Provision for a national pest survey. Provision for internal plant pest control. Copenhagen, Ejnar Munksgaard, 1954. The Symposium brought into sharp focus the multitude of problems and the difficulties confronting those organizations charged with preventing the introduction of and limiting the spread of pests and diseases of forests and forest products moving in international trade channels. Despite careful inspection at ports of entry, the possibilities of introducing serious pests along with plant material and associated soil are very great.
Clean seed is the safest means of transporting living plant material.
All packing cases are checked and destroyed if insect infestation is suspected. Member countries agreed to establish measures that would ensure closer co-ordination of those measures directed to these ends. The principles adopted in 1951 were directed primarily toward agricultural plants and commodities and have, therefore, not provided adequately for many commodities of interest to forests and forest products protection. The dispersal internationally of destructive organisms of forests may be either natural or artificial. The artificial dispersal agencies, on the other hand, have been responsible for most, if not all, of the instances where wide natural barriers, such as oceans, deserts, and mountain ranges, have been overcome.