| Show never ending search for safe insecticides largely through the research of the department of agriculture many improvements in insecticides and fu mcgants have been perfected the welfare of the american apple industry Is dependent in considerable measure upon lead arsenate senate nr more than pounds being used annually calcium arsenate has proved to be the most effective insecticide sect icide in checking the cotton boll weevil new fumi fumigants gants have been developed by the department tor for eradicating insects in stored grain which avoid the fire hazard connected with the use of carbon disulphide dr henry 0 knight calef ot of the bureau of chemistry and soils explains that one of the serious problems connected with the general use of insecticides I 1 Is the possible effect of their residues upon human health restrictions as i to the arsenic con content je is J I 1 in n pro products ducts for both domestic use and for export have been met by improved methods of washing fruit but these methods add to costs and may cause storage losses department experts constantly are experimenting to develop more effective insecticides that are harmless to man |
