Ophiobolus patch

Ophiobolus Patch Disease Take All Patc

  1. Ophiobolus starts as a small slightly sunken patch in the lawn which is accompanied by tell-tale browning, followed by yellowing of the grasses. The patch can be as much as 2metres across in the first year of infection. Finer grasses die out in the centre of the patch, but coarser grasses will probably persist - together with some weeds
  2. Ophiobolus Patch Disease : Take All Patch : Brown and Yellow Patches on the Lawn. Ophiobolus is a fatal disease, so obviously - as with all things fatal - prevention works far better than cure! The good news is, that is is probably one of the least common of lawn diseases for it normally affects grasses in the Bent group, and is usually.
  3. Ophiobolus patch cannot be controlled with cur­ rently available turf fungicides. The best control at present is the use of ammonium sulfate fertilizer as a source of nitrogen, applied in a balanced nu­ tritional program with phosphorus and potassium. (Another turf disease, Fusarium patch, is also less FIG. 1
  4. is / Ophiobolus) What Is It? Take-all Patch is a fungal disease that attacks the roots and crowns of plants, causing turf to die in a circular pattern.. Have I Got It? The name 'patch' disease is used because of the symptoms experienced when Take-all is present

Ophiobolus Patch Disease Take All Patch Gardenseeker

  1. Take all patch (formally known at Ophiobolus Patch) is a severe fungal disease that can cause major damage to your lawn. Thankfully, it's not very common but if it's not treated quickly it can take hold and be very difficult to control
  2. Ophiobolus patch of Agrostis for take-all decline (Baker and Cook, 1974; Shipton, turfgrass, a disease similar to wheat take-all and 1975) and the Fusanum-suppressive soils (Smith and ^^ ^ ,^ ^ ^^ ^^ ^^ Snyder, 1971; Toussoun, 1975, Alabouvette et al., ^ controlled in greenhouse experiments by using a 1979)
  3. Symptoms. - A small sunken area in brent type grass lawns. It grows each year to create a larger patch with a bleached ring around the dead area. The central patch then becomes seeded with weeds and coarse grasses. To view care instructions for this problem please or register. Discuss Ophiobolus patch with other Shoot members
  4. However, by 1964, Ophiobolus patch was much more severe in the 5.9 kg of N plots than in those receiving 2.9 or 9.8 kg of N. Phosphorus had little effect on the disease in 1961, but by 1964 plots.

Take-all patch is caused by the fungus Gaeumannomyces graminis. It occurs on all species of bentgrass in temperate climates throughout the world. It is most severe on newly established creeping bentgrass stands, and is rarely seen on undisturbed turf greater than ten years old. Symptoms appear in late spring or early summer as small, circular, light brown to reddish brown patches. These. The incorporation of avirulent fungi such as Gaeumannomyces graminis var. graminis, an avirulent isolate of G. graminis var. tritici, a Phialophora sp. with lobed hyphopodia synonymous with Phialophora radiciola var. radicicola sensu Deacon and P. radicicola var. graminicola at the time of seeding Agrostis turf in pots of sterilised soil completely controlled Ophiobolus patch disease known as Ophiobolus patch) is an extremely destructive dis-ease of bentgrass, caused by the fungus Gaeuannomyces graminis var. avenae. Peter H. Dernoeden is associate pro-fessor of agronomy in the college of Agriculture at the University of Mary-land in College Park Phialophora radicicola is present in large amounts in most grasslands in Britain and probably restricts the occurrence of Gaeumannomyces graminis var. avenae, the cause of ophiobolus patch disease.Its absence from turf of low pH (< c. 4-5) could explain why such turf often develops the disease after liming. High water content of turf is also associated with the disease, but does not seem to. Ophiobolus patch disease Research Report of A n Forus Taluntais (Plant Sciences and Crop Husbandry Section), p. 45 Effects of wheat field soil on inocula of G. graminis (Sacc.) Arx and Olivier var.

