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The 2017 Turfgrass Research Reports Now Online!

(By Jared Hoyle, KSU Turfgrass Research and Extension)

The 2017 Turfgrass Research Reports are now available!!!! See what research projects the KSU Turfgrass Team have been up to.

Click the link below to take you to the Kansas Agriculture Experiment Station Research Report Page.

http://newprairiepress.org/kaesrr/vol3/iss4/

Volume 3, Issue 4 (2017) Turfgrass Research

Research Reports

PDF

Measurement of Evapotranspiration in Turfgrass: Recommended Techniques and Adjustment Coefficients
Kenton W. Peterson, D. Bremer, Kira B. Shonkwiler, and J. M. Ham

PDF

Evaluating Zoysiagrass-Tall Fescue Mixtures in Kansas
Mingying Xiang, J. Fry, and M. Kennelly

PDF

2012 National Turfgrass Evaluation Program Tall Fescue Test: 2016 Data
L. Parsons, Michael J. Shelton, M. Kennelly, J. Griffin, and J. Hoyle

PDF

2013 National Turfgrass Evaluation Program Bermudagrass Test: 2016 Data
L. Parsons, Michael J. Shelton, J. Griffin, and J. Hoyle

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

Don’t forget to follow me on twitter @KSUTurf.

Also, visit our facebook page www.facebook.com/KSUTurf

Time to fertilize cool-season turfgrass

(By Jared Hoyle, KSU Turfgrass Research and Extension)

September is almost here and that means it is prime time for to fertilize your tall fescue or Kentucky bluegrass lawns. If you could only fertilize your cool-season grasses once per year, this would be the best time to do it.

These grasses are entering their fall growth cycle as days shorten and temperatures moderate (especially at night). Cool-season grasses naturally thicken up in the fall by tillering (forming new shoots at the base of existing plants) and, for bluegrass, spreading by underground stems called rhizomes. Consequently, September is the most important time to fertilize these grasses.

Apply 1 to 1.5 pounds of actual nitrogen per 1,000 square feet. The settings recommended on lawn fertilizer bags usually result in about 1 pound of nitrogen per 1,000 square feet. We recommend a quick-release source of nitrogen at this time. Most fertilizers sold in garden centers and department stores contain either quick-release nitrogen or a mixture of quick- and slow-release. (We will talk about slow release in a later article.)

The second most important fertilization of cool-season grasses also occurs during the fall. A November fertilizer application will help the grass green up earlier next spring and provide the nutrients needed until summer. It also should be quick-release applied at the rate of 1-pound actual nitrogen per 1,000 square feet.

So total you only want to use up to 3 lbs of actually nitrogen per 1,000 square feet over September, October and November.

Here are some different ways you can apply the quick release nitrogen source;

Method 1 (Totaling 3 lbs of actually nitrogen per 1,000 square feet)

  • September – 1 lbs of actual N/1,000 square feet
  • October – 1 lbs of actual N/1,000 square feet
  • November – 1 lbs of actual N/1,000 square feet

Method 2 (Totaling 3 lbs of actually nitrogen per 1,000 square feet)

  • September – 1.5 lbs of actual N/1,000 square feet
  • November – 1.5 lbs of actual N/1,000 square feet

Method 3 (Totaling 2 lbs of actually nitrogen per 1,000 square feet)

  • September – 1 lbs of actual N/1,000 square feet
  • November – 1 lbs of actual N/1,000 square feet

Click here for the Kansas Lawn Fertilizing Guide – https://www.bookstore.ksre.ksu.edu/Item.aspx?catId=545&pubId=10639

Always make sure your pride your fertilizer evenly!!!!  You don’t want this to happen.

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

Don’t forget to follow me on twitter @KSUTurf.

Also, visit our facebook page www.facebook.com/KSUTurf

Monthly calendar for cool-season lawns for the rest of 2017.

(By Jared Hoyle, KSU Turfgrass Research and Extension)

I can’t believe it… Where has the summer gone?  I blinked and students are running around campus and just last night it was cool enough to cut the A/C off and open the windows.  Not to mention just in a couple weeks we will be watching college football.

When all of this happens I know I need to be getting out and working on my cool-season lawn.  Time for fertilizer, overseeding existing lawns and establishing new lawns.  So first I want to go back and look at the lawn calendar for cool-season lawns.  Here are some recommendations.

Late-July through August
If you see grub damage, apply a grub killer that contains Dylox. Imidacloprid is effective against young grubs and may not be effective on late instar grubs. The grub killer containing Dylox must be watered in within 24 hours or effectiveness drops.

September
Fertilize around Labor Day. This is the most important fertilization of the year. Water in the fertilizer.

