View Full Version : Fungicides
04-08-2000, 09:24 PM
I have a customer that has fusarium blight(necrotic ring spot and some sign of summer patch) in some large sections of the yard. It was treated once last oct. by a different lawn company, but I'm curious if it would need further treatments. The lesco rep mentioned some products such as Banmax and Tusum? being effective. I was wondering if anyone has used any of these products with success or if you've had better luck with a change in practices such as more aerations, watering changes,etc... And if you have any experience on how long a lawn recovery might be, it would be appreciated!<p>Thanks for any and all replies!<br>This is a great forum.<p>James (up Minnesota way)<br>
04-08-2000, 10:34 PM
James, if you are going to try to treat this "patch" disease, you must get a positive diagnosis, necrotic ring spot or summer patch. Treatments are not exactly the same, but either will be very expensive. While you may use the same fungicides, timing and concentrations may differ. Find if your state diagnostic lab can positively identify for you; if no, maybe they can suggest who will.<p>In my experience, patch diseases run a five year cycle:<br>1st year- a few noticeable rings<br>2nd yr- starting to look really bad<br>3rd yr- a disaster<br>4th yr- similar to 2nd<br>5th yr- similar to first.<br>Have noticed this pattern 5-6 times in last 15 yrs. Almost seems that as fungus population increases, some predator organism comes in and demolishes it.<p>Have tried extra aeration and fungicides; didn't seem to make much difference compared to doing nothing. Biggest cultural assist is syringing lawn in midday summer heat. The fungus is not directly killing grass, but is interfering in water uptake by the grass root. Grass dies in summer because it cannot get moisture to survive in heat. Syringing -just wetting grass for 10-15 min- cools the grass dramatically. The evaporation of the water draws heat from the grass surface, cooling the immediate environment of the grass. Would do the syringing at peak of daily heat, 1-2 pm here.<p>Another possible help is to limit or discontinue use of preemergents on the infected lawn (just my idea, never saw research justifying this). Since most pre-ems are root inhibitors, they also stress your grass roots to some extent. In my experience, you will not see enhanced root growth in turf until 2-3 years after last pre-em application.<br>----------<br>Jim<br>North central Indiana<p><br>
04-13-2000, 08:45 AM
Thanks for the reply, Groundkeepers! We have decided to just wait and see how the lawn goes this summer. This fall we may reseed if the problem appears to be decreasing. Thanks also for the tip on wetting the yard at midday.<p>James<br>
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