Take-All Patch (Gaeumannomyces Graminis / Ophiobolus

Gaeumannomyces graminis (Sacc.) Arx & D.L. Olivier (Take-all Patch Disease, Ophiobolus Patch (Causative Agent Suppression of wheat take-all and ophiobolus patch by fluorescent pseudomonads from a fusarium-suppressive soil Author links open overlay panel P.T.W. Wong ∗ R. Baker Show mor Ophiobolus patch disease developed rather quickly on young bentgrass turf after an initial methyl bromide fumigation. The disease occurred at random in 1961, but generally was much worse on plots receiving 9.8 kg of N per 100 m 3 per season, regardless of P and K levels, than on plots receiving less or no N. However, by 1964, Ophiobolus patch was much more severe in the 5.9 kg of N plots than. the case of Ophiobolus patch disease and red thread. Our results have shown on putting green turf that 12 pounds of ni,trogen, four pounds of phosphorus (P205) and eight pounds of potas-sium (K20) per 1,000 sq. ft. per season have given us best results. Lik,ewise, on less intensely managed areas, such as good quality lawns o Patches once established continue to spread throughout the year. Stressed grass appears bronze to reddish brown and then fades to a dull brown. During winter affected patches turn grey. In pure Bentgrass stands a circular or ring-shaped dead spot occurs. Patches may enlarge (up to 15cm a year) to reach diameter of 1m or more

Take All Patch: How to Identify it, Remove it & Prevent if

[Gaeumannomyces graminis] Situation: Formerly known as Ophiobolus patch, Take-all patch is a disease of cool season turf particularly Bentgrass.. Turf Damage: Initial patches often resemble fusarium patch; however, they continue to develop after fusarium has ceased in late spring. Patches can range from 10cm to an area covering three metres. Occurrence: Most severe in cool wet years on poorly. Gaeumannomyces Patch BY J. M. VARGAS, JR., Principal Investigator Supporting Investigators: MSU Turf grass Faculty Gaeumannomyces patch or take-all patch formerly known as Ophiobolus patch, occurs in many regions of the United States, but has typically been associated with the Pacific Northwest. Monteith and Dahl in 1932 implicated the fungu In 1937, the first turf disease caused by a root pathogen (Ophiobolus graminis) was described in Holland and named Ophiobolus patch. In subsequent years, the name of the pathogen was changed to Gaeumannomyces graminis var. avenae and the disease was re-named take-all patch (Gaeumannomyces patch would have been a tongue-twister) Take-all patch is caused by the fungus Gaeumannomyces graminis, formerly known as Ophiobolus graminis - hence its former common name of ophiobolus patch. It first appears as small circular patches, expanding to around 50cm to 100cm (20in to 40in) in diameter. It tends to affect bent and other fine-leaved grasses producing dying areas of straw.

Rasenkrankheiten | Ursachen, Vorbeugung, Bekämpfung | Ein

Ophiobolus graminis var. Avenae and Fusarium patch disease caused by Fusarium nivale are the two major turfgrass diseases in a large part of the Pacific Northwest. Sulfur has eleminated all Ophiobolus patch disease regardless of N,P and K treatments, while there are no known fungicidal controls for this problems. Fusarium patch diseas Name Language; crown sheath rot of rice: English: ophiobolus patch: English: patch disease of turf: English: take-all of cereals: English: whiteheads of grasse

However, by 1964, Ophiobolus patch was much more severe in the 5.9 kg of N plots than in those receiving 2.9 or 9.8 kg of N. Phosphorus had little effect on the disease in 1961, but by 1964 plots treated with 0.86 kg of P had only 15% as much infection as those receiving 0 P. Potassium exhibited a suppressing effect on the amount of disease. A Take-all is a relatively uncommon disease that attacks the roots of grasses, killing the plants. It is caused by the fungus Gaeumannomyces graminis. This was previously known as Ophiobolus graminis, hence the alternative name, ophiobolus patch. Caption: Take-all attacks grass roots, causing dead patches in the lawn Take-all is a plant disease affecting the roots of grass and cereal plants in temperate climates caused by the fungus Gaeumannomyces tritici (previously known as Gaeumannomyces graminis var. tritici). All varieties of wheat and barley are susceptible. It is an important disease in winter wheat in Western Europe particularly, and is favoured by conditions of intensive production and monocultur

