Clint M. Mattox
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View article: Comparing activated charcoal and biochar for carbon‐seeding in grass seed production
Comparing activated charcoal and biochar for carbon‐seeding in grass seed production Open
Perennial ryegrass ( Lolium perenne L. ssp. perenne ) seed production fields in western Oregon are often established using carbon‐seeding, which consists of applying a band of activated charcoal (AC) over the seed row at the time of sowing…
View article: <i>Poa annua</i> ecology, biology, and integrated weed management practices in turfgrass
<i>Poa annua</i> ecology, biology, and integrated weed management practices in turfgrass Open
Poa annua L. is one of the most widespread and troublesome weeds of turfgrass. It persists as both an annual and perennial and is adaptable to almost any static maintenance regime, including adaptation to mowing heights and evolution of he…
View article: Multi‐state survey to identify suspected resistance to four herbicides and one plant growth regulator in <i>Poa annua</i>
Multi‐state survey to identify suspected resistance to four herbicides and one plant growth regulator in <i>Poa annua</i> Open
Plain Language Summary Poa annua is a troublesome weed in turfgrass areas such as golf courses, athletic fields, lawns, and sod farms. Controlling P. annua is made more difficult by the growing problem of herbicide resistance, the inherite…
View article: Mowing Height and Fertility Regime Effects on Tall Fescue Turf in the Pacific Northwest
Mowing Height and Fertility Regime Effects on Tall Fescue Turf in the Pacific Northwest Open
The western portion of the Pacific Northwest is known for being dry in the summer and cool and humid in the other months. Tall fescue is valued for its drought and heat tolerance, making it a desirable choice in regions where water is scar…
View article: A survey of ethofumesate resistant annual bluegrass (<i>Poa annua</i>) on US golf courses
A survey of ethofumesate resistant annual bluegrass (<i>Poa annua</i>) on US golf courses Open
Annual bluegrass ( Poa annua L.) is the most troublesome weed on golf courses in the US. Many agronomic practices intended to promote high‐quality playing surfaces favor the growth and development of annual bluegrass, resulting in high wee…
View article: Ethofumesate-resistant annual bluegrass (<i>Poa annua</i>) in grass seed production systems
Ethofumesate-resistant annual bluegrass (<i>Poa annua</i>) in grass seed production systems Open
The prolific seed production and polyploidy of annual bluegrass allow for the rapid development of herbicide resistance. Ethofumesate-resistant annual bluegrass plants were identified in the 1990s in grass seed production in Oregon, but th…
View article: Using survey results to direct future extension efforts in annual bluegrass management
Using survey results to direct future extension efforts in annual bluegrass management Open
Controlling unwanted annual bluegrass ( Poa annua L.) in desirable turfgrass species often relies heavily on herbicide use. As a result, increasing populations of herbicide‐resistant annual bluegrass have become a concern. In 2018, a unive…
View article: Agricultural Research Service Weed Science Research: Past, Present, and Future
Agricultural Research Service Weed Science Research: Past, Present, and Future Open
The U.S. Department of Agriculture–Agricultural Research Service (USDA-ARS) has been a leader in weed science research covering topics ranging from the development and use of integrated weed management (IWM) tactics to basic mechanistic st…
View article: Developing and implementing a sustainable, integrated weed management program for herbicide‐resistant <i>Poa annua</i> in turfgrass
Developing and implementing a sustainable, integrated weed management program for herbicide‐resistant <i>Poa annua</i> in turfgrass Open
The ability of Poa annua L. to adapt to most turfgrass environments extends to its ability to develop resistance to commonly used herbicides. Herbicide resistant P. annua is of almost epidemic proportions. The loss of once viable chemical‐…
View article: Comparing methods to quantify cover in turfgrass research
Comparing methods to quantify cover in turfgrass research Open
Turfgrass cover can be assessed qualitatively using visual ratings, but quantitative turfgrass cover measurements are desired for producing unbiased data. Digital image analysis and point intercept are two quantitative percent cover data c…
View article: High soil carbon sequestration rates persist several decades in turfgrass systems: A meta-analysis
High soil carbon sequestration rates persist several decades in turfgrass systems: A meta-analysis Open
View article: Carbon Sequestration in Turfgrass–Soil Systems
Carbon Sequestration in Turfgrass–Soil Systems Open
Plants are key components of the terrestrial ecosystem carbon cycle. Atmospheric CO2 is assimilated through photosynthesis and stored in plant biomass and in the soil. The use of turfgrass is expanding due to the increasing human populatio…
