﻿16 
  

  

  CIRCULAR 
  2 
  7 
  0, 
  U. 
  S. 
  DEPARTMENT 
  OF 
  AGRICULTURE 
  

  

  fore 
  the 
  tips 
  of 
  the 
  leaves 
  have 
  life 
  history 
  

  

  begun 
  to 
  separate 
  (fig. 
  IT). 
  If 
  

  

  neither 
  the 
  oil 
  nor 
  the 
  lime-sulfur 
  The 
  apple 
  aphid 
  winters 
  in 
  the 
  

   is 
  used, 
  nicotine 
  sulfate 
  three- 
  ^gg 
  stage, 
  in 
  the 
  same 
  manner 
  as 
  

   fourths 
  pint, 
  with 
  soap 
  2 
  or 
  3 
  the 
  rosy 
  apple 
  aphid, 
  although 
  the 
  

  

  eggs 
  are 
  more 
  likely 
  to 
  be 
  found 
  

  

  r 
  — 
  " 
  ^ 
  on 
  water 
  sprouts 
  than 
  on 
  other 
  

  

  -«-*^«^ 
  parts 
  of 
  the 
  trees. 
  The 
  eggs 
  hatch 
  

  

  ^' 
  at 
  about 
  the 
  same 
  time 
  as 
  do 
  those 
  

  

  of 
  the 
  rosy 
  apple 
  aphid, 
  and 
  there 
  

   may 
  be 
  from 
  9 
  to 
  17 
  generations 
  in 
  

   a 
  year. 
  Young 
  and 
  adults 
  are 
  

   green 
  with 
  black 
  legs, 
  and 
  some 
  

   "'^ 
  have 
  yellowish 
  heacls. 
  Some 
  of 
  

  

  the 
  adults 
  are 
  winged, 
  and 
  these 
  

   t 
  migrate 
  to 
  other 
  apple 
  trees, 
  thus 
  

  

  spreading 
  the 
  infestation 
  during 
  

   the 
  season. 
  The 
  eggs 
  are 
  green 
  

   when 
  deposited 
  in 
  the 
  fall, 
  but 
  

   later 
  become 
  glossy 
  black. 
  

  

  Figure 
  17. 
  — 
  Apple 
  bud 
  at 
  stage 
  of 
  devel- 
  

   opment 
  to 
  spray 
  for 
  aphids. 
  

  

  pounds 
  or 
  casein 
  spreader 
  1 
  

   pound, 
  to 
  100 
  gallons 
  of 
  water 
  at 
  

   this 
  time 
  will 
  give 
  good 
  control. 
  

   Parathion, 
  one-half 
  pound 
  of 
  a 
  

   15-percent 
  wettable 
  powder 
  to 
  100 
  

   gallons 
  of 
  water, 
  is 
  also 
  effective. 
  

  

  Caution. 
  — 
  Extreme 
  caution 
  must 
  be 
  

   used 
  in 
  handling 
  and 
  storing 
  parathion. 
  

   (See 
  p. 
  59 
  for 
  details.) 
  

  

  Apple 
  Aphid 
  

  

  The 
  apple 
  aphid, 
  formerly 
  

   known 
  as 
  the 
  green 
  apple 
  aphicl, 
  

   lives 
  on 
  apple 
  trees 
  throughout 
  the 
  

   year 
  and 
  feeds 
  mostly 
  on 
  the 
  suc- 
  

   culent 
  terminal 
  twigs 
  (fig. 
  18), 
  

   curling 
  the 
  leaves 
  and 
  stunting 
  

   the 
  growing 
  shoots. 
  It 
  is 
  thus 
  in- 
  

   jurious 
  chiefly 
  to 
  nursery 
  stock 
  

   and 
  to 
  young 
  trees, 
  although 
  it 
  

   may 
  become 
  sufficiently 
  numerous 
  

   on 
  bearing 
  trees 
  to 
  hinder 
  normal 
  

   growth. 
  It 
  is 
  occasionally 
  found 
  

   on 
  pear 
  trees. 
  This 
  aphid, 
  which 
  

   came 
  from 
  Europe, 
  is 
  now 
  found 
  

   in 
  the 
  United 
  States 
  wherever 
  

   apples 
  are 
  grown. 
  

  

  Figure 
  18. 
  

  

  -Apple 
  aphids 
  on 
  apple 
  

   foliage. 
  

  

  CONTROL 
  

  

  The 
  control 
  measures 
  recom- 
  

   mended 
  for 
  the 
  rosy 
  apple 
  aphid 
  

   are 
  also 
  effective 
  for 
  this 
  species. 
  

   Since 
  it 
  remains 
  on 
  the 
  trees 
  

   throughout 
  the 
  season 
  and 
  mi- 
  

  

  