Organic Vs Potent Garden Treatments

Credit: Lane Tredway: Pyriculria grisea: fescues, kikuyugrass, ryegrasses, St. Augustinegrass: irregular blighted spots of turf with bleached areas with dark margins on leaves; ryegrass develops a fishhook look: daytime temperatures of 8595F; high humidity or rains; overwatered and overfertilized turf: water effectively; don't overfertilize; lower shading; boost air movement: fungicides are offered, however cultural controls are more useful Fusarium spot damage to bentgrass grass.

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McCain: Microdochium nivale: annual bluegrass, bluegrasses, fescues, ryegrasses, zoysiagrass: circular spots of 12 inches that can increase the size of to 12 inches; leaves initially appear watersoaked, then reddish brown, and finally bleached; minute, gelatinous spore masses in some cases seen on dead leaves; white or pinkish fungal threads might be seen in morning; more widespread in Central and Northern California: consistently cool temperature levels (4065F) and damp conditions; high nitrogen applications in fall; neutral or alkaline soil pH; pathogen survives in lawn residues: minimize shade and improve soil aeration and water drain; water appropriate length of time; avoid excess nitrogen, especially in fall; keep soil pH between 6.56.7.

Credit: M. Ali Harivandi: Bipolaris spp. and Helminthosporium spp.: bermudagrass, bluegrasses, fescues, kikuyugrass, ryegrasses, zoysiagrasses: circular to elongated brownish areas with brown centers and dark brown or purple borders on leaf blades, sheaths, and stems; crowns and roots regularly have a dark brown rot; crown-infected plants might die in hot, windy weather condition, leaving thinned areas throughout the grass; spores are windborne: warm temperatures (7090F) for bluegrasses, ryegrasses, and fescues; cool temperature levels (6070F) for bermudagrass and zoysiagrass; high humidity; low clipped turfgrass; most serious with excess nitrogen fertilization or shortage: reduce shade; enhance soil aeration and water drain; prevent dry areas and excessive nitrogen fertilizer; maintain as high a cutting height as possible: fungicides offered however often not warranted Pythium blight (grease area), triggered by Pythium sp., on a ryegrass and bluegrass yard.

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Ali Harivandi: Pythium spp.: all turfs: small, circular areas (26 inches) that run together; blackened leaf blades rapidly wither, turn reddish brown, lie flat, stick together, and appear greasy; roots may be brown; in humid conditions, masses of fungal mycelium may appear: low spots that stay wet; warm temperature levels (8095F daytime, > 68F night time); makes it through as spores in soil for extended periods: lower shading; improve soil aeration and water drain; water suitable length of time; prevent cutting damp lawn and applying high levels of nitrogen during hot, humid weather condition: fungicides offered however mainly avoided by cultural practices in California Patches of high fescue turfgrass contaminated with Rhizoctonia blight.

Organic Vs Chemical Garden Treatments

Credit: Arthur H. McCain: Rhizoctonia solani AG 2-2LP: bermudagrasses, kikuyugrass, St. Augustine lawn, zoysiagrass: very first appears as small, irregular brown patches or rings that can increase the size of to numerous feet in diameter; centers might recuperate leading to rings of diseased turf; leaves and sheaths end up being watersoaked, wilt, turn light brown, and pass away; plants pull out easily from soil with rotten stolons, in light invasions, roots usually not contaminated and plants frequently recover; soil-inhabiting fungi that forms fine, fungal threads in soil or on turfgrass: excess thatch and mat in addition to cool temperature levels (6070F); wet soil conditions: decrease shading and improve soil aeration and water drainage; water proper length of time to a depth of 46 inches; prevent excess nitrogen in the fall; maintain thatch less than 1/2 inch: fungicide useful if disease serious in previous Red thread damage to grass foliage.

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McCain: Laetisaria fuciformis: bentgrasses, bermudagrasses bluegrasses, fescues, ryegrasses: red thread might eliminate turfgrass in spots that are 28 inches in diameter, or the illness may occur over large locations without eliminating the plants; pink web of fungal threads bind the leaves together; look for pink, gelatinous fungal crusts predicting from the leaves to assist identify this disease: common under conditions of moderate air temperature levels (6075F) and extended durations of leaf moisture; often appears on plants lacking in nitrogen throughout periods of cool or warm temperature levels if there is appropriate wetness (e.g., excess irrigation or rainfall): proper irrigation and fertilization can reduce the incidence; appropriate nitrogen normally can avoid this disease from occurring; prevent dry spell tension by watering turfgrass based upon evapotranspiration needs of the turfgrass; offer appropriate air flow; decrease shading: fungicides hardly ever called for other than in severe cases Rust damage to bluegrass foliage.