Fusarium blight, powdery mildew, Fusarium patch, Pythium blight, dollar spot, brown patch, Ophiobolus patch, and Typhula blight (Beard 1973). Services: Commercial availability and cost: Kentucky bluegrass is commercially available. Seeds cost only slightly more than tall fescue, perennial ryegrass, and fine fescues. Over a large area th We Offer a Wide Range of Paper Bags & Polybags to Suit Your Business Needs. Browse Our Full Range Online or Give Us a Call Today for More Information Formerly known as ophiobolus patch, Take-all patch is a disease of cool season turf particularly bentgrass. Initial patches often resemble Fusarium patch; however, they continue to develop after Fusarium has ceased in late spring. These patches appear slightly reddish-brown in colour to begin and then the turf will die away, to be replaced by. See: Wheat (Triticum aestivum)-Take-all. Cause Gaeumannomyces graminis var. graminis (formerly Ophiobolus graminis), a fungus that overwinters on turf debris and in the perennial portions of the grass plants.It is a wet-weather disease, spreading from plant to plant by growing over roots, rhizomes, and other plant parts and by adhering to equipment

Suppression of wheat take-all and ophiobolus patch by

  1. us. Description: A fungal disease of turf that causes large, yellow to brown circular patches in turf that show with the first hot days of spring. The roots are rotted and stunted and the symptoms of yellowing and browning are due to water stress
  2. al involvement. 940-260-7023 This immature was interested then check back
  3. is, formerly Ophiobolus gra
  4. Ophiobolus patch. When Merion Kentucky Bluegrass is short of sulfur, it is much more susceptible to powdery mildew. Dollarspot fungus in warm-season grasses in Florida was reduced by the use of sulfur in fertilizers. This may be a bit hard for many to believe, but data from the Pacific N.W. shows that adequate sulfur prevented Po

Plant Disease - Ophiobolus patch - Shoo

Factors affecting Occurrence of the Ophiobolus Patch

Take-all Patch (Gaeumannomyces graminis) Situation: Formerly known as Ophiobolus patch, Take-all patch is a disease of cool season turf particularly bentgrass. Turf Damage: Initial patches often resemble fusarium patch; however, they continue to develop after fusarium has ceased in late spring. Turf Damage: Patches can range from 10cm to an are No Ophiobolus patch \disease, caused by the fungus Ophiobolus graminis var. avenae, has been observed in any of the S treated plots, but does occur in some plots without S. Increased resistance to low temperature injury was noted during one winter. The winters in wester

Turf: Take-All Patch of Bentgrasses UMass Center for

Goss R L and Gould C I 1967 Some interrelationships between fertility levels and Ophiobolus patch disease in turf-grass. Agron. J. 69, 149-151. Google Scholar 7. Graham R D and Rovira A D 1984 A role of manganese in the resistance of wheat plants to take-all. Plant and Soil 78, 441-444. Google Scholar Ophiobolus patch Ophiobolus graminis Decrease Leaf spot Helminthisporium spp. Decrease Wheat Glume blotch Septoria nodorum Decrease Take-all Gaeumannomyces graminis Decrease Stem rust Puccinia graminis Decrease Stripe rust Puccinia striiformis Decrease Powdery mildew Erysiphe graminis Decreas

Take-all patch (previously called ophiobolus patch) causes circular, brown or straw coloured patches of grass - often extensive in size, up to 1m (3ft). These mainly occur in summer when the grasses are suffering drought stress. It usually attacks fine-leaved grasses. It is one of the most damaging lawn diseases, but it is not that common Diseases Dollar spot, Ophiobolus patch, Pythium, Redthread REFERENCE HANDRECK K A, and BLACK N D, 1994. Growing media for ornamental plants and turf. University of New South Wales Press HANDRECK KA, 1993. Gardening down under. CSIRO. p125 HANKS, Margaret, 1996. A Growers guide to hedges, lawns and groundcovers. Murdoch Books, North Sydne Sulphur has signifi­cantly reduced Fusarium patch disease as well as Ophiobolus patch. I am sure I have seen Ophiobolus here in New Zealand but it hasn't been positively identified yet. It is called foot rot in cereals. One strain, the oat variety, however, infects bentgrasses. Sulphur is the only cure we have found Formerly known as ophiobolus patch, take-all patch is a disease of cool season turf, particularly bentgrass. Initial patches often resemble fusarium patch, however, they continue to develop after fusarium has ceased in late spring. Patches can range from 10 cm to over 3 m

Example: Take-all patch is valid; Ophiobolus patch is invalid. In all of these situations, the Turfgrass Thesaurus will tell you which term to use (as long as we've accounted for it already.) Please note that the Turfgrass Thesaurus is a continuously evolving and developing outline/structure of turf terminology The pathogenicity of fungi associated with foot- and root-rot diseases of irrigated wheat in Nigeria. PANS. 24 (3), 306-312. Goos R J, Johnson B E, Stack R W, 1994. Penicillium bilaji and phosphorus fertilization effects on the growth, development, yield and common root rot severity of spring wheat

