have not completely expanded when the disease is severe.
		When inspecting a field for powdery mildew, look in the areas of the field that are beginning to turn light green or yellow green in color due to depletion of available nitrogen.
		Powdery mildew is caused by the fungus, Erysiphe polygoni (formerly Erysiphe betae).
	www.ext.nodak.edu /extpubs/plantsci/pests/pp967w.htm (1001 words)

	Powdery Mildew (Site not responding. Last check: 2007-10-25)
		This means that the powdery mildew fungus that attacks roses isn’t the same as the one that attacks sycamore...
		A powdery mildew infection on plant tissues creates white to gray-white spots or areas on the surface of leaves, shoots, buds, or fruit.
		However, powdery mildew is not typically a serious problem in most area gardens and landscapes.
	treesforyou.org /Planting/InsectsandDisease/Diseases/powdery_mildew.htm (1087 words)

	Powdery Mildew of Cucurbits fact sheet
		Powdery mildew is a common disease of cucurbits under field and greenhouse conditions in most areas of the world.
		Powdery mildew develops quickly under favorable conditions because the length of time between infection and the appearance of symptoms is usually only 3-7 days and a large number of conidia can be produced in a short time.
		Powdery mildew development is arrested at daytime temperatures of 100°F or higher.
	vegetablemdonline.ppath.cornell.edu /factsheets/Cucurbits_PM.htm (1348 words)

	Powdery Mildew (Site not responding. Last check: 2007-10-25)
		Powdery mildew pathogens are readily disseminated in the air by air currents.
		Some powdery mildew pathogens are enhanced by fluctuations between warm and cool temperatures but a relative humidity of 85% is generally needed for disease to develop.
		Powdery mildew diseases are very common to a number of greenhouse crops and are easy to diagnose by the development of an obvious white powder on the plant surface.
	hortipm.tamu.edu /pestprofiles/disease/powder/powder.html (195 words)

	ODIN004 - Powdery Mildew of Ornamentals and Shade Trees
		A powdery, fluffy white to light gray-colored fungus growth on succulent stems, leaves, buds and flowers is the characteristic symptom of powdery mildew.
		The white mildew on the plant surface is actually composed of the threads (mycelium) and asexually produced spores (conidia) of the powdery mildew fungus.
		Some powdery mildew fungi survive the winter as colonies of mycelium, but many switch over to sexual reproduction in the fall, producing minute brown to fl specks amid the old mycelium on the dying leaf or other plant part.
	www.ces.ncsu.edu /depts/pp/notes/Ornamental/odin004/odin004.htm (692 words)

	Powdery Mildew on Vegetables Management Guidelines--UC IPM (Site not responding. Last check: 2007-10-25)
		Powdery mildews generally do not require moist conditions to establish and grow, and normally do well under warm conditions; thus they are more prevalent than many other leaf-infecting diseases under California's dry summer conditions.
		Powdery mildew first appears as white, powdery spots that may form on both surfaces of leaves, on shoots, and sometimes on flowers and fruit.
		An exception is one of the powdery mildews that affects artichokes, onions, peppers, and tomatoes: it produces yellow patches on leaves but little powdery growth.
	www.ipm.ucdavis.edu /PMG/PESTNOTES/pn7406.html (1466 words)

	Powdery Mildew of Grape, HYG-3018-94
		Powdery mildew is an important disease of grapes throughout Ohio.
		Powdery mildew is caused by the fungus Uncinula necator.
		In the spring, airborne spores (ascospores) released from the cleistothecia are the primary inoculum for powdery mildew infections.
	ohioline.osu.edu /hyg-fact/3000/3018.html (1002 words)

	APSnet Education Center - K-12 Lessons and Laboratories - Powdery Mildew Fungi: Classification and Ecology (Site not responding. Last check: 2007-10-25)
		Powdery mildew fungi are obligate parasites (biotrophs) because they cannot be cultured on nutrient media, but require a living host plant.
		The powdery mildew fungus produces a specialized absorption hypha called a haustorium (pl. haustoria) within the cell of a host plant to obtain food from the plant cell.
		The asexual (imperfect) stage of powdery mildew fungi is the spore known as a conidium (pl. conidia).
	www.apsnet.org /education/K-12PlantPathways/TeachersGuide/Activities/PowderyMildew/lessonplan.htm (732 words)

	Genetic Research
		Powdery mildew is a common fungal pathogen of sweet cherries.
		Powdery mildew is commonly seen on tree foliage during the growing season (Figures 1,3), and fruit infection is most often seen in orchards with high incidence and severity of foliar infections (Figure 2).
		Segregation for powdery mildew resistance within the progeny populations for these crosses also indicated a single gene was responsible for the resistance.
	www.hrt.msu.edu /faculty/Langg/Sweet_Cherry_Genetic_Research.html (726 words)

	Canola Powdery Mildew Resource \| Canola Powdery Mildew Web-Site (Site not responding. Last check: 2007-10-25)
		Powdery mildews of canola and mustard are caused by the fungi erysiphe polygoni and e.
		It's bad enough as it is, with roses beaten down by the rains, lilacs with powdery mildew and earwigs in the lettuce.
		Powdery mildew prevalent on foothill oaks this year - Powdery mildew prevalent on foothill oaks this year Powdery mildew, a group of fungi that causes a white, flour-like growth on the surface of leaves, is common on roses, begonias, grapes and many other
	www.mildew-answers-online.info /canola-powdery-mildew.html (858 words)

	Powdery Mildew
		Powdery mildew is a fungal growth, generally white and powdery that appears on the leaves.
		Powdery mildews are host specific— they can't survive without the proper host plant.
		Powdery mildew appears as a dusty white to gray coating over leaf surfaces or other plant parts.
	www.landscape-america.com /problems/diseases/powderymildew.html (752 words)

	Keeping Ahead of Powdery Mildew \| Garden Pest Tip
		Powdery mildew is a common disease on many types of plants.
		The optimum temperature for infection is between 68 to 77 degrees F and relative humidity between 40 to 100% is sufficient for the spores to germinate.
		Sulfur is highly effective against powdery mildew if used in a protectant program with a minimum of 7 to 14 days between applications.
	www.gardenguides.com /articles/powderymildew.htm (588 words)

	Powdery Mildew (Site not responding. Last check: 2007-10-25)
		Powdery mildew is a fungal disease found throughout North America.
		In gardens and orchards powdery mildew is commonly found on peas, cucumbers, squash, strawberries, raspberries, apples, and cherries.
		In areas where powdery mildew is a chronic and severe problem in fruit trees, a preventative spraying program should begin in spring, with weekly applications of a fungicide such as lime sulphur to prevent establishment of the disease.
	entomology.montana.edu /extension/disea020.htm (584 words)

	Powdery Mildew
		If powdery mildew has been a problem in the past, choose a variety that has some resistance to the disease.
		The fungi which cause powdery mildew are spread by spores produced in the white patches.
		Management of powdery mildew on fruit trees may be combined with the normal spray schedule and should begin at the green tip bud stage for apples.
	plantclinic.cornell.edu /FactSheets/powdery/powdery.htm (1100 words)

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