Wetlands created for wastewater treatment are often planted with vegetation, creating microhabitats that are beneficial for the production of large numbers of mosquitoes. Previous studies have found that wider bands of vegetation reduce the efficacy of Gambusia affinis, the mosquitofish, to control larval mosquito populations. However, the mosquitofish may not always be the best biological control agent. This study examines the effects of vegetation patches on two other predators of larval mosquitoes, backswimmers (Hemiptera: Notonectidae) and arroyo chubs (Gila orcutti). The arroyo chub was chosen for this study since it is a native fish to southern California with a capacity to control larval mosquitoes, and it is also a species of special concern due to urbanization and to competition with introduced fish. Twelve ponds at the UC Riverside Agricultural Experiment Station received additions of Schoenoplectus californicus in one of two arrangements such that 12 0.1m² (or single plant) plots, 4 0.4 m² (or four plant) plots, and 2 0.9 m² (or 9 plant) plots were present. All twelve ponds received additions of Notonecta. Six ponds received additions of 30g of G. orcutti. Early results show a reduction in the numbers of mosquitoes in all ponds, but this may be attributed to seasonal changes. Additionally, in ponds with fish, large Aeshnidae were only found in the 0.4 m² and the 0.9 m² plots, suggesting avoidance of G. orcutti.