is part of the Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

  • American Agriculturist
  • Beef Producer
  • Corn and Soybean Digest
  • Dakota Farmer
  • Delta Farm Press
  • Farm Futures
  • Farm Industry news
  • Indiana Prairie Farmer
  • Kansas Farmer
  • Michigan Farmer
  • Missouri Ruralist
  • Nebraska Farmer
  • Ohio Farmer
  • Prairie Farmer
  • Southeast Farm Press
  • Southwest Farm Press
  • The Farmer
  • Wallaces Farmer
  • Western Farm Press
  • Western Farmer Stockman
  • Wisconsin Agriculturist

Bollworm alert — Arkansas soybeans

We have been experiencing a high level of bollworm activity in Arkansas soybeans.

Numbers continue to increase and we have observed and had reports on numbers as high as 75 bollworms per 25 sweeps. We have seen many fields at levels from 25 to 40 per 25 sweeps.

As this situation has spread across the state we are beginning to see less than adequate control with pyrethroids such as Karate, Mustang Max, Brigade, etc.

This situation was first observed in Louisiana and Mississippi and now we are beginning to see where applications are not cleaning up infestations of bollworms and in several cases failing to reduce numbers below threshold. In some cases, application may be a factor but, certainly, when the number of failures increases dramatically other factors may be involved.

Here are some recommendations for treating bollworms, particularly in high infestation level situations:

Application volume of 5 gallons per acre by air and 10 gallons per acre by ground.

Add a surfactant or crop oil. With the high heat we are experiencing this may help get the material down in the canopy.

In high infestations (2X threshold), tankmix pyrethroid with 0.5 pound acephate to improve control.

Remember, when sampling for bollworm you have to “get in there” and dig them out. Sweep deep in the canopy and make visual observations of the plant as you go. Many people are underestimating the bollworm population due to poor sampling technique.

TAGS: Soybean
Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.