New Zealand arable crop yields can be severely compromised by the presence of a number of native and introduced weeds and pests. Weeds compete with crops for water, light and nutrients, while feeding damage from insect pests can reduce plant growth and vigour, and in some cases, spread diseases. Chemical controls can be effective, but can also be costly, and target-species may, over time, develop resistance to them. Environmental concerns and the costs of registering new agrichemicals are also leading to a reduction in the number and type of agrichemicals available for use on New Zealand farms. FAR's weed and pest research focuses on identifying cost-effective and environmentally sound management packages for a range of weeds and pests of arable crops. It includes projects investigating integrated pest management and the management of agrichemical resistance.