﻿ORCHARD 
  INSECTS 
  PACIFIC 
  NORTHWEST 
  

  

  45 
  

  

  cult 
  to 
  control 
  than 
  those 
  above 
  

   ground. 
  

  

  LIFE 
  HISTORY 
  

  

  The 
  black 
  wingless 
  forms 
  live 
  

   on 
  the 
  roots 
  throughout 
  the 
  year, 
  

   and 
  in 
  the 
  spring 
  some 
  of 
  them 
  mi- 
  

   grate 
  to 
  the 
  new 
  growth 
  above 
  

   ground 
  where 
  they 
  increase 
  rap- 
  

   idly 
  (fig. 
  53). 
  As 
  they 
  become 
  

  

  Figure 
  53. 
  — 
  Black 
  peach 
  aphids 
  on 
  

   peach 
  shoot. 
  

  

  crowded 
  winged 
  forms 
  develop, 
  

   which 
  fly 
  to 
  other 
  trees 
  and 
  estab- 
  

   lish 
  new 
  infestations. 
  The 
  aerial 
  

   forms 
  usually 
  disappear 
  by 
  mid- 
  

   summer. 
  

  

  CONTROL 
  

  

  If 
  the 
  root 
  -feeding 
  form 
  is 
  

   numerous 
  enough 
  to 
  affect 
  the 
  

   growth 
  of 
  the 
  trees, 
  it 
  should 
  be 
  

   controlled 
  with 
  paradichloroben- 
  

   zene, 
  used 
  as 
  recommended 
  for 
  the 
  

   peach 
  tree 
  borer 
  (p. 
  38). 
  The 
  

   aerial 
  form 
  may 
  be 
  controlled 
  

   readily 
  with 
  the 
  usual 
  nicotine 
  

   sprays. 
  

  

  Orchard 
  Mites 
  

  

  Orchard 
  mites, 
  including 
  the 
  

   clover 
  mite, 
  the 
  two-spotted 
  spider 
  

   mite, 
  and 
  the 
  European 
  red 
  mite, 
  

   injure 
  peaches, 
  but 
  are 
  rarely 
  

   found 
  on 
  apricots. 
  The 
  two-spot- 
  

   ted 
  spider 
  mite 
  also 
  attacks 
  hops, 
  

   beans, 
  and 
  many 
  other 
  crops, 
  as 
  

   well 
  as 
  weeds 
  that 
  may 
  be 
  grow- 
  

   ing 
  in 
  the 
  orchards. 
  It 
  is 
  similar 
  

   in 
  appearance 
  to 
  the 
  Pacific 
  mite 
  

   and 
  spins 
  a 
  great 
  deal 
  of 
  webbing. 
  

   For 
  a 
  description 
  of 
  the 
  other 
  

   species, 
  see 
  page 
  10. 
  

  

  CONTROL 
  

  

  Control 
  of 
  the 
  mites 
  on 
  peaches 
  

   is 
  to 
  some 
  extent 
  the 
  same 
  as 
  on 
  

   apples 
  and 
  pears. 
  (See 
  p. 
  12.) 
  

   Dormant-season 
  sprays 
  are 
  effec- 
  

   tive 
  against 
  the 
  clover 
  mite 
  and 
  

   the 
  European 
  red 
  mite, 
  and 
  lime- 
  

   sulfur 
  solution, 
  used 
  before 
  blos- 
  

   soming, 
  is 
  also 
  very 
  effective. 
  For 
  

   summer 
  sprays 
  1 
  gallon 
  of 
  lime- 
  

   sulfur 
  to 
  which 
  is 
  added 
  2 
  or 
  3 
  

   pounds 
  of 
  wettable 
  sulfur, 
  or 
  wet- 
  

   table 
  sulfur 
  alone 
  at 
  4 
  to 
  6 
  pounds, 
  

   to 
  100 
  gallons 
  of 
  water 
  may 
  be 
  

   used. 
  Parathion 
  and 
  rotenone 
  are 
  

   also 
  effective, 
  as 
  on 
  apples 
  and 
  

   pears, 
  but 
  toxaphene 
  should 
  not 
  be 
  

   used 
  on 
  stone 
  fruits 
  as 
  it 
  may 
  

   injure 
  them. 
  (See 
  Caution, 
  p. 
  59.) 
  

  

  Peach 
  Twig 
  Borer 
  

  

  Ripening 
  peaches 
  are 
  sometimes 
  

   wormy, 
  and 
  this 
  worminess 
  may 
  be 
  

   associated 
  with 
  a 
  split 
  pit. 
  The 
  

   brown 
  worms 
  in 
  these 
  peaches 
  are 
  

   peach 
  twig 
  borers, 
  so 
  named 
  be- 
  

  

  