32  Plants  Used  as  Insecticides.       {Ajanu0ary  ^J?™' 
them.  I  have  noticed  that  they  will  not  remain  upon  the  plants. 
(Porcher.) 
Caladium  bicolor  Vent.  Aracece. 
The  powdered  leaves  are  used  as  an  insecticide.  (Greshoff.) 
Callilepis  Laureola  DC.  Conipositce. 
The  powdered  root  is  used  as  an  insecticide  in  Natal.  (Gres- 
hoff, 1913.) 
Cannabis  sativa  L.    Cannabinaceoe.    Hemp.    Asia,  cult,  in  U.  S. 
The  hemp-plant  serves  as  a  protection  against  insects  on  culti- 
vated fields,  if  sown  along  their  boundaries,    (von  Mueller.) 
Capsicum  sp.  L.   Solanacece.    South  America ;  widely  cultivated. 
Undiluted  capsicum  killed  cotton  worms  (Aletia)  on  contact 
after  twelve  hours.  (Riley.) 
Carapa   guianensis   Aubl.     Meliacece.     Synonym :  Xylocarpus 
Carapa  Spreng.   Andiroba  or  Carapa  Tree.  Guiana. 
Decoction  used  as  an  insecticide.    (T.  Peckolt,  1901  ;  quoted  by 
Greshoff,  191 3.) 
Cassia  occidentalis  L.     Ccesalpiniacecc.     Coffee  Weed ;  Coffee 
Senna.    Widely  diffused  in  tropical  countries. 
Alcoholic  extract  and  decoction.  This  has  undoubtedly  some 
effect  on  the  worms  {Aletia)  though  much  less  than  the  China  tree 
berries.  Appears  to  act  upon  contact,  though  very  slowly.  The 
worms  appear  to  get  affected  several  hours  after  application,  rest- 
ing motionless  and  without  feeding,  but  were  recovered  on  the  sec- 
ond day.  Some  young  worms  were  found  dead  one  day  after  appli- 
cation, but  it  is  doubtful  whether  from  the  effect  of  the  decoction  or 
killed  by  the  force  of  the  spray.  (Riley.) 
Cassia  stipulacea  Ait.  Ccesalpiniacece. 
The  leaves  are  used  as  an  insecticide.  (Greshoff.) 
Ceratotheca  integribracteata  Engl.  Pedaliacece. 
The  decoction  is  used  in  West  Africa  as  an  insecticide.  (Gres- 
hoff, 1913.) 
Chenopodium  ambrosioides  L.  Chenopodiacecc.  Synonyms  :  Am- 
brina  anthelmintic  a  Spach.,  Orthosporum  anthelminticum  R. 
Br.,  C.  ambrosioides  var.  anthelminticum  A.  Gray.  American 
Wormseed.   Europe,  nat.  in  U.  S. 
No  effect  whatever  on  cotton  worms  {Aletia)  was  observed  from 
