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Title: Susceptibility of redbanded and conchuela stink bugs from the Texas Lower Rio Grande Valley to organophosphate and pyrethroid insecticides

Author
item Armstrong, John
item Greenberg, Shoil
item Lopez, Juan De Dios

Submitted to: Subtropical Plant Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/1/2012
Publication Date: 12/1/2012
Citation: Armstrong, J.S., Greenberg, S.M., Lopez, J. 2012. Susceptibility of redbanded and conchuela stink bugs from the Texas Lower Rio Grande Valley to organophosphate and pyrethroid insecticides. Subtropical Plant Science. 64:44-48.

Interpretive Summary: The red banded stink bug (RBSB), Piezodorus guildinii, (Westwood), is recognized as an economically threatening pest of soybean (Glycine max L.) and other legumes in South and Central America (Panizzi and Slansky, 1985, Depieri and Panizzi 2011). However,within the last 15 yrs, RBSB has been expanding in distribution and increasing in density within soybean regions in Florida, Georgia, Texas, and the mid-south states of Mississippi, Arkansas, Louisiana, and even more recently Missouri (Tindall & Fothergill 2011).

Technical Abstract: We report the susceptibility of 2 stink bug species, red banded stink bug (RBSB), Piezodorus guildinii, (Westwood) and conchuela stinkbug, Chlorochroa ligata (Say) collected in the Texas Lower Rio Grande Valley to selected pyrethroid and organophosphate technical grade insecticides. The adult glass vial test (AVT) was used and the most commonly-used insecticides on a variety of crops were evaluated. The baseline susceptibility of the conchuela stink bug as reported by LC50 and LC90 values (95 % confidence Limits) shows that it is highly susceptible to the organophosphates, dicrotophos (Bidrin®), acephate (Orthene®) and the pyrethroids, deltamethrin, (Decis®) and lambda-cyhalothrin (Karate®). The RBSB has a history of being hard to kill in soybean, and the reported LC50 in these assays of 5.06 (3.74 - 7.26) and a LC90 of 26.9 (15.23 – 89.91) for acephate are higher than those reported for Louisiana, where the RBSB has a history of being difficult to control. The RBSB should continue to be monitored for insecticide resistance using the AVT especially with the organophosphate insecticides. Baseline values for susceptibility of RBSB and conchuela stinkbug to insecticides tested are important for future comparisons to monitor development of resistance.