Tree Service Parker CO Necrotic Ringspot – When do You Treat Lawns for Necrotic Ringspot? What is Necrotic Ringspot? This article will give you answers you are seeking.
Necrotic ring spot (NRS) is a disease of lawns that creates dollar-coined-sized or larger circles of dead grass throughout your lawn. It is a chronic fungal disease treated in mid-spring. Because we’ve received questions about NRS recently we wanted to encourage you to take the following actions to get your lawn care ready for a treatment for this fungal condition.
Since we write this post in mid – August, it’s important to help keep NRS under control until next spring. It can be an extremely frustrating lawn care issue and it looks worse this time of year due to the amount of rain.
In fact you’d think the lawn would get greener with rain but with NRS the opposite tends to happen. In fact that is one of the signs a good lawn service looks for in diagnosing an under-performing lawn.
Luckily, with patience and consistency it can be brought under control, if the exact treatments are executed properly and if the weather cooperates.
Here are some tips for what to do now with your Parker lawn care in August and September, to set it up for direct treatments next year.
- Do not overwater. This is perhaps the most important management practice for NRS. It is tempting to irrigate lawns with a history of NRS more frequently. However, this will enhance the disease. Water the lawn to a depth of 6 to 8 inches as infrequently as possible, usually no more than twice a week, without creating water stress. Also check to make sure irrigation heads are working properly and limit overlapping sprays that may create puddles in the yard.
- Follow good management practices on established lawns. Maintain the turf at a height of 2 ½ to 3 inches. Remove no more than 1/3rd of the blade at any one mowing. Since the NRS pathogen attacks the roots and not the leaves, it is not spread by mowers. Returning clippings with a mulching mower may actually help turf recovery by recycling nitrogen during the leaf decomposition process. Core aerate established lawns at least once a year (spring or fall) to help reduce thatch buildup and improve soil drainage. Core aeration equipment may spread the NRS fungus although this is not likely a major means of pathogen movement. Furthermore, the benefits of aeration outweigh potential problems.
- Fungicide timing. Fungicide timing is critical for disease control. Products must be applied in spring before root colonization by the fungus occurs. Make an application in May when soil temperatures reach 65° F at a depth of 2 inches. This usually occurs in mid-May. Do not make the first application too early in the spring because fungicide activity may be lost before the fungus starts colonizing roots. Make a second application after one month. A third monthly application may be necessary on severely damaged lawns. Applications after symptom development or in late fall are not effective. Lightly water the fungicide into the turf (less than ¼ inch) but do not drench the lawn. Fungicide applications only suppress NRS; they do not eradicate the NRS fungus. Therefore applications over several years may be necessary to manage NRS on severely damaged lawns.
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