Greatly increased interest has been shown recently thruout Iowa in the recognition of weeds which are injurious to the farmer. The county weed demonstrations put on by the extension service of Iowa State College have been very helpful in extending the knowledge of the weeds of the state. It ls very important that new serious weeds be recognized promptly, and timely measures employed to prevent them from becoming a menace to agriculture. Thirty years ago the extermination of quack grass in the state might have been accomplished at the cost of a quarter of a million dollars; today, however, several millions of dollars would not be sufficient to remove the weed •
Pammel, L. H. and King, Charlotte M., "Some New Weeds of Iowa" (1925). Circular. Paper 98.