EO. 
J. W. Bulger, Takoma Park, in testing acetone extracts of Cracca 
against mosquito larvae, found the extract of Cracca latidens much 
more toxic than extracts of roots of other species, in arreenent with 
tests of kerosene extracts of the same 9 samples by Campbell .and Sul- 
livan ogainst house flies. 
Further comparative tests by F. L. Campbell ond W. H. Sullivan 
of kerosene extracts of Cracca latidens and Derris elliptica emmha- 
Sized the superiority of the latter against house flies. An extract 
of derris, one fourth pound per gallon, was more effective tnan an 
extract of Cracca at the rate of 2 pouncs per gallon. The rapid lab- 
oratory method now veing used for the testins of these extracts has 
aroused the interest of the household insecticide incustry as a possi- 
ble substitute for the Peet-Grady method, 
EXCHANGE OF USEFUL IiSECTS 
Two s.iipments of material containi:y parasites of the wooly apple 
aphid (Eriosone. laniserun Fausn.) were forvarded to foreign countries 
Sy Novenber. The material was:collected by M. A: Yothers at Wenat— 
chee, Wash., where the parasite Aphelinus mali Held. hes become very 
well established in recent years. One consigmment was sent to Colon 
bia througn the Division of Agricultural Coonerntion of the Pan Ameri- 
can Union. ne second lot was sent to C. E. Ballou, formerly of this 
Bureou, for liberation at San Jose, Costa Rica. 
BEE CULTURS 
Both the Southern States Bee Culture Field Laboratory, Baton Rouge, 
La., in charge of Dr. Warren Whitcomb, Jr., and Division headquarters, 
pomerset, Mc., have Deen consulted almost constantly with respect to 
the marketing agreement for packare bees and queens which the Bee Shin- 
pers! Federation, headquarters at Auburn, Ala., has submitted to the 
Agricultural Adjustment Administration. The Bee Shippners! Federation 
was organized for tue purpose of applying for a marketing esreement, 
and its membership consists of producers of package bees anil queen 
Dreeders of the United States. <A freat many informal conferences have 
been helc in Washington and several conferences have deen held in the 
field by various subsidiary State or;anizations. The Acricultural Ad- 
Justment Administration announced that the formal or public hearing on 
the agreement will be held in New Orleans on December. 14. Tiis meeting 
is expected to be well attended by package producers and queen breed 
ers from all over the country. Representatives from the division head- 
Quarters and from the Baton Rouge laboratory will assist at the hearing. 
