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MONTHLY LETTER OF THE BUREAU OF ENTOMOLOGY 
UNITED STATES DEPARTMENT OF AGRICULTURE 
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Number 219 Activities for June July, 1932 
(Not for Publication) 
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JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
Reduced dosage of hydrocyanic acid gas effective for fumigation 
of Japanese beetle in fruit cars.—-J. W, Lipp, Moorestown, N. J., reports 
that “Whree tests have been run with liquid hydrocyanic acid against the 
adult beetle at the rate of 2 ounces per 1,000 cubic feet, at tempera— 
tures of approximately 70°, 75°, ard 80° F. A complete mortality was ob— 
tained with this dosage, the same rate recommended tentatively for re— 
frigerator-car fumigation. On June 28 a test was run at Philadelphia, 
using 6 ounces of liquid hydrocyanic acid in a car approximately 2,400 
cubic feet (including ice bunkers) in volume, which was loaded with bana— 
nas. One thousand beetles were Qistributed throughout the car before 
the hydrocyanic acid was applied. Twenty-four hours later all beetles 
were dead. The temperature inside the car dropped to 60° F. during the 
treatment. The results indicate that the dosage of 6 ounces of hydrocy-— 
anic acid per car for a period of two hours gives a complete mortality 
of the beetles," 
to F. E. Baker, Moorestown, "damage to strawberry plants caused by larval 
feeding was reported to the laboratory. The injury was reported from 
Vineland and Mercerville, N. J. It was first observed when dead and 
wilted plants began to show up in the beds, along with a decreased 
yield of fruit. Upon further examination by digging up several plants, 
it was found that the roots had been injured. Inasmuch as several Jap- 
anese beetle larvae were fourd feeding under the plants, the injury 
was immediately attributed to them. It is planned to test the effect 
of lead arsenate applied to the soil to kill the grubs." 
ee Se A OM | SENET OUT 
beetle grubs.--On June 2 W. E. Fleming and F. E. Baker made an examina— 
tion " of the perennials potted last year in soil containing lead arsen- 
ate at the rate of 1,500 pourds per acre to a depth of 3 inches. This 
exemiration was made only on the appearance of the tops and did not 
take into consideration the condition of the roots. * * * The follow- 
ing varieties of perennials appear to be as good in the treated as in 
the untreated soil: 
Ajuga reptans, Amsonia tabernaemontana, Aster novae-angliae, 
Calimeris incisa, Centaurea cealbata, Centranthus ruber, Chelone glabra 
