Armyworms in Rice, Again!

Jeff Gore, Research and Extension Entomologist
By Jeff Gore, Research and Extension Entomologist, Bobby Golden, Agronomist, Delta REC, Mississippi State University and Don Cook, Research Entomologist June 27, 2014 09:40

It appears that 2014 is going to be the year of the armyworm in rice. I have had numerous calls, texts, and Tweets about armyworms in rice over the last week. If you have not had them in your rice to this point, consider yourself very lucky. The one thing that stands out is that no 2 situations are the same. I have had calls that range anywhere from a few small isolated spots, to only on the levees, to large isolated spots, to scattered all across the field. Some trends that I have noticed is that most of the situations are in rice that has not yet been flooded. That’s not to say that they are not in flooded rice, because they are. Just not to the same extent as rice that has not been flooded yet.

As far as management goes, armyworms are not likely to severely hurt yields at this time of year unless they are really heavy and widely distributed across a large percentage of the field. However, one thing to consider is that armyworms can hold the plants back and reduce the uniformity of the crop. Also, the smaller the plants are, the greater the impact will be. The important aspect of the non-uniformity is that it will make management of the crop much more difficult for the rest of the season.

In terms of control, the armyworms we see in rice are very easy to control with a mid-rate of a pyrethroid. If you are finding small worms (< 3/8 inch long), you have a few days until they are big enough to cause significant damage. In contrast, worms that are 1/2 inch or bigger will cause a lot more damage and will need to be controlled sooner.

Finally, as I said earlier, every situation has been different and each field will need to be considered independently when deciding whether or not to spray. You should consider the stage of the crop, the extent of the feeding, and what percentage of the field is being damaged. In many situations it may be difficult to decide. If you need help or have any questions, feel free to call at any time.

 

Print Friendly
Jeff Gore, Research and Extension Entomologist
By Jeff Gore, Research and Extension Entomologist, Bobby Golden, Agronomist, Delta REC, Mississippi State University and Don Cook, Research Entomologist June 27, 2014 09:40
Write a comment

No Comments

No Comments Yet!

Let me tell You a sad story ! There are no comments yet, but You can be first one to comment this article.

Write a comment
View comments

Write a comment

Your e-mail address will not be published.
Required fields are marked*

Subscribe to receive updates

  • Soybean Disease Update: September 5, 2015

    Soybean diseases continue to be observed throughout the MS soybean production area. The number of counties (13, as of 9/4/2015) exhibiting soybean rust has increased over the past several days. However, low levels of infection have been observed at most locations. Frogeye leaf spot, Cercospora blight, target spot, and stem canker also continue to be observed. ...
  • Soybean Harvest Aids

    Several calls have come in over the last week regarding soybean harvest aid options for various scenarios. In some cases, fields have been observed with varying degrees of maturity. In ...
  • Sugarcane Aphid Control with Falling Temperatures

    In 2014 we saw two brief time periods of less than satisfactory control with Transform on sugarcane aphids in grain sorghum across a broad geography. At the time we were mixing a ...
  • Pheromone Trap Counts, August 28. 2015

    Bollworm trap catches remained similar to last week, which is somewhat lower than average for this time of year. Tobacco budworm trap catches were somewhat higher this week. As most ...
  • Defoliating Caterpillars in Peanuts

    We have had numerous calls over the last 2 weeks about caterpillars in peanut from all around the state. In every case, the calls have involved a complex of multiple species including bollworm/tobacco budworm, cutworms, armyworms, saltmarsh caterpillar, loopers, and rednecked peanut worm. ...
  • 3rd Annual Mississippi Sweetpotato Field Day Program- August 27th

    Mississippi State University will host its 3rd Annual Sweetpotato Field Day Thursday August 27 at the Pontotoc Ridge-Flatwoods Branch Experiment Station (8320 Hwy 15 S., Pontotoc, MS 38863).  Registration is ...

More Info By