1. Materials that are toxic to bees which should not be used if there 

 is a possibility of bee poisoning at the time of treatment or with- 

 in several days thereafter: 



BHC dieldrin lindane 



calcium arsenate Guthion parathion 



Diazinon lead arsenate carbaryl (Sevin) 



2. Materials that are highly toxic to bees but which may be used if 

 certain precautions, involving proper method and timing of applica- 

 tion, recommended dosages and avoidance of high temperatures, are 

 followed: 



malathion Phosdrin TEPP 



3. Materials that are only moderately toxic to bees which may be used if 

 dosage and timing are correct. Should not be applied directly on bees 

 in the field or on the colonies: 



chlorobenzilate endrin endosulfan (Thiodan) 



TDE (DDD) ethion carbophenothion 



DDT tetradifon (Tedion) (Trithion) 



4. Materials that are relatively non-toxic but deliberate spraying of 

 bees even with these materials should be avoided. 



captan Karathane demeton (Systox) 



dodine (Cyprex) methoxychlor thiram 



dioxathion (Delnav) chlorobenzide (Mitox) 2,4-D 



ferbam ovex 2,4,5-T 



Genite sulfur 



What Is Being Done to Reduce Danger of Poisoning? 



1, Research on comparative toxicities of pesticides to bees. This pro- 

 vides information of value in making recommendations for the use of 

 such materials, 



2, Investigations on possible use of substances repellent to bees. These 

 would be included in sprays in order to cause bees to avoid treated 

 surfaces, 



3, Extension specialists recognize danger of poisoning and recommend 

 measures to minimize poisoning. Among these might be (1) proper 

 timing to avoid pesticide applications to plants attractive to bees 

 while in bloom, (2) applications in early morning or in evening 

 when fewer bees will come in direct contact with poison, and (3) 

 avoidance of contamination of area where spraying or dusting equip- 

 ment is being filled, particularly if there is standing water in 

 vicinity by bees. 



