Use of feeding stimulants to enhance insect growth regulator-induced mortality of fall armyworm (Lepidoptera: Noctuidae) larvae

• Published in: The Florida entomologist 1993-06, Vol.76 (2), p.316-326
• Main Author: Chandler, L.D. (Insect Biology and Population Management Research Laboratory, USDA, ARS, Tifton, GA)
• Format: Article
• Language: English
• Subjects: Armyworms; CONTROL DE INSECTOS; DIFLUBENZURON; DRUGS; Entomology; INHIBIDORES DESARROLLO INSECTOS; INSECT CONTROL; INSECT GROWTH REGULATORS; Insect larvae; Insecticides; Juvenile hormones; LARVAE; Larval development; LARVAS; LARVE; Lepidoptera; Life tables; LUTTE ANTIINSECTE; MEDICAMENT; MEDICAMENTOS; MORTALIDAD; MORTALITE; MORTALITY; Noctuidae; PHAGOSTIMULANTS; REGULATEUR CROISSANCE INSECTE; rh-5992; SPODOPTERA FRUGIPERDA; Stimulants; Symposium: Fall Armyworm '92; VIGNA UNGUICULATA
• ISSN: 0015-4040; 1938-5102
• DOI: 10.2307/3495731

The mortality of fall armyworm (FAW), Spodpoptera frugiperda (J. E. Smith), larvae was significantly increased when they fed on leaves of southern pea Vignaunguiculata [L.] that had been treated with either of two insect growth regulators (IGRs) (RH-5992 and diflubenzuron), in combination with KonsumeR, a cottonseed flour based insect feeding stimulant. Larval mortality was increased 2 and 3 days after treatment when Konsume (10% solution) and RH-5992 at 0.001 and 0.01% active ingredient [AI] were applied in combination, respectively. Similarly, a 10% solution of Konsume enhanced the effects of diflubenzuron (0.01% AI) on FAW larvae 4, 6, and 7 days after treatment. A 5% solution of Konsume mixed with diflubenzuron (0.001% AI) resulted in significantly greater fall armyworm larval mortality 2-5 days after treatment compared with diflubenzuron alone. The feeding stimulants Nu-LureR, CoaxRand Konsume all performed similarily against FAW larvae when mixed with either RH-5992 or diflubenzuron. However, Nu-Lure and Coax mixed with the IGRs did not significantly increase fall armyworm mortality above that caused by the IGRs alone. The simultaneous use of a feeding stimulant, such as Konsume, may provide an effective tool to increase toxicant activity of RH-5992 or diflubenzuron, and decrease the time needed to effect death of fall armyworm larvae. /// Se incrementó la mortalidad larvaria de (FAW), Spodoptera frugiperda (J. E. Smith) cuando estas fueron alimentadas con hojas de alverja (Vigna unguiculata [L.]) la cual había sido tratada con dos reguladores de crecimiento (IGRs) (RH-5992 y diflubenzuron), en combinación con KonsumeR, un estimulador del apetito usando como base torta de harina de algodon. La mortalidad larvaria se incrementó 2 y 3 días despues del tratamiento cuando se aplicó la combinación de Konsume (solucion del 10%) y RH-5992 al 0.001 y 0.01% ingrediente activo. Similarmente, una solución del 10% de Konsume mezclada con diflubenzuron (0.001% IA) dieron como resultado una alta mortalidad de larvas de FAW, 2-5 días después de tratamiento comparadas con el diflubenzuron solo. Los estimulantes del crecimiento, tales como Konsume, pueden ser un arma efectiva para incrementar la actividad toxica de RH-5992 o diflubenzuron, y disminuír el tiempo necesario para causar la muerte de la larva del cogollero del maíz.