Inspection of propagative plant material followed by certification that it is free of disease is an effective means of preventing movement of disease organisms from one area to another. Inspection of plant material is carried out by federal and state agencies. The federal government has the responsibility of preventing diseased plant material from entering the United States. This is accomplished by preventing agricultural commodities from crossing the border. The Texas Department of Agriculture is responsible for certification of seed, vegetatively propagated material and nursery stock. A copy of the Texas Seed Certification Standards (which includes vegetatively propagated material) is available from the Texas Department of Agriculture, P.O. Box 12847, Austin, Texas 78711.