JiUglit  bisects  injurimts  in  11)U4. 
281 
B. — Boil  twelve  pounds  of  quassia  chips  and  add  the 
extract  to  a hundred  gallons  of  soft  water  and  six 
or  seven  pounds  of  soft  soap. 
These  washes  should  be  used  liberalh',  as  their  object  is 
to  reach  and  destroy  the  insects.  The  case  is  different  with 
arsenical  compounds  which  are  used  for  poisoning  the  leaves 
on  which  caterpillars  feed  and  which  ought,  therefore,  to  be 
delivered  in  a fine  spray  so  as  to  deposit  the  poison  as  uniformly 
as  possible  on  the  leaves. 
During  the  past  season  a great  many  aphis  attacks  have 
been  complained  of,  and  now  they  will  be  passed  briefly  in 
review,  a few  notes  being  added  in  cases  where  they  seem 
likely  to  be  of  use.  Nearly  all  the  green  flies  of  agricultural 
importance  belong  to  the  group  known  as  Aphidinae.  The 
American  blight  or  woolly  aphis  belongs  to  the  Schizoneurinae, 
while  those  attackiiig  coniferous  trees  are  mostly  of  the  group 
Chermesinae. 
BLIGHT  INSECTS  REPORTED  AS  INJURIOUS  IN  1904. 
APHIDIN^. 
Corn  Aphis  {Siphonojthora  granaria). — On  leaves  and 
stem  of  the  young  i^lants,  and  later  in  the  ears.  Dusting  with 
lime  or  soot  has  been  found  useful,  and  stimulating  manures 
should  be  applied  to  push  on  the  crop. 
Strawberry  Aphis  {Siphonophora  fragarke). — This  is 
an  extremely  rare  pest  not  referred  to  in  any  of  the  books  on 
injurious  insects.  There  are,  however,  previous  instances  of 
its  occurrence  at  long  intervals.  What  becomes  of  it  in  those 
intervals  is  quite  unknown.  It  may  be  normally  present  to 
an  unnoticeable  extent — though  on  the  other  hand  strawberry 
plants  seem  remarkably  free  from  blight  — or  it  perhaps 
maintains  its  existence  on  the  wild  strawberry.  Its  presence 
this  year  is  an  indication  of  the  extremely  favourable  conditions 
for  aphis  attack. 
Pea  Aphis  {Siphonophora  pisi,  Green  dolphin). 
Hop  Aphis  {Phorodon  humuU). — It  is  probable  that  some 
of  the  aphids  winter  on  the  hop  hills,  but  certainly  most 
migrate  in  September  from  the  hops  to  the  sloe  and  to  plum 
trees,  especially  the  damson,  when  the  regular  life-history  is 
continued,  males  and  females  appearing  and  winter  eggs  being 
laid.  These  trees,  therefore,  have  to  be  taken  into  account  in 
dealing  with  the  hop  aphis. 
Cherry  Aphis  {Myzus  cerasi). 
Peach  Aphis  {Myzus  persicce). — Found  also  on  the 
nectarine  and  sometimes  on  the  apple. 
