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SOME FOREIGN PLANT DISEASES MENTIONED IN FOREIGN PLANT QUARANTINES, 
REGULATIONS, ET AL. 
Prepared by N. Rex Hunt 
Seo. 1. DISEASES MENTIONED IN CURRENT QUARANTINES. 
Eleven of our foreign plant quarantines as well as the 
potato regulations are based in -wrtiole or in part on plant diseases. 
All but four of these mention one or more specific diseases. The 
diseases mentioned are thirteen in number, the pathogens being as 
follows: 
Bacterium citri (quarantines 19 and 28) 
CeratosTCTael'la ulmj (quarantine 70) 
Entyloma oryzae (quarantine 55) 
( Graph iuia ulmi , a stage of Cerates tomella ulmi ) 
Melanom ma glumarum (quarantine 35) 
Oospora oryztorum (quarantine 55) 
( Peronospora maydis , now Sclerospora maydis ) 
Physoderma maydis (quarantine 214.) 
Physoderma zeae -maydis (quarantine 2k.) 
( Sclerospora macrocarpa is an error for S. macrospora ) 
Sclerospora macrospora (quarantine 55) 
Sclerospora maydis (quarantine 2I4.) 
Sclerospora sacchari (quarantine 2l\.) 
Synchytrium endobioticum (potato regulations) 
Urocystis tritici (quarantine 59) 
Ustilago shiraiana (quarantine 3U) 
Of the thirteen diseases mentioned seven occur, or have 
occurred, in the United States, viz.. Bacterium citri . Cerates tomella 
ulmi , Entyloma oryzae , Physoderma zeae -maydis , Sclerospora macrospora , 
Synchytrium endobioticum , and Urocysti^s tritici . 
Only three quarantines (Nos. 28, 59* and 70) are expressly 
based on the disease mentioned without any wording to include other 
diseases. Quarantine No. I5 covers certain injurious insects and 
"fungous diseases"; No. 19, "other diseases"; No. 2^. covers "certain 
injurious diseases," especially those named; No, 3U1 "plant diseases"; 
No. 37» "fungous diseases"; No. Ul* "plant diseases"; No. 55» 
"injurious fungous diseases"; No. 69, "plant diseases"; and the 
potato regulations, "other injurious potato diseases." The wording 
used in some of these quarantines is not sufficiently general to 
cover bacteria, viruses, or nematodes, as you may have noted. 
