﻿40 
  

  

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

  

  buds 
  begin 
  to 
  show 
  white 
  and 
  just 
  

   after 
  the 
  blooming 
  period. 
  The 
  

   trees 
  should 
  be 
  examined 
  some 
  

   days 
  after 
  the 
  first 
  spray 
  has 
  been 
  

   applied 
  : 
  if 
  there 
  is 
  an 
  average 
  of 
  

   one 
  or 
  more 
  thrips 
  to 
  each 
  bud 
  at 
  

   this 
  time, 
  the 
  later 
  sprays 
  are 
  ad- 
  

   visable. 
  For 
  prune 
  and 
  plum 
  

   trees 
  a 
  spray 
  consisting 
  of 
  1 
  pint 
  

   of 
  an 
  oil 
  emulsion 
  containing 
  25 
  

   percent 
  of 
  DDT. 
  or 
  2 
  pounds 
  of 
  

   50-percent 
  DDT 
  wettable 
  powder, 
  

  

  Figure 
  47. 
  — 
  Larva 
  of 
  the 
  pear 
  thrips. 
  

   Greatly 
  enlarged. 
  

  

  in 
  100 
  gallons 
  of 
  water 
  should 
  be 
  

   used. 
  A 
  dust 
  containing 
  5 
  per- 
  

   cent 
  of 
  DDT 
  with 
  sulfur 
  or 
  inert 
  

   materials 
  may 
  be 
  used 
  instead. 
  

   There 
  is 
  also 
  a 
  possibility 
  that 
  

   thrips 
  can 
  be 
  controlled 
  with 
  in- 
  

   secticides 
  applied 
  to 
  the 
  soil. 
  In- 
  

   formation 
  on 
  this 
  method 
  may 
  be 
  

   obtained 
  from 
  your 
  State 
  Exten- 
  

   sion 
  Service. 
  

  

  Eye-Spotted 
  Bud 
  Moth 
  

  

  The 
  eye-spotted 
  bud 
  moth 
  dam- 
  

   ages 
  prunes 
  and 
  plums 
  in 
  the 
  

   Pacific 
  Northwest, 
  but 
  may 
  be 
  

   found 
  on 
  all 
  the 
  orchard 
  fruits, 
  as 
  

  

  well 
  as 
  on 
  some 
  other 
  plants. 
  It 
  

   is 
  a 
  cool-climate 
  insect, 
  occurring 
  

   chiefl}' 
  in 
  Oregon 
  and 
  Washington 
  

   west 
  of 
  the 
  Cascade 
  Mountains, 
  in 
  

   northern 
  Idaho, 
  and 
  in 
  British 
  

   Columbia. 
  It 
  is 
  also 
  a 
  pest 
  in 
  the 
  

   Eastern 
  States, 
  in 
  Canada, 
  and 
  in 
  

   Europe, 
  which 
  was 
  its 
  original 
  

   home. 
  It 
  causes 
  the 
  most 
  injury 
  

   to 
  the 
  expanding 
  buds, 
  which 
  are 
  

   devoured 
  by 
  the 
  partly 
  grown, 
  

   hungry 
  caterpillars 
  that 
  have 
  

   hibernated 
  on 
  the 
  trees. 
  Crops 
  

   are 
  reduced 
  by 
  this 
  bud-feeding 
  

   habit, 
  and 
  injury 
  to 
  the 
  terminal 
  

   shoots 
  causes 
  a 
  bushy 
  growth 
  (fig. 
  

   48 
  ) 
  . 
  Later 
  the 
  insects 
  eat 
  the 
  f 
  oli- 
  

  

  I 
  jff 
  

  

  Figure 
  48, 
  — 
  Bushy 
  terminal 
  growth 
  of 
  

   prune 
  caused 
  by 
  injury 
  by 
  bud 
  moth. 
  

  

  age, 
  and 
  a 
  new 
  generation 
  feeds 
  

   on 
  fruit, 
  often 
  attaching 
  a 
  leaf 
  to 
  

   it 
  and 
  feeding 
  in 
  the 
  shelter 
  thus 
  

   formed. 
  

  

  LIFE 
  HISTORY 
  AND 
  HABITS 
  

  

  The 
  partly 
  grown 
  dark-brown 
  

   larvae 
  of 
  the 
  bud 
  moth 
  winter 
  in 
  

   small 
  silken 
  nests, 
  or 
  hibernacula, 
  

  

  