The U.S. Department of Agriculture also lists the entire island of Puerto Rico as infested. Range of the RIFA in the United States. RIFAs were still on the move in the US in the early 21st century, often traveling from one area to another in turf, root balls of nursery plants, and other agricultural products.
Keep yourself, your loved ones, and your home safe from scorpions with diatomaceous earth. It's a safe product that works through a mechanical reaction, rather than chemical, to kill bugs. When the scorpion comes into contact with the DE, the powder will attach to the exoskeleton of the scorpion and begin to dehydrate.
Chemical Canada Thistle Control. Canada thistle can be killed with either Roundup or 2,4-D weed killers. These weed killers will kill back the leaves on the plant and will kill back some of the root system. The best time to apply these weed killers is on sunny days when the temperatures are between 65 and 85 degrees F. (18-29 C.).