Sep 16, 2018

Posted by | Comments Off on Necrotic Ring Spot (NRS) –

Necrotic Ring Spot (NRS) –

Necrotic ring spot symptoms may initially develop as light green to straw-colored rings or frog eyes in lawn. Photo from CSU Website.

Quick Facts…

  • Necrotic ring spot is caused by a fungus & is a perennial disease of Kentucky bluegrass.  It is considered one of the most common diseases of turf along the front range & the most destructive. Symptoms often develop in late summer.
  • NRS results in irregular circular shapes or Patches sometimes referred to as “frogeye”.  Shapes can range from several inches to several feet in size.  They can be localized or widely scattered throughout the yard.
  • NRS is one of the most widely studied turf diseases however it is the least understood.   NRS may reappear and intensify in mid-summer in successive years and may take several years to control.

Treatment for NRS!

  • Treat with a fungicide. Apply application when fungus is active in spring and in fall.  Apply a second application about 2 – 4 weeks after first one.  A third application may be necessary on severely damaged lawns.  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.
  • Where to get fungicide.  While these products are not restricted use they for the most part are not are not packaged for sale at retail outlets. Therefore, these fungicides are usually applied by professional lawn care operators.  Call us for a free Quote!  Applications usually start around $55 and go higher for more severely damaged lawns.
  • Prepare soil properly before sodding or seeding.
  • Over seed diseased patches with resistant grasses.
  • Do not overwater. Water turf deeper & less often, usually no more than 2 – 3 times a week, without creating water stress.
  • Keep a good turf height. Mow lawn at a height of 2 ½ to 3 inches. Remove no more than 1/3rd of the blade at any one mowing.  Mulching 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.
  • Avoid applying excessive amounts of nitrogen fertilizer.Applications of more than 4 lb total nitrogen per 1000 square feet per year may enhance NRS. Timing of fertilizer applications is as important as the total amount applied.

 

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Aug 23, 2018

Posted by | Comments Off on Pest & Disease Control

Pest & Disease Control

Spider Mites

Necrotic Ring Spot (NRS)

Ascochyta

Fairy Ring

Grub Worm

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Mar 1, 2018

Posted by | Comments Off on What to do to your Lawn in April & May!

What to do to your Lawn in April & May!

“April & May are the best months to Aerate and a good time to put down a Spring Fertilizer.  If you activate your sprinkler system this time of year you are safe from things freezing in ground, however your backflow preventer could freeze up if temperatures fall below 32 degrees for an extended period of time.  To prevent this from happening and to enjoy the ease of using your system, just wrap the pipes on the side of the house with installation or even use a simple blanket and cover with a plastic bag to keep the cold edge off.  It is also a great time to Power Rake before your turf gets too green…call us to see if you could still benefit from a power rake & or fertilization.  Due to the extreme dry winter we have had, we are finding extreme cases of mites & spiders in turf areas.  If you have patches of brown that are not greening up or brown patches that are getting larger…you could possibly have spider mites eating away at your turf…Call us for an evaluation.”

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Apr 14, 2016

Posted by | Comments Off on Bugs to look for in Late April

Bugs to look for in Late April

Bugs to look for in Late April

Late April

Household Insects

Ants:  Foraging ants in homes are common until temperatures allow them to seek food outdoors.

Tree/Shrub Insects

Cooley spruce gall:  Insects continue development and usually begin to produce egg sack in late April.

Lilac/ash borer: Flights of adult moths may begin.

Poplar twiggall fly: Adults emerge and begin to lay eggs in emerging aspen shoots.

Spider mites on pines:  Populations may increase rapidly on ponderosa and other susceptible pines

Spiny elm caterpillar:  Small colonies of these caterpillars may be seen on willow, hackberry, aspen, elm and other trees.

Douglas-fir beetle:  In forested areas, adult emergence, flights and tree attacks may begin.

Brownheaded ash sawfly:  Adults may lay eggs during warm days following bud break.

Zimmerman pine moth:  Approximate treatment timing for overwintered larvae. 

Lawns

Turfgrass mites:  Clover mites continue to feed on lawns and enter homes in nuisance migrations.

Nightcrawlers: Tunneling activities and associated lawn lumps continue.

Midges: Non-biting midges emerge from ponds and mating swarms may be observed over lawns.

Garden

Spinach leafminer: Egg laying and tunneling begins in older spinach foliage.

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Feb 16, 2015

Posted by | Comments Off on Ascochyta

Ascochyta

Ascochyta

Quick Facts…

  • Ascochyta is a fungus that is usually just an aesthetic problem on Kentucky bluegrass lawns in Colorado.  It may also occur on tall fescue and perennial ryegrass.
  • Leaves usually start dying back from the tips & severe areas of affected turf will turn straw-colored however your turf is not dead.
  • Ascochyta can occur throughout the growing season, but is more prevalent in the spring when there are extended wet periods symptoms may develop throughout the growing season but are more common when cool rainy conditions are followed immediately by hot dry conditions. The overall appearance of the disease may resemble drought stress, except that the symptoms of Asochyta blight appear quickly (i.e. sometimes overnight).

Treatment for Ascochyta!

  • Reduce thatch and promote water penetration through the soil by aerating.
  • Sharpen blades & maintain grass height between 2 ½ and 3 inches. Avoid mowing during wet weather.
  • Although the fungus can be spread from one location to another on grass clippings it is unlikely to contribute significantly to disease development because the fungus is already present throughout every lawn.
  • Maintain a balanced fertilizationprogram.
  • Try to maintain uniform soil moisture. Check your sprinkler system to make sure all sprinkler heads are working properly and that water is being distributed uniformly to avoid drought stress. On the other hand excessive irrigation and poorly drained soils may also promote disease development.
  • The damage usually takes several weeks to disappear.
  • If you can’t wait, a fungicide can speed up the healing process especially on more severely damaged lawns…Call us for a free evaluation!

Bleached leaf tips and banding are characteristic of Ascochyta leaf blight.

Ascochyta leaf blight on Kentucky Bluegrass

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