View article: High Soil Carbon Sequestration Rates Persist Several Decades in Turfgrass Systems: A Meta-Analysis
High Soil Carbon Sequestration Rates Persist Several Decades in Turfgrass Systems: A Meta-Analysis Open
View article: The effects of iron sulfate heptahydrate water carrier volumes on Microdochium patch suppression and turfgrass quality
The effects of iron sulfate heptahydrate water carrier volumes on Microdochium patch suppression and turfgrass quality Open
Microdochium patch is a turfgrass disease caused by the fungal pathogen Microdochium nivale (Fries) Samuels & I.C. Hallett that occurs most commonly in cool‐humid regions such as the Pacific Northwest. Fungicide applications are the predom…
View article: Frequent soil surfactant applications influence anthracnose on an annual bluegrass research green
Frequent soil surfactant applications influence anthracnose on an annual bluegrass research green Open
Anthracnose is a turfgrass disease caused by the fungal pathogen Colletotrichum cereale Manns and can cause severe damage to annual bluegrass putting greens. Most turfgrass managers use fungicides to manage anthracnose, although legislatio…
View article: Combinations of rolling, mineral oil, sulfur, and phosphorous acid affect Microdochium patch severity
Combinations of rolling, mineral oil, sulfur, and phosphorous acid affect Microdochium patch severity Open
Microdochium patch is a turfgrass disease that occurs in cool, humid regions caused by the fungal pathogen Microdochium nivale (Fr.) Samuels & Hallett [Teleomorph = Monographella nivalis (Schaffnit) E. Müll]. Fungicide applications are the…
View article: Water requirements influenced by turfgrass species and mowing height in western Oregon
Water requirements influenced by turfgrass species and mowing height in western Oregon Open
Drought triggers a range of abiotic stresses resulting in loss of green color and summer dormancy in cool-season turfgrasses (Lewis, Bremer, Keeley, & Fry, 2012). Mitigating drought stress may require supplemental irrigation, but data on w…
View article: Optimizing Irrigation Rates and Frequency for Perennial Ryegrass in Western Oregon
Optimizing Irrigation Rates and Frequency for Perennial Ryegrass in Western Oregon Open
Core Ideas Irrigation applied at a rate of 3.0 inches per month (0.75 inches per week) from July to September will provide improved perennial ryegrass turf quality and percent green cover in western Oregon. Replacing 45 to 49% evapotranspi…
View article: The Influence of Iron Sulfate Application Interval on the Suppression of Microdochium Patch on an Annual Bluegrass Research Green in Western Oregon
The Influence of Iron Sulfate Application Interval on the Suppression of Microdochium Patch on an Annual Bluegrass Research Green in Western Oregon Open
Core Ideas Two pounds of Iron sulfate heptahydrate per thousand square feet applied every two weeks suppresses Microdochium patch more consistently than a four week application interval and more effectively than a six or eight week interva…
View article: Effects of Sulfur and Calcium Source on pH, Anthracnose Severity, and Microdochium Patch Management on Annual Bluegrass in Western Oregon
Effects of Sulfur and Calcium Source on pH, Anthracnose Severity, and Microdochium Patch Management on Annual Bluegrass in Western Oregon Open
Core Ideas Increasing sulfur application rates reduced the number of fungicide applications required to manage Microdochium patch. Increasing sulfur application rates increased anthracnose severity. Calcium carbonate, calcium sulfate, and …
View article: Effects of Winter Foot Traffic on Annual Bluegrass Putting‐Green Quality in Western Oregon
Effects of Winter Foot Traffic on Annual Bluegrass Putting‐Green Quality in Western Oregon Open
Core Ideas The objective was to document effects of winter foot traffic on an annual bluegrass putting green. Foot traffic applied at 440 rounds per day produced the greatest reduction in turf quality and color. Traffic should be limited t…
View article: Effects of Spray Nozzle and Fungicide Mode of Action on Control of Microdochium Patch on an Annual Bluegrass Putting Green in Western Oregon
Effects of Spray Nozzle and Fungicide Mode of Action on Control of Microdochium Patch on an Annual Bluegrass Putting Green in Western Oregon Open
Core Ideas Nozzle‐type spray volume and topical activity on Microdochium patch were evaluated. At equal spray volumes, TeeJet XR nozzles cover more spray area than 1/4TTJ nozzles. Smaller droplets and higher coverage maximize Microdochium …
View article: Developing and Delivering a Needs-Based Integrated Pest Management Program for Public School Grounds Employees
Developing and Delivering a Needs-Based Integrated Pest Management Program for Public School Grounds Employees Open
Core Ideas We developed an engaging and needs-based IPM training curriculum for public school IPM and Coordinators and grounds employees in the Portland Metropolitan area. Although other training options are available, none specific to the…