Control of Ophiobolus patch in Agrostis turf using

all (Ophiobolus) patch, rust, and other leaf diseases and weeds. Proper turf fertilization can be achieved with a fertilizer that contains nitrogen, phosphorus, and potassium in a 3-1- 2 ratio. Some examples are 124-8 or 9-3-5 fertilizer. The numbers indicate the percentage of available nitrogen, phosphorus, and potassium shriveled heads, and in turf, Ophiobolus patch, is a root and foot rot disease of cereals and grasses (Nilsson, 1969) caused by Gaeumannomyces graminis (Huber and McCay-Buis, 1993). Specifically, take-all of wheat (Triticum aestivum L.) is caused by G. graminis (Sacc.) Arx and Oliver var. tritici Walker (= Ophiobolus graminis Sacc. Factors affecting Occurrence of the Ophiobolus Patch Disease of Turf and its Control by Phialophora radicicola. J. W. Deacon, Pages: 149-155; First Published: 01 December 1973; Abstract; PDF; References; Request permissions; no Nematode-transmitted Viruses of Sugar Beet in England, 1965-1972

(Take-all Patch Disease, Ophiobolus Patch (Causative Agent)

Take-all patch (Gaeumannomyces graminis) This disease has been called Ophiobolus patch or Gaeumannomyces patch. Only bentgrasses are susceptible, so it is seen most commonly on golf course greens and fairways, where it can cause serious turf losses. [Read more] Yellow patch (Rhizoctonia cerealis Items of research mentioned include: the control of apple scab and mildew, and the compatibility of fungicides; control of Ophiobolus patch on bent-grass with PMAS; control of bacterial blight of lilacs with Agrimycin; soil fumigation to control verticillium wilt on cantaloupes and aubergines; effect of frost damage on botrytis infection of blueberries; incidence of mosaic and rubbery wood.. Ophiobolus patch was reported to be more severe on seedling turf grown at high nitrogen levels, but on mature, established turf the reverse was true (14). Cheesman (7) reported that increasing nitrogen increased both the number of Helmintho-sporium lesions and their size on bluegrass foliage EP0192342A2 EP86300461A EP86300461A EP0192342A2 EP 0192342 A2 EP0192342 A2 EP 0192342A2 EP 86300461 A EP86300461 A EP 86300461A EP 86300461 A EP86300461 A EP 86300461A EP 0192342 A2 EP0192342 A2 EP 0192342A2 Authority EP European Patent Office Prior art keywords seeds carrier seed agriculturally useful bran Prior art date 1985-02-14 Legal status (The legal status is an assumption and is not a.

Some Interrelationships between Fertility Levels and

7 Mejores Fungicida Compo Cesped Roy 2020

Turfgrass Diseases: The Relationship of Potassiu

Take-all usually occurs in irregular patches within a field. This disease really does take-it-all in these patches, hence the name take-all. The distinct blackening of the root system and crown tissue is the most characteristic symptom of take-all Symptoms Young plants wither, turn brown, and die, leaving irregular bare patches 1 inch or more in diameter. Cultural control. Seeding in the spring (prior to Memorial Day) and in the fall (after Labor Day) will promote turfgrass establishment and greatly reduce the development of damping-off by avoiding extreme temperatures (hot or cold) Instalación y mantenimiento de zonas verdes 7.14.14. PERROS Y GATOS. 73 . 7.14.15. TABLA DE LOS PRINCIPALES PLAGUICIDAS Y PAGAS SOBRE LAS QUE ACTÚAN

Take All Patch - Nutur

(1984). Suppression of Wheat Take-all and Ophiobolus Patch by Fluorescent Pseudomonads from a Fusariumsuppressive Soil. (1966). The Aerobic Pseudomonads: A Taxonomic Study. (1978). The Fluorescent Pigment of Pseudomonas fluorescens : Biosynthesis, Purification, and Physiochemical Properties. (1975) This study evaluated the use of grass clippings discharged from golf courses as the raw material for production of a suppressive compost to control Rhizoctonia large-patch disease in mascarene grass. Bacillus subtilis N4, a mesophilic bacterium with suppressive effects on the pathogenic fungusRhizoctonia solani AG2-2, was used as an inoculum in a procedure developed with the aim of controlling. Archived Publications. Applied Turfgrass Science (2004-2014) Crop Management (2002-2014) Forage & Grazinglands (2003-2014) Journal of Production Agriculture (1988-1999 Dead spot severity, pseudothecia development, and overwintering of Ophiosphaerella agrostis in creeping bentgrass

