Prostrate knotweed is currently germinating in thin areas next to sidewalks, cart paths, driveways and other hotspots. Knotweed is often confused with crabgrass at this early stage. Knotweed leaves have rounded leaf tips whereas crabgrass has leaf tips that come to a dull point (See photos). Crabgrass also has veins running lengthwise (parallel veination) whereas […]
The summary of our turfgrass research in the year 2008 is now available at www.agry.purdue.edu/turf/report/2008/index.html. The overall goal of our research program is to minimize inputs while maintaining turf quality, minimizing costs, and further protecting our environment. Our research summary contains over 20 reports of on-going research at Purdue University . The report is a cooperative […]
Superintendants and lawn care professionals in the southernmost counties of Indiana should be advised that adult billbug activity has already been documented at one of the monitoring sites in the Evansville area. Mr. Jeff Sexton, Assistant Superintendant at Rolling Hills Country Club in Newburgh, Indiana captured his first billbugs adults of the year last week. […]
During spring green-up, lawns may reveal many variations in color, growth rate, and leaf width. This variation can be due to some of the following reasons: Species and cultivars: Perennial ryegrass is always the first of the desired cool-season grasses to green-up, followed by tall fescue and eventually Kentucky bluegrass (Fig. 1). Even within a species, […]
I’ve gotten a number of calls on winter damage on lawns and other high mowed turf areas. Thankfully this is fairly rare in most winters throughout Indiana. Winterkill can be fairly complex resulting from desiccation with drying winds, freezing of the plant crown with quickly dropping temperatures after spring green up, and/or from direct cell […]
Though lawns in southern Indiana may have already been mowed a couple of times, mowing is just starting from Indianapolis north. Mowing is the most expensive and laborious maintenance practice on turf, but it also has the largest effect on long-term performance: It is better to mow too early rather than too late in the […]
Many different strategies exist on spring fertilization, but the one fact agreed upon by all turf specialists is to avoid applying heavy nitrogen (N) rates in March or April. Heavy rates would be anything greater than 0.75 lbs of quickly available N/1000 ft2, which causes excessive shoot growth and results in frequent mowing. Furthermore, excess […]
Though spring is not our favorite time to seed, it’s important to seed as soon as possible to allow the cool-season grasses to germinate prior to crabgrass. Crabgrass germinations can occur at soil surface temperatures as low as 50F, but germination is slow and these plants (hopefully) may be killed by an ensuing frost. Most […]
By popular demand, we have joined with Michigan State to include Indiana sites in GDD Tracker (http://www.gddtracker.net/). This site allows you to quickly and easily check your current growing degree day accumulation. It also uses a number of models to help with decisions on timing of growth regulators for Poa annua seedheads, preemergence herbicides for crabgrass, and […]
Six teams traveled last week to the International Golf Industry Show in New Orleans, LA to compete in the 15th annual Golf Course Superintendents Association of America (GCSAA) Collegiate Turf Quiz Bowl. This competition consists of a 3.5 hour written examination that consists of the identification of seeds, turfgrasses, diseases, insects and weeds. In addition […]
This publication describes the role pesticides play in Integrated Pest Management (IPM) programs and introduces pesticide use strategies that reduce exposure to people, nontarget animals, and the environment.
For decades, discussions among scientists and the public have focused on the real, predicted, and perceived risks that pesticides pose to people and the environment. Each use of a pesticide poses some level of risk, so it is not surprising that scientists, the regulated community, government officials, and the public need a realistic understanding of the risks associated with pesticide use. We must analyze how risk is assessed, identify the risks, and determine an appropriate level of concern.
Summary: This study showed that Dismiss and Echelon provided excellent preemergence yellow nutsedge control, but these herbicides should not be used in a tall fescue seedbed. Tenacity applied twice at 0.1 87 lb/A provided a level of yellow nutsedge control similar to Dismiss and Echelon. However, Tenacity works slowly and must be applied twice to […]
Yellow nutsedge (Cyperus esculentus) is a common, persistent and troublesome weed in lawns and landscapes in Nebraska. This is especially true from Kearney east into Iowa. Yellow nutsedge thrives in waterlogged soil and their presence often indicates that drainage is poor, irrigation frequency/quantity are excessive, or sprinklers/valves are damaged and leaking. Once this tenacious weed […]
Yellow nutsedge is now one of the most common weeds in lawns, athletic fields and golf turf. Even though all textbooks say it thrives in wet areas, we see some of our worst yellow nutsedge infestations in dry years. Cultural controls will always help, but the standard herbicides are Basagran, SedgeHammer (formerly Manage), Certainty, and […]
There are literally thousands of fertilizers and fertilizer/pesticide combinations available to homeowners and professionals. Therefore, we can’t recommend how many pounds of a specific fertilizer to apply, but rather we must recommend fertilization rates in pounds of nitrogen per thousand square feet or lbs N/1000 sq ft. You can use our fertilizer calculator at www.agry.purdue.edu/turf/fertcalc/Fertilization%20calc.html […]
There are many, many formulations and combinations of preemergence herbicides available for the professional. Following are some suggestions for purchasing and using preemergence herbicides. Control from every preemergence herbicide can vary from year to year, or location to location. Therefore, you can’t judge the performance of a product or a specific rate of that product […]
For those making the trip to New Orleans for the Golf Industry Show, the Purdue Alumni and Friends Reception will be held Thursday, February 5, 6:00 to 8:00 pm in the Bayoe Jean Lafitte room of the Embassy Suites, 315 Julia Street. It’s a great opportunity to catch up with your classmates and old friends. […]
Even though the drought has limited some broadleaf weed applications this month, we are now in the prime season for broadleaf weed control. Actually there is plenty of time left for good control. Nebraska research reported in 2002 showed 2,4-D and/or dicamba were far more effective in controlling dandelions and Canada thistle when applied 1 […]
This summer saw some extensive billbug damage in many parts of Indiana. Obvious damage to Kentucky bluegrass in the central and northern parts of the state are not uncommon and can usually be attributed to the bluegrass billbug. However, reports of severe damage to Zoysiagrass in the Evansville area really caught my attention. Zoysiagrass is […]
