626 ANNUAL REPORTS OF DEP.UITMENT OF AGRICULTURE. 



nitoly detormino tjint tho Europoan corn horor originally reached 

 this country through tlic niediuju of such imported broom corn. 

 Tliis quarantine was later amended (July 31, 1920) to include 

 under its j)rovision manufactured brooms and also the provision 

 that the raw broom corn should ])e so selected in the country cf ex- 

 port as to be free from visible evidence of infestation. The neces- 

 sity for including brooms was determined as a result of an examina- 

 tion of a consi(lera])le importation of largo Italian stable brooms. 

 These proved to be stulled with a considerable quantity of the 

 actual stems of broom corn and could thus be a means of conveying 

 the insect equally readily with unmanufactured material. At the 

 present tinic, th^i'oioro, the requirement of disinfection as a condi- 

 tion of entry applies to both the manufactured and raw product. 

 The only disinfection which has proven effective is by steam cook- 

 ing, a process which apparcntl}'- does not injure the value of the 

 broom corn either in the raw state or as manufactured. 



EXTENSION OF JAPANESE BEETLE QUARANTINE. 



The Federal quarantine on account of the Japanese beetle has 

 been twice revised during the year, namely, on April 1 and October 

 1, 1920. The first of these revisions had relation to the inclusion of 

 a slight increase of the invaded territory in New Jersey and a broad- 

 ening of the quarantine to cover, in addition to green or sugar corn, 

 a large list of truck crops and other articles which might act as possi- 

 ble carriers of the pest. 



The second revision of the quarantine (October 1, 1920) was 

 made to take into account a further extension of this insect in New 

 Jereey and also its extension across the river from the New Jersey 

 territory into the border counties of Philadelphia and Bucks, in 

 Pennsylvania. This quarantine is being enforced in cooperation 

 with the Bureau of Entomology of this department and with the 

 States concerned. It provides for the movement of all the articles 

 brought under restriction under inspection and certification. 



THE POTATO WART. 



PRESENT DISTRIBUTION OF THE DISEASE. 



The potato wart disease was last year reported as occurring in two 

 areas in Pennsylvania, one in the eastern and the other in the south- 

 western part of the State, and in an area in West Virginia. The sur- 

 veys of 1920 have extended these areas somewhat and the disease 

 has been determined as occurring in western Maryland. Practically 

 all of these occurrences are in mining regions and probably had a 

 similar origin from foreign potatoes imported in the winter of 1911-12. 



The survey planned for 1920 included a program of intensive search 

 in mining regions in these States and also garden inspect:ions in 

 selected localities in settlements of a foreign character approximating 

 in method of living and garden cultures those obtaining in mining 

 districts. These surveys have been negative other than as to the 

 mining districts in the States named. They were intensively con- 

 ducted at a number of points in New Engl,and in centers of foreign 

 population, and also in New York, New Jersey, Ohio, Michigan, Indi- 

 ana, Illinois and Wisconsin, including coal fields in Indiana and 

 Illinois. 



