G92-1119 Rust Diseases of Turfgrass

This NebGuide describes the various rust diseases common to Nebraska and offers suggestions for maintaining a vigorous and disease-resistant lawn. Rust diseases occur on all turfgrasses; however, most rust problems occur on Kentucky bluegrass, perennial ryegrass, tall fescue and zoysia. In the cool-temperate regions of North America, cool season turfgrasses may suffer severe injury late in summer by attack from one of the rust pathogens. In addition, rust-weakened plants are much more susceptible to injury from environmental stresses and to attack by other turfgrass pathogens

G89-925 \u27Helminthosporium\u27 Leaf Spot and Melting Out Diseases of Turfgrass (Revised December 1995)

Symptoms and controls for Helminthosporium leaf spot and melting out are discussed. Leaf spot and melting out are two fungal diseases of turfgrass within the Helminthosporium leaf, crown and root disease complex. They are the most common and serious groups of cool season turfgrass diseases in North America

G89-925 \u27Helminthosporium\u27 Leaf Spot and Melting Out Diseases of Turfgrass (Revised December 1995)

Symptoms and controls for Helminthosporium leaf spot and melting out are discussed. Leaf spot and melting out are two fungal diseases of turfgrass within the Helminthosporium leaf, crown and root disease complex. They are the most common and serious groups of cool season turfgrass diseases in North America

G97-1341 Landscapes for Shade (Revised April 2003)

The cooling effect of a shade garden in midsummer can be one of life\u27s great pleasures. The combination of shade and dappled sunlight encourages people to stop and enjoy a cool, quiet respite from a busy day. This NebGuide includes information on gardening in the shade

G81-558 Tall Fescue Lawn Calendar (Revised April 2004)

This NebGuide on tall fescue lawns discusses the calendar dates of when to mow, fertilize, water, apply herbicides and pesticides, check for insects and diseases, remove thatch, and when to aerify and overseed

Nitrogen Phosphorus, and Potassium Effects on Seeded Buffalograss Establishment

Field studies were conducted in Kansas, Nebraska, and Oklahoma in 1996 tp evaluate the influence of nitrogen (N), phosphorus (P), and potassium (K) applied alone or in combination on the establishment rate of buffalograss [Buchloe dactyloides (Nutt.) Engelm.] from seed. \u27Cody\u27 buffalograss burrs were planted at 98 kg∙ha-1 at planting and at 49 kg∙ha-1 weekly or every other week for 5 weeks after seeding (WAS). The total N amounts applied were 0, 49, 147, 294 kg∙ha-1. Phosphorus and K were applied at rates of 0 or 49 kg∙ha-1 at planting only. Percent buffalograss coverage ratings were taken weekly for up to 11 WAS. Buffalograss coverage was enhanced by N rates up to 147 kg∙ha-1. Application of P improved buffalograss establishment at the Nebraska and Oklahoma sites but had no effect on the Kansas site. Potassium application had no influence on establishment at any site. Chemical names used: methyl 2- [[[[(4-methoxy-6-methyl-1,3,5- triazin- 2- yl)- amino] carbonyl] amino] sulfonyl] benzoate (metsulfuron methyl); 6-chloro-N,N\u27-diethyl-1,3,5-triazine-2,4-diamine(simazine

