From VOA Learning English, this is the Agriculture Report.Insects and diseases that attack food crops are moving as risen temperatures bring changes to the environment.Plant diseases alone destroy an estimated 10 to 16 percent of the world's crops in the field, experts say, plant diseases destroy another 6 to 12 percent after harvest.A new study examines the movement of crop pests and diseases,and how it will effect agricultural production worldwide.Dan Bebber is a senior research fellow at the University of Exeter in Britain.He says research has shown that wild plants and animals are moving toward Earth's North and South poles as the planet warms.Mr Bebber wanted to know if the samething was happening with organisms that attack agricultural crops.He examined reports of first sightings of new insects and diseases around the world.The records came from CABI - the Centre for Agricultural Bioscience International.He says the group began collecting information from developing and industrialized countries years ago.