dethatching bentgrass

Thatch management is a key to combating bentgrass diseases and keeping these pests at bay says Katerina Serlemitsos-Jordan, an associate professor at the University of Guelph, in the school's plant agriculture department. Bentgrass and vigorous varieties of improved Kentucky bluegrass develop thatch more quickly than older varieties of common Kentucky bluegrass. Bentgrass produces above ground stolens that gradually spread and end up looking like the end of a broom in late summer. On sand based greens, thatch can easily accumulate as much as 0.5" per year. ), and . When to Dethatch Your Lawn in New England. The NTEP initiated new bentgrass putting green and fairway trials in 2020. Bentgrass seed is very small, having 5 million seeds per pound. Heat Stress and the Decline of Bentgrass . Fall dethatching works but often results in an increase in the amount of Poa trivialis and Poa annua in the stand since they grow better in winter than bentgrass. Dethatching will be easier and you will get better germination with your new seed when the ground is better prepared for it. Treatments Used This will starve the grass of everything it needs while it's in the middle of what should be a growth cycle. You should spray about 6 inches beyond the patches to make sure you . Turfgrass species is also a factor. The new test has 15 entries, along with standards at 19 locations in the U.S. Nine trials are standard test locations at universities, while four sites will have ancillary tests for traffic tolerance, thatch accumulation and anthracnose. The dethatcher prevents this. The main difference is that the verticut will lightly loosen the soil while a dethatcher will aggressively dig into the root system to remove thatch. The excess water in the top 1/2 inch of soil can cause an oxygen deficiency and creates . 2.8 mm (low) or domestic lawn e.g. Creeping bentgrass requires frequent watering, mowing, aerating, and dethatching, and high levels of fertilizer. You can manually dethatch your lawn using a dethatching rake. Thatch is a tightly intermingled layer of partially decomposed grass stems and roots that develops beneath the actively growing green vegetation and above the soil surface. The only use of this species in the South is for golf course putting greens where environments are closely managed. This mower has a series of revolving This grass has the capability of spreading and taking other types of grass. The solution: Dethatching is the process of vigorously raking up excess thatch (the layer of dead grass, leaves, and other organic matter between grass blades and the soil surface) to give soil and grass roots access to water, oxygen, sunlight, and nutrients. It is the natural consequence of a healthy lawn, explained Cook. Fall is a great time to dethatch (if you haven't already done it in the . When to Dethatch Nitrogen was applied at the given rate on a monthly basis. For instance, creeping bentgrass and bermudagrass produce more thatch than perennial ryegrass or annual bluegrass (Poa annua). Mow 3 days later and do it shorter and shorter. Below 0.125 it is not able to maintain density and compete over the long term with annual bluegrass. Colonial bentgrass is a cool-season grass that thrives in cool coastal weather. A layer thicker than ½ inch signals it's time for dethatching. Share sensitive information only on official, secure websites. Bentgrass and vigorous varieties of improved Kentucky bluegrass develop thatch more quickly than older varieties of common Kentucky bluegrass. Enjoy! You can remove thatch using a manual dethatching rake or operating a mechanical tool, such as a verticutter, power rake, or dethatcher.. Manual dethatching with a rake is a labor-intensive and time-consuming job, so if you are a DIY-er, it's best to tackle this job if it's only for small areas with a light layer of thatch. Grass Varieties Generally, the more vigorous the grass, the greater the tendency to develop thatch. What thatch depth is considered excessive on bentgrass fairways? Thatchy turf will stay wet and soggy following rain or irrigation because it holds moisture very tightly. Grass Varieties Generally, the more vigorous the grass, the greater the tendency to develop thatch. It spreads by stolons to form a mat or thatch layer above the soil line. Kentucky bluegrass, creeping red fescue, and creeping bentgrass form thatch faster than other species. It is very prone to attack by plant diseases and Bentgrass by nature creates a thick, spongy layer of thatch. But the benefits of dethatching don't stop there. . Thatch-mat