How to Get Ahead of Lawn Disease, According to a Lawn Care Company Owner
There’s a moment every summer in Illinois when the weather flips. The heat arrives, the humidity settles in, and lawns that looked great in May start showing brown circles, straw-colored patches, and thinning spots that seem to appear overnight.
That’s lawn disease season. And according to Josh Cull, owner of LawnWorks Lawn Care, most homeowners are making it worse without realizing it.
We sat down with Josh to talk about lawn disease: what causes it, how to prevent it, and the honest answer on when a fungicide is actually necessary. His advice might surprise you, especially the part where a guy who applies lawn treatments for a living tells you he’d rather not apply anything at all.
Lawn Disease Prevention Starts With How You Water
Ask Josh what causes most lawn disease problems, and he doesn’t start with fungus. He starts with sprinkler settings.
“I find a lot of people with irrigation systems, where their company comes out and sets up the programs, and they just kind of forget it,” he says. Many systems get set to run every other day, or even every day, and often in the evening. That combination is exactly what fungal pathogens want.
Every lawn disease Josh deals with, from dollar spot to brown patch, needs one thing to take hold: moisture sitting on the grass for an extended period of time. Frequent shallow watering and nighttime watering keep the leaf surface wet for hours on end.
His fix is what turf professionals call deep and infrequent watering. “You want to water fewer times, but with greater volumes,” Josh explains. And timing matters just as much as volume. Watering in the early morning instead of at night means the sun dries the leaf blades quickly, cutting down the hours of leaf wetness that fungal diseases depend on.
If you do only one thing after reading this, check your irrigation controller. Fewer days, more volume, early morning start times.
Dull Mower Blades Open the Door to Fungal Disease
The second piece of lawn disease prevention happens in your garage.
“You go out with your old blades, and they’re dull, and it really tears and creates a wound on the turf plants,” Josh says. Every torn, ragged cut is an open wound, and wounded grass “makes them more susceptible for some of these fungal pathogens to enter.”
A sharp mower blade slices cleanly, and clean cuts heal fast. Pair that with the correct mowing height for your grass type, and you’ve removed one of the easiest entry points lawn disease has into your turf.
Thatch Management: The Sponge Holding Disease Against Your Lawn
The third cultural practice Josh points to is one most homeowners have never thought about: thatch, the layer of dead stems and roots that builds up between the grass and the soil.
“Thatch kind of acts like a sponge and holds that moisture at the surface,” Josh explains. “All of these fungal pathogens are going to require a certain amount of moisture for a certain amount of time. So anything you can do to properly manage the level of moisture at the surface really helps to reduce disease pressure.”
Watering, mowing, thatch. Notice the pattern: all three of Josh’s prevention strategies come down to controlling moisture and protecting the plant. Get those right and many lawn disease problems never get started.
And for lawns that battle the same disease year after year? Josh has an answer for that too: overseeding with newer turf varieties bred for better disease resistance, so the lawn itself is harder for those pathogens to infect.
How LawnWorks Helps With Lawn Disease Control
Cultural practices are the homeowner’s half of the equation. So what does the lawn care company do?
Josh is upfront that a lawn care program isn’t a camera pointed at your yard. “Over the course of their typical program, we’re going to be on their lawn about once every six weeks, and a lot can happen in those six weeks,” he says.
That’s why LawnWorks is built around two things: trained eyes and fast communication.
Every LawnWorks technician is trained to recognize turf diseases, and the team meets regularly to stay ahead of what’s coming. “We just had a meeting Monday,” Josh says. “It was like, hey, we’re going to start seeing a lot of dollar spot, we’re going to see brown patch, these are things to be on the lookout for.”
The other half is you. Josh gives every customer the same standing instruction:
“If you see something, say something. You don’t have to know what it is, but if something looks off, let us know immediately. We’ll come out, take a look, diagnose the issue.”
That last part matters more than most homeowners realize. What looks like lawn disease could be an insect problem, drought stress, or normal summer dormancy. Each one has a completely different fix, which is why a LawnWorks manager comes out to diagnose the issue in person before anything gets applied.
When Is a Fungicide Actually Necessary?
Here’s where Josh says something you don’t often hear from a company that applies lawn treatments.
“We use fungicides. It sounds odd because I’m in the business of applying chemicals, but I don’t like to apply something if it’s not needed.”
When a disease is diagnosed, the first question isn’t which fungicide to use. It’s what’s feeding the problem. “We can go back to those cultural practices,” Josh says. “Hey, what does your watering program look like?” If the customer is watering at the wrong times of day, the first prescription is often to fix the watering and see if the disease pressure drops on its own.
Sometimes the answer isn’t a fungicide at all. It’s fertilizer. “Certain fungal infections thrive in low nitrogen situations,” Josh explains. If it’s been a while since the last fertilizer application, a properly timed dose of nitrogen combined with corrected watering and mowing can help the lawn simply grow out of the disease.
And when a fungicide is genuinely needed? “A lot of times it is,” Josh acknowledges. That’s when targeted lawn disease treatment goes down, applied by a trained technician to the diagnosed problem, not sprayed across the lawn on a guess.
The Bottom Line on Lawn Disease
Josh’s lawn disease philosophy fits in four lines:
- Water deep, infrequently, and early in the morning.
- Mow at the right height with sharp blades.
- Manage your thatch so moisture can’t camp at the surface.
- When something looks off, say something, and let a professional diagnose it before anyone applies anything.
It’s a refreshingly honest approach from a company that could easily sell a fungicide application to every customer who calls about a brown spot. Instead, LawnWorks diagnoses first, fixes the cause, and treats when treatment is what the lawn actually needs.
Seeing dollar spot, brown patch, or mystery spots in your lawn? Contact LawnWorks Lawn Care and a manager will come out, diagnose the issue, and recommend the right lawn disease control plan for your yard.
