2011 Annual Report 1a.Objectives (from AD-416) Determine effects of landscapes on population growth of major pests, stink bugs in Bt cotton. Conduct research to understand why stink bugs are important pests on Bt cotton. 1b.Approach (from AD-416) 1) Sample stink bug populations at the landscape level to confirm sequence of habitats used. . 2)Estimate net reproductive rate and inter-patch movement, parametize and fit model using data to predict colonization of cotton and effects of landscape structure on colonization. 3.Progress Report This project is related to objectives 1A, 1B and 1D of the inhouse project: (1A) Study the role of landscape make-up on populations of stink bugs; (1B) Evaluate semi-field bioassays for the effects of relative crop quality on major crops used simultaneously by stink bugs; (1D) Assess survival of stink bug egg masses in soybean, cotton, and peanut. The second year of a study of the effects of landscapes on stink bug populations in southern Georgia. Comparisons of two regions in southern Georgia differing in scale of production of corn indicated that the higher corn region always had more stink bugs in corn, peanut, and cotton than in the region with less corn. Stink bugs in soybean were similar in both regions. Overall, peanuts and cotton tend to have lower numbers of stink bugs than corn and soybean in both regions. The exception was one peanut field in one year which had numbers of stink bugs and estimates of their survival as high as those in soybean in both regions. Estimates of survival indicate that there were regional differences in survival in peanut and cotton with higher survival in the high corn region. There were also regional differences in fire ants. More fire ants were found in the low corn region, but over all crops in both regions the numbers were always highest in peanut and cotton than in soybean and corn.