-20- 
(77) 
Methyl bromide— —its expectancy as a fumigant. Jour. Scon. Ent. 
31: 70-79. 1938. 
Methyl bromide is toxic to a large group of insects and other 
animals. 1/iany plants in the active or dormant stage can accommodate 
themselves to its vapors at concentrations and exposure periods 
which are lethal to animals. The vapors are noninflammable and 
stable at temperatures, pressures, and moisture conditions met in 
practice. Lack of a distinctive odor at toxic vapor concentrations 
pre sents a hazard tc humans whic h will necessitate t he use of a 
warning compound (lachryna ting g asy. The equipment necessary in 
using this fumigant presents no great mechanical difficulty. 
(78) 
Entomological service, Calif. Dept. Agr. (Ann.. Rpt. 1938) Bui. 
27: 645-668. 1939. 
As the second generation of C arpocapsa pomonella (L.) hatched 
at the time of the first picking of pears, newly hatched larvae, 
which were difficult to detect at the time of picking, were 
numerous in the fruit. .Fumigation of the packed and wrapped fruit 
in the trucks ready for shipment with 2 pounds of methyl bromide 
per 1,000 cubic feet was found to destroy all larvae in 2 to 5 
hours. 
(79) 
Modern fumigation for pest control. Pests 7 (4): 6-8. 1939. 
The amount and type of material fumigated' greatly affect the 
concentration of gas in the air. Hydrocyanic acid gas and ethyl- 
ene oxide, being water-soluble, are greatly affected by moisture, 
whereas carbon disulfide, methyl bromide, carbon tetrachloride, 
and ethylene dichloride, being fat-soluble, are. less affected. In 
vacuum fumigation holding the vacuum throughout the exposure is 
more effective than dissipating the vacuum as soon as the fumigant 
is introduced. The control of termites by fumigant s is worth fur- 
ther investigation. The author is testing tri- and tctra-chloro- 
ethylcnc and methyl bromide. 
— and CARTER, W. B. (80) 
Methyl bromide as a fumigant. A preliminary report. Calif. Dept. 
Agr., Bui. 26: 153-162.' 1937. 
This fumigant possosscs certain properties which permit its 
use against a number of forms of insect' life not possible hitherto 
because of injury to the host. Data relative to its toxicity to 
human subjects are inconclusive. The gas has about the same insec- 
ticidal value as ethylene oxide. Methyl bromide was used at the 
rate of 2.5 pounds per 1,000 cubic feet for 90 minutes in the fumi- 
gation of potatoes for Gno r i mo s bhema ope rculella (Zell.) with 100 
percent kill. In one season 220 cars of potatoes were fumigated 
without injury to vegetables or to personnel. The tomato pinworm 
is easily destroyed by the same dosage. Preliminary tests on 
citrus trees showed complete control, without injury to the tree, 
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