I.Analyze Your Lawn . A. Visual Analysis Periodically inspect your lawn: Look at the density and color of the grass, presence of weeds including weed grasses, signs of soil compaction, turf disease or damage from crane fly larvae.This will help you determine what maintenance actions are called for. The decision is yours about maintenance for appearance because it is strictly subjective Suspected money launderer. Inbred people have one. Copula based cluster analysis. He will do. Showing that the slide button onto fabric. (570) 616-1777 Solve for u. Feel suspicious of collusion Ophiobolus Take-all-Patch. Sie sind hier: Startseite » Rasenkrankheiten » Ophiobolus Take-all-Patch (Gaeumanomyces graminis) Ophiobolus ist eine weltweit verbreitete bodenbürtige Krankheit. Probleme bereitet sie vor allem auf neu angelegten Greens während der ersten 3 - 4 Jahre eng: Crown sheath rot of rice; Ophiobolus patch; Patch disease of turf; Take-all of cereals; Whiteheads of grasses fre: PiÚtin des cÚrÚales; PiÚtin-Úchaudage des cÚrÚales; PiÚtin-Úchaudage des graminÚes ger: Schwarzbeinigkeit: Getreide; Schwarzbeinigkeit: Gramineen; Weissaehrigkeit: Gramineen slv: črna žitna noga spa: Mal de pie de.

He followed this up with a further two years post doc research from 1971- 1973 on Ophiobolus Patch Disease of turf (caused by Gaeumannomyces graminis) and its control by Phialophora graminicola in the same lab at Cambridge. He joined Edinburgh University as a lecturer in the Microbiology dept in September 1973 and progressed to Senior Lecturer NSW 2153 ICL Specialty Fertilizers PO BOX 6170 Baulkham Hills Tel: +61 2 8801 3300 Figure 2. Effect of turf nutrition on the incidence of take-all patch (Ophiobolus graminis).In a separate study, susceptibility to fusarium patch was directly related to the nutrient status of th patches in a preceding crop and also through sur­ rounding areas of the good plant growth oncalcare­ ous sandy soils enabled Simon and Rovira (1985) to demonstrate yield response of 322% and 29% inside and outside the patches, respectively. When this information was combined with aerial photo­ graphs which showed that the patches made u

Deacon, J. W.: Factors affecting Occurence of the Ophiobolus Patch Disease of Turf and its Control by Phialophora radicicola, 1973 Deacon, J. W.: Phialophora radicicola and Gaeumannomycetes graminis on roots of grasses and cereals, 197 Microdochium Patch ( Fusarium Patch ) Moss Necrotic Ring Spot Pink Snow Mold Powdery Mildew Pythium Blight Pythium Root Rot Red Leaf Spot Red Thread & Pink Patch Rusts Slime Molds Snow Scald Stripe Smut Summer Patch Take-All ( Ophiobolus Patch ) Yellow Patch ( Cool Season Brown Patch Ophiobolus cannabinus is a plant pathogen that causes stem canker on hemp . [1] to leave orange-brown patches. The leaves are broad, lanceolate, 4-11 cm long and 1-3 cm wide, with a serrated margin; they are dull dark green above and green to glaucous-green below, with a 1-2-cm petiole with two conspicuous basal stipules .. Damping off typically occurs when old seed is planted in cold, wet soil and is further increased by poor soil drainage. High humidity levels, rich potting soils and planting too deeply will also encourage its growth. Fungal spores live in the soil and are primarily a problem in seed beds. They can be transported on garden tools and in garden.

