Look Out for the Armyworm Invasion

While it’s only summer, the continued rains could put us in prime conditions for the Fall Armyworm. This is a common pest of bermudagrass, sorghum, corn, wheat and rye grass and many other crops in north and central Texas, but it can affect your lawn and landscape. Larvae of fall armyworms are green, brown or black with white to yellowish lines running from head to tail. A distinct white line between the eyes forms an inverted “Y” pattern on the face. Four black spots aligned in a square on the top of the segment near the back end of the caterpillar are also characteristic. Armyworms are very small (less than 1/8 inch) at first, cause little plant damage and as a result often go unnoticed. Larvae feed for 2-3 weeks and full-grown larvae are about 1 to 1 1/2 inches long. Given their immense appetite, great numbers, and marching ability, fall armyworms can damage entire fields, pastures, or lawns in a few days.

Once the armyworm larva completes feeding, it tunnels into the soil to a depth of about an inch and enters the pupal stage. The armyworm moth emerges from the pupa in about ten days and repeats the life cycle. The fall armyworm moth has a wingspan of about 1 1/2 inches. The front pair of wings is dark gray with an irregular pattern of light and dark areas. Moths are active at night when they feed on nectar and deposit egg masses. A single female can deposit up to 2000 eggs and there are four to five generations per year. The fall armyworm apparently does not overwinter in north Texas but survives the winter in south Texas. Populations increase in south Texas in early spring and successive generations move northward as the season progresses.

Parasitic wasps and flies, ground beetles, and insect viruses help suppress armyworm numbers. However, these natural enemies can be overwhelmed when large numbers of migrating moths move into an area and weather conditions favor high survival of eggs and larvae.

Management of fall armyworm outbreaks in pastures and hay fields often occur following a rain which apparently creates favorable conditions for eggs and small larvae to survive in large numbers. Hay fields with a dense canopy and vigorous plant growth are often more susceptible to armyworm infestations than less intensely fertilized and managed fields. Irrigated fields are also susceptible to fall armyworm infestations, especially during drought conditions. Infestations that develop in volunteer wheat and weedy grasses in ditches and around fields can be a source of armyworms that can move into adjacent crops.

Look for fall armyworm larvae feeding in the crop canopy during the late evening and early morning and during cool, cloudy weather. During hot days, look for armyworms low in the canopy and on the soil surface where they hide under loose soil and fallen leaves. Kneeling on the ground and parting the grass can reveal armyworms. A sweep net is very effective for sampling hay fields for fall armyworms. When fields are wet with dew or rain, armyworms can be detected by walking through the field with rubber boots as the worms will stick to the boots. Small larvae chew the green layer from the leaves, creating a “windowpane” effect and later notch the edges of leaves. Look for this feeding damage and if detected, look more closely to assess the infestation.

The key to managing fall armyworms is frequent inspection of fields to detect infestations before they have caused economic damage. Once larvae are more than ¾ inch long, the quantity of foliage they eat increases dramatically. During their final 2-3 days of feeding, armyworms eat 80% of the total foliage consumed during their entire development.

The density of armyworms sufficient to justify insecticide treatment depends on the stage of crop growth and value of the crop. Seedling plants can tolerate fewer armyworms than established plants. Infestations of more than 2-3 armyworms (1/2 inch or longer) per square foot may justify an insecticide application. If practical, apply insecticides early in the morning or late in the evening when armyworm larvae are most active and therefor most likely to come into contact with the insecticide spray.

If the field is near harvest, an early harvest, rather than an insecticide treatment, is an option. One the field is cut, most of the armyworm will die due to lack of food and exposure to high temperatures. In some cases, armyworms can move into an adjacent field and continue to feed.

There are products labeled for chemical control; contact your local Extension Office at 254-435-2331 for a list of approved chemical options. Relatively new this year is a formulation of a virus that kills only fall armyworm and beet armyworm.  The biological insecticide has reportedly been effective against fall armyworm infesting sorghum in Australia. It is labeled for hay and pasture and several other crops in the US. However, little is known about its effectiveness under field conditions in the US and more field data are needed before it can be recommended but watch for this in coming years.

 

For even more details on the armyworm and prevention check out this information:  Armyworm Fact Sheet 2019

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