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In addition to introductions of natural enemies in the wild , biological control is used in agriculture to control weeds . The strategy includes the prevention of intentional and unintentional introductions of invasive alien species to and from other countries , or from species moved across provincial and territorial borders within Canada , or between ecosystems within a region . " TPWD has begun large-scale introductions of a bio-control agent , the salvinia weevil Cyrtobagous salviniae , which feeds on the plants and may have long-term potential . These files contain background information , poems and copies of poems and other works , correspondence , as well as notice of the poets ' lectures and Dr. Lampe 's notes and written introductions of the authors . Initiating training early on is necessary to prepare for the widespread introduction of EVs , but further vehicle standardization is needed to enhance safety and standardize response procedures . With the introduction of MC , the mean and median marks moved from a low 2.1 to a high 2.1 with the introduction of MC testing . This deduction was inadvertently made inoperative with the removal of the inter-corporate dividend rebate within wholly owned companies in connection with the introduction of the consolidated regime applying generally after 30 June 2003 . " Another grave matter , viz ., the introduction of extermination by gas in the Eastern Occupied Territories will be dealt with in detail in its turn . This session could not have taken place without the generous support of these associations and their representatives and warm thanks are due to Alison Calder ( ACQL ) for her excellent introductions of the presenters , Maureen Ranson ( LTAC ) for her help in organizing it and Jo-Anne Elder ( ellipse ) for her closing remarks and , as always , her generosity and enthusiasm . As compared to estate agriculture , smallholder agriculture has always been associated with low productivity , although the customary form of land tenure itself does not appear to have restrained the introduction of improved technology or new methods of production .