depth, surface hardness, and water infiltration rates for thatch management treatments used on an established 'A-1' creeping bentgrass golf green, 2001-2002. For best results, dethatch your lawn about every one to two years, in March or April or in the early fall. The best time to aerate warm-season grasses is early summer, however if you have a severe thatch problem in your Bermuda, Zoysia or St. Augustinegrass you can aerate anytime your lawn is actively growing. It is a moderate to high maintenance grass. In this situation light dethatching followed by coring is the best way to deal with the thatch. It does best in cool, humid weather and can tolerate some shade. The spring of 2022 has been a tough one for many turf managers… To address the summer stress on bentgrass greens I think that it is a good idea to revisit this topic. challenge: thatch control The biggest challenge with velvet bentgrass on putting greens is the accumulation of organic matter, which occurs faster than with other turfgrass species (Fig. . Bentgrass seed is very small, having 5 million seeds per pound. In her region (southern Ontario, Canada), take-all patch is the worst issue. Manual Dethatching. Dethatching can be done by ways of core-dethatching or verticutting. Aerating and dethatching are also required. Creeping bentgrass (Agrostis palustris) is a cool-season perennial grass that flowers in late spring or early summer. D. . This will kill off the bentgrass, but it will also kill the desired grasses, so only spray where the bentgrass is growing. Thatch. Old bentgrass lawns with deep thatch can be destroyed by mechanical dethatching because most of the roots are in the thatch. After several days, the bentgrass will begin to turn white, and soon after the second app, the grass will turn brown and eventually die. Cool-season grasses such as Kentucky bluegrass, creeping red fescue and creeping bentgrass all form thatch at an accelerated rate and even certain cultivars of these grasses are worse with . Spring from mid-April to mid-May is definitely the best time for dethatching bentgrass and will result in rapid recovery if followed by nitrogen fertilization. Creeping bentgrass is a low-growing grass with a shallow root system. That is not a weed commonly encountered in a home lawn in MD. It has been unusually moist here this spring (Boise, ID). (produces rhizomes) and creeping bentgrass (produces stolons), tend to produce thatch readily. Expert Response. Golfers, Club Professionals, GMs, and owners want to escape the winter doldrums and return to their predestine golf courses with firm and fast conditions. I think there's a fungal problem with the bentgrass, since it has white slimy roots, and in other places black dead roots. The most appropriate and successful method of mechanical thatch removal employs a vertical mower, also called a dethatcher or renovator. Winter desiccation stress was severe throughout Nebraska and the Dakotas during that same winter (Figure 1). The NTEP initiated new bentgrass putting green and fairway trials in 2020. Thatch. One possible way it could be introduced into a home lawn is if it was part of a seed mixture used to seed the lawn. While it doesn't remove much thatch, it does improve water infiltration and improves rooting in the soil. Wet or dry is an issue of time and if you are using baskets. There are some very clear differences between them. Moisture related issues are also common with too much thatch. Answering the Most-Asked Questions About Thatch by STANLEY J. ZONTEK Director, Mid-Atlantic Region, USGA Green Section W ITH GOLFERS' increasing expectations for closely cut fairways, tees, and greens, creeping bentgrass use in this country It requires frequent watering and is very susceptible to diseases as well as pests. Maintenance. Along with soft conditions, excessive thatch leads to poor root development, greater disease and insect pressure, reduced pesticide efficacy, and increased mower scalping. Stoloniferous grasses, where the grass spreads by overground roots, also contribute to more thatch. Bengal Creeping Bentgrass is a dense, low-thatch producing, drought tolerant plant that exhibits excellent turf quality on greens, tees, and fairways. thatch Sunday August 27 and remove with lawnrake (thatching should rip out bentgrass) - Should i do this? thatch on a creeping bentgrass green con-structed to USGA specifications. But again, bentgrass seed is not typically contained in home lawn mixtures. Spring can be a frustrating season for many in the golf industry. 