Rainfastness of Selected Insecticides with Adjuvants for Control of <I>Lygus lineolaris</I> in Cotton

Flynn, Sean

Rainfastness of Selected Insecticides with Adjuvants for Control of Lygus lineolaris in Cotton

Tuesday, January 7, 2014: 2:15 PM

Galerie 2 (New Orleans Marriott)

Sean L. Flynn , University of Arkansas Department of Entomology

Gus Lorenz , University of Arkansas

Glenn Studebaker , University of Arkansas Cooperative Extension Service

Nichole M. Taillon , Cooperative Extension Service, University of Arkansas

Andrew Plummer , Cooperative Extension Service, University of Arkansas

Michael Chaney , Cooperative Extension Service, University of Arkansas

Ben C. Thrash , University of Arkansas Department of Entomology

Derek L. Clarkson , University of Arkansas Department of Entomology

Luis Orellana , University of Arkansas Department of Entomology

Mallory Everett , University of Arkansas Department of Entomology

Logan Towles , University of Arkansas Cooperative Extension Service

Growers who have to make timely chemical applications in mid-summer sometimes run into the problem of “pop-up” showers coming shortly after their applications. These showers can have a significant cost to growers if the chemicals being used do not have rainfastness labeling. Studies were conducted both in the field and greenhouse to evaluate the rainfastness of four insecticides and whether the rainfastness of the insecticides could be improved by mixing four adjuvants into the application. The insecticides, Centric (thiamethoxam), Orthene (acephate), Bidrin (dicrotophos), and Transform (sulfoxaflor); all are currently recommended for control of tarnished plant bug (Lygus lineolaris) in Arkansas and the Midsouth. The four adjuvants used in the study were: 1% crop oil concentrate, 0.25% nonionic surfactant, 0.25% organosilicate, and 0.5% methylated seed oil/ nonionic surfactant. The studies simulated rainfall at 0, 1, 3, 6, 12, and 24 hours after application, with a no rain check used for comparison. Insect mortality was checked at 24 hours (greenhouse) and 48 hours (greenhouse and field) after infestation.