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Title: Toxicity of selected insecticides to southern green stink bugs determined by adult vial technique: A preliminary report

Author
item Lopez, Juan De Dios
item Latheef, Mohamed - Ab

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 1/8/2003
Publication Date: 1/8/2003
Citation: Lopez, J., Latheef, M.A. 2003. Toxicity of selected insecticides to southern green stink bugs determined by adult vial technique: A preliminary report. Proceedings of the Beltwide Cotton Conference, January 7-10, 2003, Nashville, TN. p. 1494-1496.

Interpretive Summary: Southern green stink bugs are major pests of a number of cultivated crops and orchards such as cotton, soybeans, corn, sorghum, pecans, fruits and vegetables that frequently require insecticide applications for control. Determining susceptibility and monitoring for development of insecticidal resistance are important components of an effective chemical control program. We exposed adult southern green stink bugs to insecticide residue inside a glass vial to evaluate various insecticides recommended for control. Some differences were observed compared to published reports of similar evaluations conducted in other states and with other stink bug pest species. A Louisiana population of brown stink bugs, which are harder to control were more susceptible to acephate than the southern green stink bugs we tested in Texas. Also, southern green stink bugs from Louisiana were less affected by cyfluthrin than those we tested in Texas. These results show that more intensive evaluations are needed to ensure that effective insecticides are identified and are available for use by producers to control this important pest species.

Technical Abstract: An adult vial test (AVT) was used to determine the toxicity of acephate 97 (Orthene), technical cyfluthrin (Baythroid) and dicrotophos (Bidrin) on southern green stink bug, Nezara viridula adults, captured in the blacklight traps in the fall of 2002 in the Brazos River Valley, Texas. LC50 values (95% CL) at 24 h for acephate and cyfluthrin were 4.2312 (3.1352-4.9254) and 0.0443 (0.0311-0.0582) micrograms/vial, respectively. These values were significantly different. A statistically significant probit analysis model for dicrotophos was not developed because of highly variable mortality data. These data are discussed and possible explanations are presented relative to previously published reports.