Show diseased plants barred by the united states importation of plants and plant products Is by fur far the most important moms means of introducing plant diseases into new regions or countries says baye the united states department of agriculture diseases may be spread over short distances by insects wind or other agents but when they are spread over long ion distances tt ft Is usually the result of transporting some part pari of the host plant such as fruit heeds bulbs bubs tubers straw etc fur for tills this rew reni stin the cargo of every vessel vessel arriving nt at a united states port pori from a foreign country la Is carefully inspected to see that plants or fruits imported with dangerous diseases are arc not brought in |