JEFFERSON CITY, Mo. -- State officials want to keep a disease that is devastating black walnuts in the west from spreading to Missouri.
That's why the Missouri Department of Agriculture has issued a black walnut quarantine.
The department said the disease could cost the state more than $850 million in losses over a 29-year period.
Under the ban, Missouri is barring all walnut nursery stock, budwood, scionwood, green lumber, firewood and other living or dead plant material from nine states. Those states are Washington, Oregon, California, Idaho, Utah, Arizona, New Mexico, Nevada and Colorado.
Exceptions to the quarantine include things like nuts and some lumber.