3mm sounds good if you have a thatch issue. My plan is to: spray tenacity today August 19. This layer of excess organic matter holds water and therefore encourages shallow-rooted turf. Creeping bent grass was used extensively when homes were built in the early to mid 1900's before grass seed as we know it became readily available. The Best Time to Thatch a Yard. Dethatching is the process of removing thatch from the lawn. A greenhouse experiment using potted bentgrass (Agrostis stolonifera L.) determined the efficacy of a ligninolytic enzyme, laccase, in reducing organic matter accumulation in the thatch-mat layer . Thatch is an almost impenetrable mat of tangled, intertwined grass and other material on the ground surface. It may also be used on golf courses. This became known as dethatching. Fertility: Check out these dethatching lawn tips on when to dethatch your lawn, dethatching warm- and cool-season turf, and what to do after dethatching. to the development of thatch. I would start with 1-2mm if you don't have a thatch issue. Thatch also favors fungal growth and can harbor insect pests. Scalp the grass with your lawnmower, use a dethatch rake or Sunjoe to remove the excess grass (hay), and spot or overseed the bare areas. The dethatching process works best during your grass's peak growth period, which in the case of most cool-season grasses is the late summer and/or early fall. Determi-nations were also included to assess the influence of these mechanical and chemi-cal/nutrient treatments on the content of selected nutrients and the pH level of the USGA green rootzone. Basically, dethatching is a powerful, deep lawn raking. Treatments Used Thatch management is critical for long term performance of bentgrass greens. Thatch Control In a newly seeded 'L-93' creeping bentgrass putting green, percent organic matter can increase from 0.62% to 123% in just two years if appropriate cultivation techniques are not utilized. Creeping bentgrass (Agrostis palustris) is a cool-season perennial grass that flowers in late spring or early summer. It requires more fertilizer and much more water than other grasses. 007 bentgrass to be among top varieties rated for drought tolerance. Thatch develops more readily on high-maintenance A manual dethatching rake is great for light thatch removal projects, ongoing maintenance, and small lawn jobs. Bentgrass ( Agrostis) is a large genus with over 100 species, but only about four are used for turfgrass in the United States. Agrostis capillaris - Common Bent, is the type of bent found mostly on old estate lawns. Proper management practices, Light topdress after. At higher mowing heights it gets puffy and develops false crowns. It requires frequent watering and is very susceptible to diseases as well as pests. It is usually done with a gasoline-powered or electric dethatching machine, but you can also do it by hand with a dethatching rake. Understanding Pythium spp. Creeping grasses like Kentucky bluegrass and bentgrass accumulate thatch quickly and generally require at least annual dethatching while clumping grasses such as tall fescue and perennial ryegrass need dethatching no more than once every few years. A heavy, short tool with curved blades, the rake is designed to dig into your lawn and pull up thatch as you move through it. Some turfgrass species, such as tall fescue and perennial ryegrass, do not produce much thatch. It has a low tolerance for heat, salinity, water stress and traffic. Ideally thatch depth is maintained between 3/8 inch to 3/4 inch in bentgrass fairways. Annual care includes dethatching and core aeration to keep the lawn . Aerating and dethatching are also required. Dethatching is an efficient method of removing excess thatch (the layer of debris, dead grass, and other organic matter that lies in between grass blades and the soil's surface) from your lawn so that nutrients, air, and water can reach the soil. Table 3. Because of the preponderance of its use it will to some extent always be in the area. Thatch occurs between the soil surface and the green vegetation and is composed primarily of turfgrass roots, stems and crowns. These attachments are coupled to and driven by a triplex greens mower for efficiency, productivity and effectiveness. Mechanical Thatch Control (Removal): This method is by far the most effective, and, in many cases, is the only way to reduce thatch. Treatments wre evaluated on a "Penncross" creepting bentgrass turfgrass turf maintained under putting green conditions (Danneberger et al., 1986). rather than tall fescue and perennial ryegrasses. The new test has 15 entries, along with standards at 