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Featured Articles
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Leaf Spot Diseases Caused by Drechslera
Diseases caused by Drechslera spp. were formerly classified as Helminthosporium leaf, crown, and root diseases. The fungus attacks cool season turfgrasses during the cool wet weather of spring and fall.
Drechslera leaf spot/melting-out symptoms initially appear as leaf spot lesions. The lesions initially appear as small purple colored dots. These lesions turn a gray to tan color with a dark purple to brown border. In the leaf spotting stage these diseases do not normally cause significant injury to the plant. However, as temperatures increase, infection may occur in the crown, stems, and roots where the plants eventually turn a straw colored and die. This is known as the melting-out phase of the disease.
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Some Interesting Facts about Poa annua
Depending on the climatic region Poa annua is a plant that you either try to manage as a desirable turf, or it is a weed to be removed. Its evasive characteristics are due in a large part from the evolution of different survival strategies (Cline et al., 1993). One strategy is its broad genetic base resulting in wide range of genotypes within a small area like a golf green. Poa annua has also maintained its ability to flower and produce seed under low mowing heights. Read More
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Brown Ring Patch / Waitea Patch
The appearance of yellow to reddish brown rings is a common springtime occurrence on golf course turf. Yellow Patch, the disease often associated with these rings can occur on creeping bentgrass (Agrostis stolonifera) and perennial ryegrass (Lolium perenne), but the symptoms are most widespread on Poa annua. The patches can range from circular to irregular or scallop shaped ranging from 50 cm to 1 meter in diameter. The yellow ring along the circumference of the patch ranges from 1 to 3 cm in width. Read More
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Welcome to The GlobalTurf Network
The GlobalTurf Network (GTN) is the most comprehensive site for turfgrass information globally. GTN is comprised of 6 individual international website that provides technical information to the languages of Chinese, Czech, Polish, Portuguese, Russian, and Spanish. The information is current and presented in written and video formats. Topics include turfgrasses, cultural practices, pests, and many more directed to the language region of each website. For more information visit the website that is most applicable to you.
Karl Danneberger
globalturf
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Column - Golfdom
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When are Golf Greens Stable?
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With summer stress periods on the horizon, golf course superintendents often wonder why turfgrass species that are so carefully maintained are so easy to lose. From a management perspective, what makes for a stable putting green? Ecologically, one misnomer is that complexity leads to stability, suggesting single-or two-grass species greens are unstable. -
Basal Anthracnose: Springtime Ritual
Read MoreSpring is an annual ritual for cool-season turf rejuvenation. Maximum root elongation and production occurs in the early spring with the foliar growth following shortly behind. Middle to late spring should be the time creeping bentgrass and/or Poa annua greens are on full "go" reflected in the ubiquitous green color of the season. In the last 15 years "go" has been replaced with a "caution or stop," characteristic of the yellowish-orange symptoms of anthracnose. -
Attack Poa on All Fronts. Then What?
Read MoreAs much as an issue divides Republicans and Democrats, Poa annua divides those who try to manage it and those who try to kill it. For those trying to control it, straddling the issue may be the key.
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