Project Summaries

09-502TX  Project Manager: P. F. O'Leary

INTEGRATED PEST MANAGEMENT FOR STINK BUG MANAGEMENT IN THE COASTAL BEND OF TEXAS

Stephen Biles, Texas AgriLife Extension Service

Boll feeding damage caused by various insect species in the order Hemiptera continue to emerge as an economic pest of cotton. With advancements in cotton such as Bacillus thuringiensis (Bt) in selected varieties and practices of boll weevil eradication, new emerging insect pests are becoming problematic. These insect pests include the stink bugs (Pentatomidae) and plant bugs (Miridae). A study was initiated in 2012 at Port Lavaca, Texas to evaluate the economic threshold (ET) of boll feeding insects in cotton. The trial consisted of four treatments 1) an untreated check, 2) weekly automatic insecticidal application, 3) insecticide applications based on the ET level of 20% bolls with feeding damage and 4) an application at 50% boll feeding damage. Dicrotophos (Bidrin®) was the insecticide used for all applications. Boll damage was evaluated by randomly selecting twenty, 1-inch bolls from each plot on a weekly basis starting 10 days after first bloom. Each boll was visually assessed for external feeding damage and
then further evaluated on internal feeding damage. The weekly automatic treatment received a total of three insecticidal sprays and the 20% internal feeding treatment received two applications. In the final week of sampling, statistical differences in boll feeding were observed between the untreated check and the two insecticidal treatments, but not observed between the two insecticidal treatments. No differences in yield or fiber quality were found between treatments. Further studies should be conducted to better evaluate the threshold for different regions.

 

Project Year: 2012
 

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