Invasive species pose a huge global threat, both in terms of biodiversity and the cost to economic activities such as agriculture, trade, tourism and development. Invasive species disproportionately affect communities in poor rural areas; people who depend on natural resources and healthy ecosystems to make a living. For example, invasive insect pests and diseases can significantly affect agricultural productivity and production. An invasive weed can take over agricultural land and outcompete food and feed crops for limited resources. Invasive species can also harm the health of people in infected areas. This can be both direct (allergies, interaction with disease vectors) and indirect (reduced agricultural productivity).