28 BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 



Arisaema tortuosum Scliott. Himalayan region. 



Greshoff (31, p. 157) reports that the roots are used as an insecti- 

 cide. 



Aristolochia cornuta Mast., A. brasiliensis Mart., and A. elegans Mast. 

 Akistolochiaceae. Brazil. 



Greshoff (31, p. 131) reports that the insects visiting these three 

 species are killed. 



Artemisia absinthium L. Asteeaceae. Synonym: Absinthium vulgare 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. Bloodfiower. 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. Asteeaceae. 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 had no effect on cotton caterpillars. 

 The writers' results are given on page 21. 



Azolla sp. Salviniaceae. 



Howard (44, P- 25, 27) and Smith (87, p. 437) report that certain 

 water plants, such as Azolla, Lemna, and Phu-lo," have been grown 

 in water where mosquitoes breed, and it has been ascertained that 

 these check the breeding of the mosquitoes to a limited degree by 

 preventing the larvae from getting air. 



