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Show High Murder Record Is Claimed For New Water Weed Killer The Bureau of Reclamation has just reloiisod Information regarding a new killer for water wa-ter weeds, reports James R. Barker, Bar-ker, Utah State Extension Entomologist. En-tomologist. This new material Is claimed to be cheaper (18 to 112 cents per gallon) and more effective than many chlorinated hydrocarbons formerly used. The new material is coal-tar Naptha mixed with five percent of mahogany soap. This mater ial should be readily obtainable. Salt Luke has, lnf uct, promisx-d to have plenty of the new killer available by the time moss becomes be-comes a menace to canals, Mr. barker said. Here Is a description of the new material: "Field trials so far have indicated indi-cated that 185 parts of the chemical chem-ical to one million parts of water wa-ter gives satisfactory control when this concentration Is maintained main-tained over a period of one hour In contact with the water weeds. To obtain 185 parts pei million parts of water for an hour, 5 gallons of the chemical formulation must be applied to each cubllc foot per second of flow over a period of one hour." If the canal is carrying 12 cubic feet per second, it will require re-quire GO gallons applied over a period of one hour or at the rate of one gallon of the mixture per minute, the extension irrlga-tionlst irrlga-tionlst explained. Inasmuch as the amount of chemical necessary neces-sary to control weeds is directly proportioned to the water In the canal, It is economical to reduce the flow at the time of the treatment, he advised. However, It will be necessary to have all the water weeds completely covered. Two very important precautions precau-tions are given in the article: First, the new formula must be handled with caution because it Is highly Inflamable and because be-cause the fumes should not be Inhaled. Second, until more experimental experimen-tal work is done, the Bureau recommends that the water bc-wasted bc-wasted after treatment instead of applying It to crops. Tl -have found no injurious effects so far but say that more expen mental work needs to be done before a definite statement is made about injury to crops. For an emulsifying agent the use of mahogany soap of ap- i eimalely five per cent by volume is recommended and should be thoroughly mixed prior to application. |