Technical Abstract: Local diversification of vegetation is used extensively to reduce pest pressure in crops, but little is known about effects of landscape diversity on pest metapopulation dynamics. Many polyphagous pests sequentially use crops and uncultivated habitats in landscapes dominated by annual crops. As these habitats may consume or export individuals, understanding the scale and temporal variability of source and sink effects is critical for manipulating landscapes to enhance pest control. We evaluated how the spatial arrangement of crops and uncultivated habitats affect population density of Lygus hesperus in cotton in California. During early and late season over three years we examined source and sink effects of six crops and uncultivated habitats along with variation in insecticide applications and flowering date. Factors with consistent effects included cotton and uncultivated habitats as sinks, seed alfalfa as a source, and flowering date that was positively associated with Lygus density. Safflower, forage alfalfa, tomato, sugar beet and insecticide applications had variable in inconsistent effects. A multiple regression model including the four consistent factors from the 1st two years significantly predicted Lygus density in cotton in the 3rd year at a scale of 2.75 km and accounted for 52% of the variation in density. These results suggest that manipulation of crop placement and planting date has the potential to regulate Lygus populations in cotton.