James B Beard: The Father of Contemporary Turfgrass Science

James B Beard (24 Sept 1935 to 8 May 2018) can rightly be considered the “Father” of contemporary turfgrass science. During his career, he was known for setting a standard that provided the foundation for turfgrass science through his thorough approach to research, teaching, mentoring and communications. The books he published outlined a vision for an evolving scientific discipline. He trained and mentored \u3e45 domestic and international doctoral and master students and numerous post-doctoral trainees, who in turn continued to raise the quality of contemporary turfgrass science in the USA and internationally. He led the effort to change the name of Division C- 5 of the Crop Science Society of America (CSSA) from Turfgrass to Turfgrass Science, making C-5 an important and a vital part of the society. His subsequent rigorous education and mentoring of others continued to strengthen the division. He recognized the importance of quality, peer-reviewed science and the need for C-5 to be represented on the Crop Science Journal (CSJ) Editorial Board to expedite this goal. His leadership and encouragement led to the creation of a C-5 Technical Editor position on the CSJ Editorial Board in 2002. Beard provided the vision and worked with other leaders worldwide to develop the International Turfgrass Society (ITS) and the ITS Research Journal. The ITS and its leaders and members have been instrumental in enhancing turfgrass science internationally. Beard’s leadership, along with others in turfgrass academia and industry, resulted in the USGA Turfgrass and Environmental Research Program that provides a competitive grant-fund source for turfgrass research. Beard appreciated and vigorously studied history and contributions to turfgrass science by those who went before us. He leaves behind a legacy in science that deserves recognition and respect. It is our hope that this synopsis of Beard’s career accomplishments will inspire present and future turfgrass scientists to follow in his footsteps

Changing the Support of a Spatial Covariate: A Simulation Study

Researchers are increasingly able to capture spatially referenced data on both a response and a covariate more frequently and in more detail. A combination of geostatisical models and analysis of covariance methods may be used to analyze such data. However, very basic questions regarding the effects of using a covariate whose support differs from that of the response variable must be addressed to utilize these methods most efficiently. In this experiment, a simulation study was conducted to assess the following: (i) the gain in efficiency when geostatistical models are used, (ii) the gain in efficiency when analysis of covariance methods are used, and (iii) the effects of including a covariate whose support differs from that of the response variable in the analysis. This study suggests that analyses which both account for spatial structure and exploit information from a covariate are most powerful. Also, the results indicate that the support of the covariate should be as close as possible to the support of the response variable to obtain the most accurate experimental results

Comparison of an ultra-low volume (ULV) sprayer against a conventional sprayer, for foliar fertiliser and fungicide applications in turfgrass

Two field studies (I and II) at the University of Nebraska-Lincoln: John Seaton Anderson Turfgrass Research Facility near Mead, NE, USA, were conducted to determine if a new ultra-low volume (ULV) sprayer can apply foliar nutrient, growth regulator, and fungicide treatments, in a manner similar to that of a conventional sprayer. Treatments were applied over creeping bentgrass ‘L-93’ (Agrostis stolonifera L.) managed as a fairway at 561 l · ha−1 and 47 l · ha−1 with the conventional and ULV sprayer, respectfully. Data were collected for chlorophyll content with a chlorophyll meter, and for the normalised difference vegetation index (NDVI) with a turf colour meter. Each plot was harvested for biomass at 21 days after treatment. Study II compared the ULV sprayer and a conventional sprayer, for the control of brown patch (Rhizoctonia solani Kuhn) in creeping bentgrass. The treatments were propiconazole and azoxystrobin. Spray volume was 561 l · ha−1 for the conventional sprayer, and 19 l · ha−1 for the ULV sprayer. Statistical differences in turf quality or dry weight reductions between the conventional and ULV sprayer were not detected. Brown patch control was also similar between the two sprayers, but azoxystrobin provided better control than propiconazole. Even with a 30-fold decrease in application volume, the results indicated that the Kamterter ULV sprayer may be a useful and effective management option for foliar fertiliser and fungicide applications in turfgrass

EC02-173 Spotted and Diffuse Knapweed

Spotted knapweed (Centaure amaculosa Lam. = C. biebersteinii DC.) and diffuse knapweed (C.diffusa Lam.) are two of Nebraska’s seven noxious weeds. They are also noxious in at least 17 other states. These are closely related species that are well adapted to a variety of habitats including open forests, rangelands and pastures, Conservation Reserve Program lands, roadsides, and ditch banks. Centaurea is a large genus of over 400 species, 32 of which are common weeds of the United States and several of which [e.g., yellowstar thistle, C. solstitalis L, and Russian knapweed, C. repens L. =Acroptilon repens (L.) DC.] have been identified officially as noxious weeds in nearby western states. Other Centaurea species areused as ornamentals. The knapweeds were introduced to the United States from the grasslands of southeastern Europe and Asia. Spotted knapweed now infests more than seven million acres and diffuse knapweed more than three million acres of rangeland and pastures in the western United States