Ld. Chandler, USE OF FEEDING STIMULANTS TO ENHANCE INSECT GROWTH REGULATOR-INDUCED MORTALITY OF FALL ARMYWORM (LEPIDOPTERA, NOCTUIDAE) LARVAE, The Florida entomologist, 76(2), 1993, pp. 316-326
The mortality of fall armyworm (FAW), Spodpoptera frugiperda (J. E. Sm
ith), larvae was significantly increased when they fed on leaves of so
uthern pea Vignaunguiculata [L.] that had been treated with either of
two insect growth regulators (IGRs) (RH-5992 and diflubenzuron), in co
mbination with Konsume(R),a cottonseed flour based insect feeding stim
ulant. Larval mortality was increased 2 and 3 days after treatment whe
n Konsume (10% solution) and RH-5992 at 0.001 and 0.01% active ingredi
ent [AI] were applied in combination, respectively. Similarly, a 10% s
olution 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 greate
r fall armyworm larval mortality 2-5 days after treatment compared wit
h diflubenzuron alone. The feeding stimulants Nu-Lure(R), Coax(R) and
Konsume all performed similarly against FAW larvae when mixed with eit
her RH-5992 or diflubenzuron. However, Nu-Lure and Coax mixed with the
IGRs did not significantly increase fall armyworm mortality above tha
t caused by the IGRs alone. The simultaneous use of a feeding stimulan
t, 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.