Coccinellid immigration to infested host patches influences suppression of Aphis glycines in soybean

► We manipulated coccinellid immigration rates and measured effects on Aphis glycines populations. ► With low aphid pressure, ambient coccinellid immigration suppressed A. glycines. ► Reducing immigration resulted in large increases in A. glycines populations. ► With high aphid pressure, coccinellid and foliar predators together suppressed aphids.