Full TGIF Record # 229354
Item 1 of 1
Publication Type:
i
Report
Author(s):Colbaugh, Phillip F.
Author Affiliation:Texas Agricultural Experiment Station, Dallas
Title:Discussion VII: Disease control
Meeting Info.:Blacksburg, Virginia: June 22-24, 1987
Source:1987 Southern Turf Research Information Exchange Group:Meeting Record. 1987, p. 25-27.
# of Pages:3
Publishing Information:s.l.: Southern Research Information Exchange Group
Abstract/Contents:"Patterns of heavy spring rainfall in many areas of the South have measurably increased the incidence and severity of turfgrass diseases. In addition to familiar disease problems on widely used turfs, there is an increasing recognition of diseases on newer introductions as their acreage and use increase. Pythium and Rhizoctonia blight on bentgrass golf greens have become more of a problem with the effort to push current bentgrass varieties further South than ever before. One Golf Course in Houston, Texas recently converted to bentgrass greens. Floridians may some day see bentgrass on golf courses which have previously relied on durable hybrid bermudagrass for greens. The introduction of zoysiagrass and tall fescue grass into the Southern growing areas has also met with similar disease difficulties. Problems with Rhizoctonia blight and the potential of sever rust diseases on both grasses as well as particular problems with dollar spot and Helminthosporium Leaf Spot respectively will focus attention on turfgrass management strategies designed to reduce environmental stress and the potential for damaging disease outbreaks. Turfgrass breeding efforts are seeking turfgrass varieties with tolerance to stressful environments, however, the identification of germplasm lines with tolerance to a number of disease and insect pests is also needed. Cooperative research efforts are now attempting to develop turfgrasses with resistance to a multitude of disease, insect and cultural problems (1, 2). Perhaps the least understood of all turfgrass diseases are those caused by soil-borne fungal pathogens. Turfgrass pathologists in the northern states have identified Leptosphaeria korrae (Walker and Smith) and Phialophora graminicola (Decon) Walker as the causal agents of necrotic ring spot and the summer patch disease of Kentucky bluegrass, respectively. The fungus L. korrae, has also been associated with the Spring Dead Spot disease in Southern California (3) and is presumed to be a primary pathogen. Additional investigations in Florida (4) have implicated Phialophora radicola as the cause of Bermudagrass Decline. Causal agents for similar decline diseases of centipedegrass, zoysiagrass, and buffalograss (5) remain to be resolved. The causal nature of organisms associated with these diseases appears to be very difficult to ascertain. Field evaluations of disease reaction on Kentucky bluegrass (necrotic ringspot, summer patch) and bermudagrass (spring dead spot) have demonstrated cultivar differences in disease tolerance. Hopefully, these disease tolerant lines can be used in future genetic improvement programs."
Language:English
References:5
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Colbaugh, P. F. 1987. Discussion VII: Disease control. 1987 Southern Turf Research Information Exchange Group:Meeting Record. p. 25-27.
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