|Lopez, Juan De Dios|
Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 1/5/2005
Publication Date: 6/28/2005
Citation: Lopez, J.D., Latheef, M.A. 2005. Evaluation in the laboratory of Novaluron to control southern green stink bug. In: Proceedings of the Beltwide Cotton Conferences, January 4-7, 2005, New Orleans, Louisiana. 2005 CDROM. Interpretive Summary: Southern green stinkbugs (SGSBs) have become increasingly important pests of cotton because of decreased use of broad spectrum insecticides to control boll weevil and bollworm/tobacco budworm. Although use of insecticides is the only control option available for SGSB, it is important that applied insecticides don't disrupt the natural enemy complex. Novaluron (Diamond TM 0.83 EC) is a relatively new insecticide that has potential for minimal impact on the beneficial insect complex, but it is important to determine the best timing and application parameters to obtain high efficacy. Although our studies were conducted in the laboratory, results show that applications of this insecticide are best directed at the earlier growth stages of SGSB and that applications that provide better plant coverage should be more effective. Efficacious insecticide use is an important component of an integrated pest management approach for cotton production.
Technical Abstract: The efficacy of novaluron (Diamond TM 0.83 EC) on cotton against southern green stink bug (SGSB), Nezara viridula nymphs was investigated in a spray table using two nozzles, 650033 and 8002E which respectively, delivered 2 and 5 gallon spray rates per acre. The 8002E nozzle produced significantly larger droplets, increased droplet density and increased spray coverage compared to the 650033 nozzle. Regardless of dosage and spray rate, when novaluron was applied at 3, 6, and 9 oz active ingredients (AI) per acre, the age of the nymphal instars influenced mortality significantly with the suppression of small nymphs (2nd instars) being significantly greater than that of either 3rd or 4th instar nymphs. When novaluron was applied at 9 and 12 oz AI per acre with or without crop oil concentrate, the 8002E nozzle significantly increased mortality of 3rd instar nymphs; however, neither dosage nor addition of crop oil concentrate increased mortality of 3rd instar nymphs. Novaluron did not cause a high level of mortality of 4th instar nymphs. This study suggests that the application of novaluron should be directed at 2nd instar nymphs in order to maximize efficacy for control of SGSB on cotton and that applications with increased droplet size and density may increase efficacy.