PLANTS — INSECTICIDAL PROPERTIES. 45 



Nicotiana glauca Graham. Solanaceae. Tree tobacco. South America, in. 

 troduced in western United States. 



Sprenger (88) recommends three species (glauca, rustica, and taba ■> 

 cum) of tobacco as insecticides. 

 The writers' results are given on page 23. 



Nicotiana rustica L. Aztec tobacco. Eastern United States. 



Goriainov (29) states that a decoction was an effective stomach 

 poison against Malacosoma neustria. 



Nicotiana tabacum L. Common tobacco. South America, now widely culti- 

 vated. 



The writers' results are given on page 8. 



Pachyrhizus tuberosus (Lamb.) Spreng. Fabaceae. West Indies. 



Greshoff (31, p. 57), quoting Ernst, says: "The seeds (in decoc- 

 tion or in form of powder) are used in Merida (Venezuela) for 

 killing vermin." He reports that the tubers and beans contain a 

 poisonous resin which is an active fish poison. 



Pangium edule Reinw. Bixaceae. Java. 



The writers' results are given on page 23. 



Petunia sp. Solanaceae. 



Sprenger (88) recommends a decoction of petunia as an in- 

 secticide. 



Philadelphus coronarius L. Hydra ngeaceae. Sweet mockorange. Europe, 

 cultivated in the United States. 



Riley (71, p. 186) states that an infusion, decoction, and an alco- 

 holic extract had no effect on cotton caterpillars. 



Physalodes peruvianum (Mill.) Kuntze. Solanaceae. Synonyms: P. physa- 

 lodes Britton, Atropa physalodes L., Nicandra physalodes Pers. Peruvian 

 groundcherry. Peru, cultivated and adventive in the United States. 



Pammel (64, p- 131) reports it " used as a fly poison in parts of the 

 United States." 



Phytolacca americana L. Phytolaccaceae. Synonym : P. decandra L. Com- 

 mon pokeberry. Ontario and eastern United States. 



Glover (34, p. 133) reports that the root in either a fresh or dried 

 state is poisonous to cockroaches. 



One of Riley's (71, p. 187) assistants reports that a decoction of 

 the leaves and berries and an alcoholic extract from the dried roots 

 had no effect on cotton caterpillars ; but another one of his assistants 

 says that a very strong decoction "had a decided effect, killing the 

 young worms and seriously affecting the older ones." 



Cook and Hutchison (18, p. 4) found that the powdered root had 

 no effect on fly larvae. 



Picrasma quassioides (Ham.) Bennett. Simarubaceae. Synonyms: P. ailan- 

 thoides Planch., Nima quassioides Ham. Northern India. 



Greshoff (31, p. 30), quoting Batchelor, says that a decoction of 

 the bark is used to kill lice. 



Lyons (S3, p. 356) says that this species possesses insecticidal 

 properties. 



