Research has shown that hedgerows of native California flowering shrubs planted along the edge of a crop field help keep crop pests under control by increasing the activity of natural enemies. UC Agriculture and Natural Resources and UC Berkeley researchers analyzing hedgerows in Yolo County have found that not only are farmers diversifying their land by planting hedgerows, but those plantings are attracting natural enemies that provide economic benefits. The two-year study of hedgerows planted adjacent to processing tomatoes showed higher numbers of natural enemies such as lady beetles (aka lady bugs) and fewer crop pests compared with conventionally managed field crops edged with residual weeds.
Benefits from Hedgerows Extend into Field
The researchers discovered that the increase in natural enemy activity in the hedgerows extended 600 feet into adjacent tomato crops and resulted in a reduction of aphid pests and an increase in stink bug egg predation by parasitoid wasps. Tomato fields adjacent to a hedgerow required fewer pesticide treatments than the tomato fields without hedgerows.
This report appears in the November 2015 issue of Acres U.S.A.