19 locations in the U.S. Nine trials are standard test locations at universities, while four sites will have ancillary tests for traffic tolerance, thatch accumulation and anthracnose. Thatch can be an ongoing problem that keeps your lawn from living up to its potential. In a newly seeded 'L-93' creeping bentgrass putting green, topdressing alone, vertical mowing A lawn's thatch is a layer of dead and living roots, stems and other plant parts that naturally forms within the turf. Bentgrass. I have quite a bit of bentgrass in my grass (poa trivialis) and want to get rid of it. The best lawn watering approach is to water more deeply, less frequently. Bentgrass is a grass that requires a lot of maintenance. Verticutting and dethatching arent the same lawn care methods. Other grasses produce less thatch, like perennial ryegrass and tall . Below is Dr. Fry's article. Look for the thatch layer lying directly on top of soil. Thatch is the number one enemy of good putting surfaces. Let Lush Lawn Help. However, thatch-mat depth increased 12% with the biological thatch control agent and 15% with topdressing alone compared with the untreated. Very doubtful that this is creeping bentgrass. A greenhouse experiment using potted bentgrass ( Agrostis stolonifera L.) determined the efficacy of a ligninolytic enzyme, laccase, in reducing organic matter accumulation in the thatch-mat layer . Bentgrass is a grass that requires a lot of maintenance. Other turfgrass species, such as bermudagrass, bentgrass, and Kentucky bluegrass, have creeping growth habits and rapidly build thick thatch layers. All vigorous creeping bentgrasses are strong thatch formers. Another cause of excessive thatch is growing aggressive grass species like Kentucky bluegrass, creeping red fescue, and creeping bentgrass, or stoloniferous grass that spreads through above ground stems. Dethatching is the mechanical removal of thatch, made up primarily of grass, leaves, stems, grass roots and lateral weed growth. High maintenance. . Less than two weeks after the first application the tenacious The collective ensemble of straw-looking stolens is called thatch. Annual care includes dethatching and core aeration to keep the lawn . 007 Bentgrass established on the 15th Green. The thatch layer creates a perched water table around the crowns and stolons because this finer textured layer must be saturated before water will drain into the course-textured sand below. If you dethatch your lawn at the . Thatch occurs between the soil surface and the green vegetation and is composed primarily of turfgrass roots, stems and crowns. Thatch accumulation is the Achilles heel of bentgrass fairway turf. Answer: In general, we would recommend killing the undesirable plants and clearing out the dead plant debris before dethatching and then reseeding the lawn. She recently completed research on this topic. What is lawn dethatching? Thick thatch can block air and moisture from . In North America it is called 'Colonial Bentgrass'. cultivation program to manage thatch and improve infiltration rate. This grass has the capability of spreading and taking other types of grass. Creeping bentgrass can tolerate a range of cutting heights to suit a golf or bowling green e.g. Leaf texture is fine, upright and retains color throughout the fall and winter while excelling at spring green-up. If the thatch gets too thick it absorbs water before it gets to the roots, prevents fertilizer from reaching those same roots and cuts off air and light. Treatments wre evaluated on a "Penncross" creepting bentgrass turfgrass turf maintained under putting green conditions (Danneberger et al., 1986). Have bentgrass in your yard? Nitrogen was applied at the given rate on a monthly basis. Considered a moderate thatch producer which will minimize disruptive maintenance practices. There are a few different ways to dethatch lawn. Unfortunately, the weather doesn't always cooperate. Since fall is a great time to aerate cool-season grasses, this is a very timely topic for those with bluegrass, ryegrass, fescue and bentgrass. more genetically diverse than other bentgrass varieties, developed using 24 different parent plants. There are three ways you can get rid of creeping bentgrass: First method is to spray the individual spots with a non-selective herbicide like Round-Up. Special rakes were developed to rake out the loose ends. Creeping bent is suited for golf, lawn bowls and croquet greens, golf aprons and tees, fairway oversowing, residential lawns and parks in temperate regions. The grass never dries out because of the immensely