THE MONTHLY BULLETIN 



CALIFORNIA STATE COMMISSION OF HORTICULTURE. 



DEVOTED TO HORTICULTURE IN ITS BROADEST SENSE, WITH SPECIAL 

 REFERENCE TO PLANT DISEASES, INSECT PESTS, AND 



THEIR CONTROL. 



Sent free to all citizens of the State of California. Offered in exchange for bulletins 

 of the Federal Government and experiment stations, entomological and mycological 

 journals, agricultural and horticultural papers, botanical and other publications of a 

 similar nature. 



G. H. Hecke, State Commissioner of Horticulture Censor 



E. J. VosLERj Secretary State Commission of Horticulture Editor 



ASSOCIATE EDITORS. 



Geo. p. Weldon Chief Deputy Commissioner 



Harry S. Smith Superintendent State Insectary 



Frederick Maskew Chief Deputy Quarantine Officer 



Entered as second class matter December 29, 1911, at the post office at Sacramento, 

 California, under the act of June 6, 1900. 



New Citrus Quarantine. — Quarantine Order No. 28, which became 

 effective on September 21st, gives the California citrus growers the 

 be.st possible protection against the dread canker disease which at pres- 

 ent occurs in Louisiana, Mississippi, Alabama, Florida, Texas and 

 Georgia. An absolute quarantine against the importation of all citrus 

 fruits and citrus trees, including buds and scions, from any state or 

 territory of the Union is now maintained under this order. While 

 these provisions may seem somewhat drastic to those who are not in 

 close touch with the situation, they could not be made any less drastic 

 and give to our greatest fruit industry the protection which it should 

 have. Before the passage of the order, Florida was the only state 

 which could not send either citrus trees or citrus fruits into California. 

 Now not only Florida and other states where citrus canker is known 

 to exist, but all other states and territories of the Union, must not ship 

 into this state. It was considered necessary to include all states and 

 territories, not because citrus trees or fruits are grown in them, but 

 because of the possibility of fruit being shipped from one state to 

 another and then reshipped to California. Now that every avenue is 

 closed California citrus growers should feel reasonably safe as far as 

 citrus canker is concerned, and it is hoped that this action will result 

 in absolute protection. — G. P. "W. 



QUARANTINE ORDER NO. 28. 



September 21, 1916. 

 Canker of Citrus Fruits and Citrus Trees 



The fact has been determined by the State Commissioner of Horti- 

 culture that a contagious disease, in^iurious to citrus fruits and citrus 

 trees, known as Citrus Canker {Psendomonas citri), new to and not 

 heretofore prevalent or distributed in the state of California, exists in 

 several states of the United States, and that the nature of this disease 