Take-all Patch - Living Tur

The fungi consistently associated with stunted patches and deadheads in wheat during 1959-66, in order of frequency, were Fusarium culmorum, Curvularia ramosa, Hel-minthosporium sativum [Cochliobolus sativus]. Pythium ultimum, Rhizoctonia solani, Ophiobolus [Gaeumannomyces] graminis and F. graminearum [Gibberella zeae]. In the higher rainfall areas barley yellow dwarf virus was found each. Suppression of wheat take-all and Ophiobolus patch. by fluorescent pseudomonads from a Fusarium-supressive soil. Soil , Biol. Bichem. 16:397-403. Zhou, T. & Paulitz, T. C. 1993. In vitro and in vivo effects: of Pseudomonas spp. On. Pythium aphanidermatum: Zoospore behavior in exudates and on the rhizoplane of. bacteria-treated cucumber roots. Rhizomatous grass weeds and Ophiobolus graminis Sacc Rhizomatous grass weeds and Ophiobolus graminis Sacc Ph.D., Alan G. Walker, 1945-05-01 00:00:00 Many investigatorshave noted the presence of O p h bolus graminis on grass weeds under field conditions and pointed out the importance of such weeds in perpetuating the disease either from original foci of infection in virgin grassland or from. Gaeumannomyces graminis is pathogenic on many members of the Poaceae family, but is most commonly a problem on wheat, barley, rye, oats and turf grass. G. graminis var. tritici is the form of the fungus that attacks wheat and related species, whereas G. graminis var. avenae attacks oats and G. graminis var. graminis is problematic on turf and. Ophiobolus or Take all disease (Gaeumannomyces graminis) This disease affects Agrostis Spp. being most active in late summer and autumn and favoured by wetness and alkalinity, especially after liming. Rings of yellow or orange grass appear as a result of fungal attack on the roots. The centres of the diseased patches tend to become colonised by.

News & Events Genesis Turfgras

Slime mould is a disease affecting all turfgrass varieties. Causal Agent: Mucilago spp., Didymium spp. & Physarum spp. Susceptible Turfgrasses: All turfgrass species. Symptoms. Fruiting bodies may smother grass blades turning them grey, pink, purple, white or yellow This study evaluated the use of grass clippings discharged from golf courses as the raw material for production of a suppressive compost to control Rhizoctonia large-patch disease in mascarene grass. Bacillus subtilis N4, a mesophilic bacterium with suppressive effects on the pathogenic fungus Rhizoctonia solani AG2-2, was used as an inoculum in a procedure developed with the aim of. ? Misleading Information You Decide 2,4-D PMRA Federal Government Health Canada Ontario Pesticide Ba Qualgex Pro Surface Biocide 5L. SKU:0488701-05 Qualgex Pro is a surface biocide for professional use and is fully HSE registered. Qualgex Pro can be used to treat algae and lichen on external hard surfaces including artificial sports surfaces, patios, tarmac, headstones and concrete paths

2. Rhizoctonia Bare Patch or Sharp Eyespot is caused by the cosmo-politan soil-borne fungus Rhizoctonia solani. Unlike Foot Rot or Eye-spot (1 ), both roots and stems of winter and spring wheats are infected with a brownish decay. Bare or thin patches of stunted seedlings and older plants, having a purplish cast to the lower stems and leaves, ar - contro il mal del piede(Pseudocercosporella herpotrichoides, Ophiobolus graminis) in fase di accestimento - levata - contro oidio (Erysiphe graminis), Ruggini (Puccinia spp.), Rincosporiosi (Rhynchosporiums pp.), Elmintosporiosi, Septoria, (Septoria spp.) dalla fase di inizio levata alla spigatura-contro fusariosi della spiga (Fusarium. Interactions where Triticum is the victim or passive partner (and generally loses out from the process) . The following relationships have been collated from the published literature (see 'References'). Filters: Show All Hide Herbivores Hide Parasites Hide Mycorrhizae Hide Saprobes. Hide Fungi Hide Ascomycete Fungi Hide Basidiomycete Fungi Hide Fungoids. Hide Animals Hide Thysanoptera Hide. The Agrostis, because of its dense root system, may, if neglected, suffer from Ophiobolus (take all patch) which destroys the roots. Understand the importance of suitable soil. Soil is composed of sand, silt and clay. The sand is inert, the silt is unstable and the clay is a colloid but together, in the right proportions, they form the ideal. Siderophores produced by Pseudomonas spp. and other rhizobacteria like Alkaligens, Bacillus, Enterobacter etc. have been implicated in the biological control of several diseases, including damping-off of cotton caused by Pythium ultimum (Loper 1998; Laha et al.1992), root rot of wheat caused by Pythium sp. (Becker and Cook 1988), ophiobolus. to irregular patches within fields (Figure 1). These patches commonly later increase in size. Affected plants become brittle and are easily pulled up. The roots are often brown or black, with water-soaked areas. Later, the roots die and slough-off. Infected crown tissue is bleached, brown or black, and rotted