12 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE, 1934 
in the vicinity of the treated blocks, all trapping in the poisoned sections gave 
negative results. 
Sections in which 8 beetles were caught in Detroit, Mich., in 1932 were treated 
with lead arsenate in September of that year. During 1933, 1,000 traps dis- 
tributed throughout Detroit caught 4 beetles, none of which were trapped in 
the treated areas. Three of the specimens were caught in the vicinity of the 
Michigan Central Railroad. A single beetle was found in a city park approxi- 
mately 4 miles distant from other findings. Trap activities in Detroit were sup- 
plemented by the city's spraying sections in which infestations had previously 
been found. The spraying operations began on July 25. A total of 535 trees 
and a large number of shrubs were covered with the spray. A quarter of a ton 
of coated arsenate of lead was applied to the two sprayed sections of the city. 
There was no carry-over from the infestation of two beetles trapped in Florence, 
S. C, in 1932, and treated in the fall of that year with lead arsenate furnished 
by the State of South Carolina. Although a single beetle was trapped in 1933 
in Florence, it was taken at a considerable distance from the previous year's find. 
Excellent control has been obtained at established infestations in Erie, Pa., 
where intensive eradication measures have been practiced during the past 2 years. 
During 1931, 170 beetles were collected in 4 adjacent city blocks in the residential 
section near the city park. In the fall of 1931, 32 acres in and surrounding the 
infested premises were treated with arsenate of lead at the rate of 500 pounds 
per acre. This dosage did not give satisfactory control, for in 1932, 270 beetles 
were trapped in this treated area. Twelve beetles were also caught outside the 
poisoned section. The 1932 trap work was supplemented by repeated appli- 
cations of an attractive poisonous spray to all foliage in the infested sections. 
Following the disappearance of the adult beetle in 1932, additional applications 
of lead arsenate were made to the original centers of infestation, to other adjacent 
small infestations, and to two infestations of a few beetles each at some distance 
from the sections previously treated. The 1932 treatments involved the appli- 
cation of 11.2 tons of soil insecticide to 40.6 acres. Yards that appeared to be 
centers of infestation were treated at the rate of 750 pounds per acre in addition 
to the previous application of 500 pounds per acre. The remainder of the treated 
sections was dosed at the rate of 500 pounds of poison per acre. Three premises 
and adjacent properties, near the original infestation, on which single beetles 
were trapped in 1932, received treatment at the rate of 1,000 pounds per acre. 
This rate was also used in treating an isolated infestation of 5 beetles. Early 
in July 1933 coated arsenate of lead was sprayed on the foliage in 34 residential 
blocks in which beetles were trapped in 1932. Small cages from which attractive 
liquid bait was vaporized were hung in the principal sprayed host plants to 
attract the beetles and to induce feeding on the poisoned foliage. During the 
summer of 1933, 1,282 traps were concentrated in Erie, with the result that 167 
beetles were caught. Only 10 of these were trapped, in sections where the soil 
had previously been treated with lead arsenate. Only a single beetle was caught 
in a yard where 151 beetles were trapped in 1932. In the most heavily infested 
block, the catch was reduced from 200 beetles to 6. Traps in the latter area 
were baited with both bran and liquid bait to ensure the catch of all beetles 
present. As new infestations were disclosed, soil treatments with lead arsenate 
were made at the rate of 1,000 pounds per acre. The 1933 soil treatments covered 
an area of 55 acres. 
REGULATORY CHANGES 
Subsequent to a public hearing held on October 24, 1933, for a discussion of 
the advisability of extending the quarantine to include the States of Maine and 
West Virginia, parts of these two States were brought under restriction, and 
boundaries of the regulated zones in Maryland, New York, and Virginia were 
slightly modified. In Maine the section placed under regulation includes suffi- 
cient territory to make a continuous area from the New Hampshire line to and 
including the city of Portland. Waterville, Maine, was included as a detached 
regulated zone. Along with the addition to the restricted zone of the town of 
Keyser, W. Va., sufficient Maryland territory was added to form a continuous 
strip from the previously regulated zone in the Cumberland, Md., district to the 
West Virginia line adjacent to Keyser. One West Virginia district south of 
Cumberland also was added to facilitate quarantine enforcement. In Maryland 
several sections were added to bring under regulation a number of infestations 
in localities suburban to the District of Columbia. An additional magisterial 
district in Henrico County, Va., was added for the purpose of including an 
infested nursery in that subdivision. The remainder of Norfolk County, Va., 
