Horticulture Hotline 08/07/17
By Bill Lamson-Scribner
A friend of mine that grew hay used to say he could hear
army worms munching on the pasture as they crossed the fields. Since army worms
eat the green leaves off the plant, he would lose big hay dollars to this worm.
Athletic fields, golf courses, and home lawns lose the aesthetic value of the
green grass, and the worms thin the canopy of the grass where weeds will move
in if given a chance. Prostrate growing weeds like spurge, lespedeza and Virginia
Buttonweed seem to come in the fastest.
What bothers me the most is you work all summer on your
grass to have it looking nice, and once it starts to slow down for the winter,
fall army worms and then sod webworms attack the grass. Look for areas that
appeared to have been mowed low and with a dull blade. You can see that the
leaf blades have been chewed. Also thatch type debris will be churned up on the
surface. Birds and low flying wasps are also predators of army worms. Thanks to
cell phones last year, I took a cool picture of a wasp attacking the head of an
army worm. I think my definition of ‘cool’ has changed over the years.
Since army worms are in direct contact with the ground, they
are very easy to control. Bug Blaster, Bifen, Sevin, Cyonara and Acephate will
all put a hurting on army worms. Thuricide (Bt) and Spinosad are organic
products that will also work well if you get them while the worms are small.
Since the population of worms is so high and hit so hard, keep your eye out for
a second hatching.
For those of you with St. Augustine and Centipede, keep your
eye out for the sod web worm. Watch for moths in your yard around dusk. If you
begin to see a moth that gets out of the grass, flies for 6-10 feet then lands
again (like a bobwhite quail for you bird hunters) you may want to consider
using one of the above mentioned products. Usually sod web worms would not come
out until September / October; however, with the crazy weather we are having,
scouting for them could not hurt.
Now is the time to put out preemerge products in the lawn
and beds to prevent those small seeded annual weeds. Henbit, chickweed, Poa
annua (annual bluegrass), cudweed and lawn burweed are a few of the winter
weeds that would like to occupy your lawn and flower beds. Poa annua (the green
grass that is very visible in February and March) and lawn burweed (the
prostrate growing weed that develops a sticker) are usually the most hated of
the winter weeds. Some people use profanity while describing them at the
counter of Possum’s!
If your yard has thatch, drainage, or compaction issues, now
is a great time to aerate your lawn (and beds where possible) before you apply
your fall preemerge. Aeration is a great cultural practice, which will among
other things help your roots grow throughout the winter giving you a head start
for the spring.
In my travels this week, I saw brown patch (large patch)
fungus in several yards, and the “nasty rascal the chinch bug” is still sucking
the life out of many lawns. Gray leaf spot is still alive and doing well. With
all the rain, fire ants are mounding up everywhere – be careful where you step!
With all the rain, mosquitoes are out and biting, and the
grass is growing like crazy. Does your mower blade need to be sharpened or
replaced?
Always read, understand and follow product label. The
product label is a Federal Law.
