February, ’24] 
worthley: corn borer quarantine 
151 
certification of entire fields, the following procedure was adopted: 
Where, after inspection, fields were found free from infestation, certifi¬ 
cates were issued permitting the movement of products outside the area. 
This method worked very well until the middle of the summer of 1920, 
at which time celery in the New England area became ready for the 
market; it then was found that certification of fields of celery was not 
practicable, owing to the method used for bleaching the plants, which 
concealed them to such an extent that inspection could not be made. 
Washroom inspection of the crop, after being taken from the field, was 
then adopted. This rendered the operation of the quarantine there very 
expensive, as very large quantities of celery were grown in the Boston 
area. The field inspection method was continued with respect to other 
products during the summer of 1921, but infestation developed so general¬ 
ly in beets packed with stems and leaves attached, that field inspection 
became impracticable and consequently the washroom inspection method 
was adopted. This change added appreciably to the expense of quaran¬ 
tine operations. 
In the infested areas in New York and Pennsylvania it was found 
practicable to certify quarantined products in the field, because there was 
but one generation per annum in these areas. During the summer of 
1921, scouting work conducted in Ohio and Michigan resulted in 
finding a light infestation bordering Lake Erie in both States. During 
the period from the initiation of the quarantine regulations in the areas 
outside of New England to the fall of 1921, no borers had been found 
in any of the quarantined products, other than corn, and as a logical 
result, Quarantine No. 43 was amended November 15, 1921, to include 
only corn and broom corn, sudan grass and all sorghums, in the States 
of New York, Pennsylvania, Ohio and Michigan, thus eliminating a 
large amount of unnecessary inspection work. 
Upon careful investigation, it was found that the native products 
under quarantine in New England were practically all consumed by 
January first of each year, and that the corn borer was not active in 
products other than corn and flowers until June first following. With 
these facts jn view, Quarantine No. 43 was amended to provide for the 
free movement of all vegetables under quarantine, not including corn 
or cut flowers and plants, from January first to May thirty-first of each 
year. 
As the infested area in New England increased in size, it became ap- 
„ parent that large quantities of the products certified in the field and 
washroom were not being shipped outside of the quarantined area. It 
