{Continued from inside front cover) 



their being mistaken for food or medicine, and they should be stored in 

 a place where children and others unaware of their dangerous character 

 cannot gain access to them. If fully safe storage facilities cannot be 

 provided, the quantities purchased should be only sufficient for the 

 current work, and the storage of these dangerous chemicals thus avoided. 

 More detailed suggestions regarding certain of the materials follow. 



Lead arsenate (p. 70) and calcium arsenate. — These materials are used for the 

 control of the codling moth (pp. 2-8) and other chewing insects. They are very 

 poisonous when taken into the system. When they are applied as dusts, or are 

 being prepared for use as spray mixtures, the breathing of the dry material should 

 be avoided. When prolonged exposures to arsenical dusts cannot be avoided 

 the operator should wear a suitable type of respirator. The hands should be kept 

 away from the mouth and should be well washed before food is handled or eaten. 

 The wearing of oiled leather gloves is helpful. 



Cryolite and other fluorine compounds (p. 71). — These are used for codling moth 

 control (pp. 2-8). The same precautions should be followed as with the arsenicals. 



Nicotine (p. 73). — Nicotine is used as a contact spray for sucking insects (pp. 23, 

 24, etc.), and also to some extent for controlling the codling moth (pp. 2-8). 

 It is a very poisonous material, although individual susceptibility varies greatly. 

 Some persons can apply it freely without suffering any noticeable effects, whereas 

 others may develop acute nausea. Those who experience difficulty of this kind 

 should protect themselves by the use of a respirator of a type which uses pads 

 saturated with acetic or citric acid. Illness can also be caused by the absorption 

 of nicotine through the skin, and operators should avoid the continued wearing 

 of clothing that has become saturated with spray solutions containing nicotine. 



Lime-sulfur (p. 71). — Lime- sulfur is used for the control of the San Jose scale 

 (pp. 9-11) and red spiders and mites (pp. 16-22), and is also used as a fungicide. 

 It is very caustic to the skin, especially when used in high concentrations as when 

 fruit trees are sprayed during their dormant period. Persons exposed to this 

 material should protect their faces by covering them with grease or petroleum 

 jelly before they begin spraying, and should avoid getting any of the material into 

 the eyes, which would cause acute temporary discomfort. Hands may be protected 

 by wearing oiled leather gloves. 



