Droughts have a similar effect: When soil dries out over long periods, it can become compacted or even crusted over, reducing its ability to absorb water. Severe to extreme preexisting drought ...

The U.S. has closed its southern border again to livestock imports, saying that a flesh-eating parasite has moved further north in Mexico than previously reported.

New cases of screwworms on July 8 in Veracruz, Mexico has caused the U.S. to close southern borders to livestock imports.