Laboratory, microfield, and field trials were conducted on Heliothis virescens and/or Heliothis zea to determine the contact ovicidal effectiveness of Mobay cotton products relative to other compounds. The data generated indicate ovicidal effectiveness of Baythroid, Guthion, Bolstar and Monitor.

The most active ovicidal Mobay products were Baythroid and Guthion. Even though these materials showed a high level of effectiveness in laboratory testing, field testing resulted in a lower ovicidal effect. This was possibly due to whether or not the spray deposit actually contacted the egg. This lower level of field efficacy was true for all ovicidally active products tested. The strategy of maintaining flexibility of application with multiple cotton products against is supported as one tool in resistance management. From these results, targeting for the egg stage with an ovicide/larvicide such as Baythroid or an ovicide such as Guthion, in combination with a larvicide such as Bolstar would be useful approaches to Heliothis management in cotton.