November
Fertilize. This fertilizer is taken up by the roots but is not used until the following spring. Water in fertilizer. Spray for broadleaf weeds even if they are small. Broadleaf weeds are much easier to control in the fall than in the spring. Spray on a day that is at least 50 degrees. Rain or irrigate within 24 hours reduces effectiveness. Use label rates for all products!

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

Don’t forget to follow me on twitter @KSUTurf.

Also, visit our facebook page www.facebook.com/KSUTurf

K-State Radio Network – Overseeding Cool-Season Lawns

(By Jared Hoyle, KSU Turfgrass Research and Extension)

For this week’s horticulture segment, K-State turfgrass specialist Jared Hoyle talks about taking the preliminary steps now for overseeding a cool-season lawn this fall.

Click the link below for K-State Research and Extension Agriculture Today Radio Program hosted by Eric Atkinson.

K-State Bedding Plant Field Day, July 25 – Olathe

The K-State Bedding Plant Field Day is coming up on July 25.

You can click the text below to see the flier with the schedule here:

KState Bedding Plant Field DayTuesday-1b6zu6n

Or you can directly visit the bedding plant field day registration link.

 

 

Alternatively, copy and paste the following:

https://www.eventbrite.com/e/k-state-bedding-plant-field-day-tickets-35609674495

Anthracnose crown rot in putting green turf

We recently received a sample with anthracnose crown rot. Anthracnose can be tricky to diagnose from a distance or a drive-by. The symptoms can look like other diseases or stresses such as physiological root decline. Another tricky thing is that those same stresses can make the turf more prone to anthracnose. Yikes! It’s worth investing in a high-quality hand-lens, and with a good hand lens and a steady-hand you can often see the anthracnose structures lurking down at the base of plants. Sending to the lab as a follow-up is another good step, since we can look for other pathogens that might be lurking in the roots.

The photo below is through a dissecting microscope, but those same dark spines can often be seen with a hand lens. Look for structures on green tissue, not brown/dry tissue. Anthracnose is pretty good at colonizing stuff that is already dead, as an opportunist. When we see it on juicy green tissue that is when the disease is active.

 

For more on anthracnose, including several photos you can check this page:

http://www.bookstore.ksre.ksu.edu/pubs/EP147.pdf

Here is an excellent list of best management practices:

http://turf.rutgers.edu/research/bmpsanthracnose2015.pdf

Last but not least, anthracnose is one of the many diseases covered here:

http://www2.ca.uky.edu/agcomm/pubs/ppa/ppa1/ppa1.pdf

Many of the practices to reduce anthracnose also promote overall turf health. That is, when you implement agronomic practices to promote good rooting you also reduce the risk of anthracnose and other problems. You may not be able to do ALL of the beneficial agronomic practices you would like, due to budgetary limits or lack of equipment or golfers’/greens committee opinions, but the more you can fit in, the better.

Human health – not just plant health! Stay hydrated out there and avoid heat stress.

On this blog we are usually talking about plant health, but here’s a quick switch to human health. We want all of our Kansas green industry folks to stay healthy and safe in the summer heat.

You already know this, but sometimes it is worth reminding ourselves that heat stress and dehydration can be very serious. A friend-of-a-friend of mine got very dehydrated once on a camping adventure, and she was very sick for several days (dizzy, vomiting).

This link has some common-sense tips:

http://online.ksre.ksu.edu/tuesday/announcement.php?id=35357

Take extra care of new crew members who are not used to the heat. For one thing, those folks are less used to it. Second, a new crew member may feel the need to just buck up and take it and be afraid to speak up that they need some shade or a water break. So keep an eye on everyone, but especially those that may be more vulnerable.

Influence of Tall Fescue Baseball Infield Mowing Height on Ground Ball Speed

Influence of Tall Fescue Baseball Infield Mowing Height on Ground Ball Speed

( By Jared Hoyle, KSU Turfgrass Research and Extension and Gage Knudson, KSU Turfgrass Undergraduate Research Assistant)

Summary. Athletic field conditions have shown to influence playability. Results of ball-roll speed studies can be used to predict success of infield hits. Field trials were conducted at Rocky Ford Turfgrass Research Center to determine the influence of tall fescue baseball infield mowing height on ground ball speed and batter on-base success. Mowing heights of 2.5, 5, and 7.6 cm resulted in 1.77, 2.08 and 1.88 s ground ball times, respectively.

Rationale. Tall fescue [Schedonorus arundinaceus (Schreb.)] is a drought tolerant turfgrass species commonly used as a baseball infield playing surface. Cultural management practice studies on athletic surfaces have shown direct influences on playability. Minimal information exists on the influence of infield mowing height and ball-roll speed. Results of ball-roll speed studies can be used to predict success of infield hits.