thick thatch. - Bentgrass invasion is encouraged by light, frequent watering and short mowing. In warm climates, zoysia and Bermuda grasses are prone to forming thatch. And learn how to use a thatch rake. None of these four are well adapted to southern climates. Determi-nations were also included to assess the influence of these mechanical and chemi-cal/nutrient treatments on the content of selected nutrients and the pH level of the USGA green rootzone. Maybe chop some rhizomes and promote some growth. You generally see thatch problems more with cool climate Kentucky bluegrass, creeping red fescue, and creeping bentgrass. It can still be mowed very closely, but it does not have the same problems of stolon production found with Creeping Bent, although some thatch may still be produced. Thatch is a layer of living and dead grass stems and roots. A thatchy bentgrass fairway. Grasses such as bermudagrass, bentgrass, and Kentucky bluegrass build a thick thatch layer over several months and may need to be dethatched yearly. Removing thatch helps you get the best from your lawn. Winterkill of creeping bentgrass (Agrostis stolonifera L.) was common in spring 2014, despite having great cold and ice encasement tolerance.While creeping bentgrass with significant thatch accumulation was disproportionally affected (i.e., tees, fairways and some greens), there was . Leaving grass clippings on the lawn, however, does not necessarily cause an increase in thatch buildup since soil microorganisms can break them down quickly and return a valuable source of balanced nutrients back to the turf. (bentgrass, nimblewill, quackgrass, etc. Measure the thickness. On these fairways that were sand capped and formerly produced firm conditions to play on, thatch depth has accumulated to approximately 2 inches (photo). It requires frequent irrigation, aerating and dethatching, and a relatively high level . Bentgrass is sensitive to warm temperatures and turns brown in summer heat. 4). Like groomers, you are just trying to stand up some of the horizontal bentgrass. Thatch decreases the vigor of turfgrasses by restricting the movement of water, fertilizers, and pesticides into the soil. The best lawn watering approach is to water more deeply, less frequently. Knowing which method, and the benefits of each, can help you do the job correctly, leading to a better looking lawn. In the midst of a summer with 100+ F temperatures, it's worthwhile to consider some of creeping bentgrass's preferences and management strategies that might be helpful to reduce its stress, and yours. Naturally strong resistance to Brown Patch, Downy Mildew, and Dollar Spot. Leon T. Lucas, Ph. A locked padlock) or https:// means you've safely connected to the .gov website. You can use a rake or machine to dethatch and you'll need to apply a lot of . Thatch build up is largely due to stolon development and the slow decomposition rate of thatch in a sand rootzone. Certain grass species and cultivars are more prone to thatch than others. Many landscaping designs in New England utilize cool-season grasses like Bentgrass or Kentucky bluegrass. Thatch is a tightly intermingled layer of living and dead stems, leaves, and roots which accumulates between the layer of actively growing grass and the soil underneath. on Creeping Bentgrass Dr. Barb Corwin Turfgrass Diagnostics LLC The Pythium disease known as Pythium blight, cottony blight or greasy spot, is a high . That being said, infrequent or inadequate cultivation is usually the underlying reason for excess thatch. Lawns that are overwatered, overfertilized, or growing on heavy clay soils may accumulate thatch quickly. to the development of thatch. Mowing: Creeping bentgrass is best suited to bench setting heights between 0.5" and 0.125". 30 mm (high). Bentgrass lawns, the most common type in the Willamette Valley, are best maintained with an annual dethatching. thatch on a creeping bentgrass green con-structed to USGA specifications. Raise the height of cut when greens are under stress. Thatch is a normal component of an actively growing turfgrass, and as long as it is not too thick, it can increase the resilience of the turf to heavy traffic. Seeding with perennial grasses like perennial ryegrass and tall fescue will reduce thatch problems overall. Here are a few tips to improve the efficacy of Tenacity on your unwanted bentgrass in your lawn.Purchase Tenacity here: https:/. Golfers may not care for cultivation (i.e., core aeration, vertical mowing) practices on fairways because of the . 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