BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 
31 
bility in the handling of seasonal and local problems through the 
issuance of administrative instructions by the Chief of the Bureau. 
Only small additions wore made to the regulated area, and the heavily 
infested area remains the same except for the inclusion of the town 
ship of West Leesport, Berks County, Pa. 
HIGHWAY INSPECTION SERVICE 
The road-patrol work for 1943 continued on the same basis as in 
the previous year, the inspection being confined to examination of 
motor trucks. By July 6 eight road stations were set up. One of 
these operated until July 24. and the remainder until the firsl week 
in September. Thirty inspectors were assigned to this work. During 
the season 94,748 trucks were inspected. Of these, 703 a\ ere found to be 
transporting uncertified produce, but 504 lots of produce were certi- 
fied at inspection centers located near the highway stations. 1 nspeel ors 
at the road stations examined and certified 143 shipments and issued 
permits for the movement of 55 truckloads to isolated regulated areas. 
Only one violation of the regulations was recorded during the season. 
Inspectors intercepted 596 southbound empty trucks, from which 3,823 
live Japanese beetles were removed. An additional 46 beetles were 
taken from the small lots of farm products examined at the -tat ion-. 
CERTIFICATION AND TREATMENT OF NURSERY STOCK 
Nurseries entitled to a noninfested status under modified regulations 
numbered 669 at the end of the fiscal year. The classification system 
previously used was discontinued owing to the revision of the regu- 
lations. Authorization of new methods of chemical treatments thai 
may be utilized for plants with soil about the roots lias removed the 
necessity for screening greenhouses or treating potting soil or field 
plots. 
New administrative instructions to inspectors on treatments used 
as a basis of certification under the Japanese beetle quarantine, issued 
on September 10. 1943, provide the freest possible use of the various 
treatments and utilization of new facts as they are developed. 
Use of the ethylene dichloride dip increased in popularity from 
month to month. A total of 708,515 plants were treated in this man 
ner during the year. Many small nurseries adopted this treatment as 
a means of qualifying their plants for certification. These establish 
ments had previously refused orders going outside the regulated area 
because of the labor and expense entailed in existing methods of cer- 
tification. The dip treatment is cheap and easy, and its use permits 
acceptance of all outside orders, no matter how small. The tempera- 
ture requirement for the dip has been brought down to 35° F. By tlii- 
method a carload of 152 Taxus plants with 21- to 24-inch soil balls 
was dip-treated by 5 men in less than 4 hours. The soil balls absorbed 
370 gallons of the emulsion. By placing his tank of emulsion in a box 
car another nurseryman was able to dip his stock as it was being loaded. 
For the information of nurserymen and greenhonsemen a list of 
plants treated commercially with ethylene dichloride during October, 
November, and December was distributed on December 30, 1943. 
In cooperation with the Division of Fruit Insect Investigation-, 
tests were made of the ethylene dichloride dip treatment of nursery 
stock with soil balls up to 30 inches in diameter. 
