28 BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
Arisaema tortuosum Schott. Himalayan region. 
Greshoff (31 , p. 157) reports that the roots are used as an insecti- 
cide. 
Aristolochla cornuta Mast., A. brasiliensis Mart., and A. elegans Mast. 
Akistolochiaceae. Brazil. 
(Jroshoff (SI, p. 131) reports that the insects visiting these three 
species are killed. 
Artemisia absinthium L. Asteraceae. Synonym: Absintlihnn ruUjare Lam. 
Common wormwood. North Africa and Europe; thoroughly established 
and common in eastern Canada and northern New England. 
Von Mueller (91, p. 55) says that it is " recommended for culti- 
vation as a preventive of various insect -plagues, even phylloxera." 
Schreiber (81) and Goriainov (29) determined that various dilu- 
tions of extracts had only a slight effect on the insects tested. 
Cook and Hutchison (18, p. 4) found that the powdered leaves had 
no effect on fly larvae. 
Artemisia tridentata Nutt. Sagebrush. Western North America. 
The writers' results are given on page 21. 
Asclepias curassavica L. Asclepiadaceae. Bloodflower. Tropical America. 
Manning (56) reports that the Indians of southern Mexico sweep 
the floors and walls of their huts with this and find that they are not 
troubled with fleas for some time afterwards, and Bergey (10), quot- 
ing McDougall, makes similar statements and reports that the odor 
of this milkweed when thus used has been found to check the spread 
of fleas in houses. 
Asclepias tuberosa L. Asclepiadaceae. Butterflyweed. Eastern North 
America. 
Cook and Hutchison (18, p. 4) found that an infusion of the roots 
had a considerable effect on fly larvae, but it was not efficient. 
Asimina sp. Annonaceae. Papaw. 
Howard (44, p. 24) reports that papaw trees have been planted to 
serve as a mosquito repellent, but they are of no value. 
Aster linosyris Bernh. and A. tripolium L. Asteraceae. Europe. 
Passerini (66) found the heads of these species inactive against 
flies. 
Atropa belladonna L. Solanaceae. Belladonna. Southern Europe and Cen- 
tral Asia. 
Riley (71, p. 184) found that an alcoholic extract and a decoction 
of the leaves bad no effect on cotton caterpillars. 
The writers' results are given on page 21. 
Azolla sp. Salviniaceae. 
Howard ( i' h p. 26, 27) and Smith (87, p. 437) report that certain 
water plants, sue]) as Azolla. Lemna, and i( Phu-lo," have been grown 
in water where mosquitoes breed, and it has been ascertained that 
these cljeck the breeding of the mosquitoes to a limited degree by 
preventing the larvae from getting air. 