Objectives. Determine the influence of tall fescue baseball infield mowing height on ground ball speed and batter on-base success.

Study Description. Research trials were initiated on November 21, 2016 at the Rocky Ford Research Center (RF) in Manhattan, KS to determine the influence of tall fescue baseball infield mowing height on ground ball speed and batter on-base success. Research trials were conducted on 30.5 m long simulated tall fescue infield. Two experimental runs were conducted on three different infield mowing height treatments; 2.5, 5, and 7.6 cm. Six individual replications of a simulated ground ball were applied to each infield condition and experimental run. Ground balls were applied with a pitching machine set to 112.6 kph. Simulated ground balls were timed in seconds (s) from simulated pitched ball and bat contact (insertion into machine) to baseball fielder location (30.5 m distance). Successful infield hits were calculated using constant athletic ability data and infield ball-roll data. Data was subjected to ANOVA in SAS and means were separated according to Fisher’s protected LSD at 0.05 significance level.

Results. Mowing heights of 2.5, 5, and 7.6 cm resulted in 1.77, 2.08 and 1.88 s ground ball times, respectively (Figure 1). Utilizing ground ball speed results, researchers were able to predict that a simulated batter, if a ground ball was hit to the shortstop position (30.5 m distance), would result in an unsuccessful at bat if a tall fescue infield was mown at 2.5 cm and successful if mown at 5 and 7.6 cm, utilizing consistent player athletic ability data (Figure 1 and Table 1).

The Effect of Human Insect Repellents on Perennial Ryegrass (Lolium perenne) Growth and Recovery

The Effect of Human Insect Repellents on Perennial Ryegrass (Lolium perenne) Growth and Recovery

(By Jared Hoyle, KSU Turfgrass Research and Extension and Peyton South, KSU Turfgrass Undergraduate Research Assistant)

Summary. Turfgrass damage has been observed from misapplications of human insect repellents. Minimal research has been conducted to determine the cause of the damage. Greenhouse research trials were conducted to survey various human insect repellents on turfgrass growth and recovery. Insect repellents resulted in a wide range of damage. No common trend was observed although research trial shows possible repellents to be utilized around turfgrass that will minimize turfgrass injury.

Rationale. Human insect repellents containing diethyltoluamide (DEET) commonly damage turfgrass due to non-target application. Common visual damage results in two areas of healthy growing turfgrass in the shape of footprints with necrotic and chlorotic turfgrass surrounding. Damage results in unacceptable turfgrass quality and playability. Minimal research has been conducted to explore the influence of human insect repellents on turfgrass injury and recovery.

Damage from bug spray misapplication to turfgrass.

Objectives. Evaluate the influence of human insect repellants on Perennial Ryegrass (Lolium perenne) growth and recovery.

Study Description. Research trials were initiated in November of 2016 at the Throckmorton Plant Sciences Center Greenhouses in Manhattan, KS to determine the influence of human insect repellents on perennial ryegrass (Lolium perenne) growth and recovery. Perennial ryegrass was established in 10 by 10 cm pots at 387 kg ha-1, maintained at 4.4 cm and were irrigated to prevent drought stress. Greenhouse environment was a 12 hr photoperiod at 15.5°C/ 22.2°C (night/day). Insect repellent treatments were applied to perennial ryegrass plants arranged in a randomized complete block design with 4 replications. Treatments included 9 insect repellents and a non-treated control for comparison (Table 1). Five treatments contained the active ingredient DEET. Other commonly used insect repellents were also included for comparison. Collected data included visual percent injury on a 0%- 100% scale, where 10% represented maximum acceptable injury. Data was subjected to ANOVA in SAS and means were separated according to Fisher’s protected LSD at 0.05 significance level.

Results. All treatments except the control resulted in at least 6% turfgrass injury 1 day after application (DAA). Repel Max (40% DEET) and Off Active (15% DEET) resulted in 68% and 30% injury, respectively 21 DAA. At 21 DAA all other treatments resulted in turfgrass injury similar to the non-treated. Insect repellants with the same active ingredient percentage resulted in various perennial ryegrass injury and recovery. Although no different in % DEET, Off Active and Off Family resulted in 30% and 0% injury, 21 DAA, respectively. Results also demonstrate that permanent non-target turfgrass injury could occur if Off Active and Repel Max are applied as a human insect repellent. Further greenhouse and field trials are needed to confirm results as well as determine if other non-labeled ingredients influence turfgrass injury.

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

Don’t forget to follow me on twitter @KSUTurf.

Also, visit our facebook page www.facebook.com/KSUTurf