﻿50 
  

  

  CIRCULAR 
  

  

  r. 
  S. 
  DEPARTME^^: 
  of 
  AGRICrLirRE 
  

  

  the 
  lights 
  at 
  iiight. 
  There 
  may 
  be 
  

   one 
  or 
  more 
  generations, 
  but 
  later 
  

   generations 
  are 
  of 
  little 
  conse- 
  

   quence, 
  as 
  vegetation 
  is 
  plentiful 
  

   by 
  the 
  time 
  they 
  appear. 
  Eggs 
  are 
  

   deposited 
  in 
  the 
  fall 
  on 
  the 
  trees 
  

   or 
  cover 
  crops 
  in 
  patches 
  of 
  a 
  him- 
  

   dred 
  or 
  more. 
  After 
  the 
  eggs 
  have 
  

   hatched 
  the 
  small 
  Trorms 
  feed 
  for 
  

   a 
  time 
  before 
  going 
  into 
  hiberna- 
  

   tion. 
  

  

  CONTROL 
  

  

  The 
  best 
  ^ay 
  t<D 
  control 
  cut- 
  

   worms 
  is 
  to 
  place 
  a 
  small 
  handful 
  

   of 
  10-j)ercent 
  DDT 
  dust 
  on 
  the 
  

   lower 
  trunk 
  of 
  the 
  tree 
  and 
  on 
  the 
  

   gi^oimd 
  about 
  the 
  base. 
  The 
  cut- 
  

   worms 
  come 
  in 
  contact 
  with 
  the 
  

   DDT 
  as 
  they 
  climb 
  mto 
  the 
  tree, 
  

   and 
  are 
  killed 
  by 
  it. 
  

  

  Lygus 
  Bugs 
  

  

  Lygus 
  bugs 
  (fig. 
  60. 
  A) 
  appear 
  

   in 
  the 
  trees 
  early 
  in 
  the 
  s]3ring 
  and 
  

   puncture 
  the 
  swelling 
  fi'uit 
  and 
  

  

  leaf 
  buds 
  ffiof. 
  60. 
  5)."suckino: 
  the 
  

  

  Figure 
  60. 
  — 
  Lygus 
  bug: 
  A. 
  Adxilt 
  (en- 
  

   larged 
  ': 
  B. 
  adult 
  on 
  peach 
  bud. 
  

  

  sap 
  from 
  them. 
  Their 
  iDresence 
  is 
  

   often 
  first 
  made 
  known 
  by 
  the 
  

   brownish 
  drops 
  of 
  sap 
  exuding 
  

   from 
  these 
  punctures. 
  This 
  loss 
  

   of 
  saj) 
  causes 
  the 
  buds 
  to 
  dry, 
  and 
  

   in 
  the 
  case 
  of 
  frtiit 
  btids 
  the 
  blos- 
  

   soms 
  may 
  never 
  open, 
  or, 
  if 
  they 
  

   do. 
  they 
  may 
  be 
  deformed. 
  When 
  

   the 
  bugs 
  are 
  sufficiently 
  ntimerous. 
  

   the 
  injury 
  is 
  severe 
  and 
  the 
  entire 
  

   croi3 
  may 
  be 
  lost. 
  The 
  degree 
  of 
  

  

  injury 
  depends 
  not 
  only 
  on 
  the 
  

   number 
  of 
  bugs 
  but 
  on 
  the 
  weather. 
  

   Continued 
  settled 
  warm 
  weather 
  in 
  

   March 
  or 
  early 
  in 
  Apiril, 
  before 
  

   alfalfa 
  and 
  other 
  ground 
  cro^DS 
  

   have 
  develox^ed. 
  causes 
  the 
  bugs 
  to 
  

   feed 
  in 
  the 
  trees; 
  cold, 
  rainy, 
  or 
  

   windy 
  weather 
  at 
  this 
  time 
  pre- 
  

   vents 
  extensive 
  feeding. 
  Pears 
  

   and 
  Delicious 
  apples, 
  as 
  well 
  as 
  

   peaches, 
  are 
  susceptible 
  to 
  this 
  in- 
  

   jury. 
  The 
  bugs 
  also 
  sometimes 
  

   feed 
  on 
  the 
  yotmg 
  ( 
  ng. 
  '25) 
  and 
  ma- 
  

   turing 
  fruit 
  and 
  cause 
  dry 
  or 
  corky 
  

   and 
  sunken 
  spots. 
  Lygus 
  btigs 
  oc- 
  

   cur 
  throughout 
  the 
  Pacific 
  Xorth- 
  

   west 
  : 
  they 
  are 
  apparently 
  native 
  

   insects. 
  

  

  LIFE 
  HISTORY 
  

  

  The 
  adult 
  lyg^us 
  bugs 
  are 
  nearly 
  

   one-fourth 
  inch 
  long, 
  dirty 
  ^'ay- 
  

   ish 
  or 
  greenish, 
  with 
  variable 
  

   markings. 
  They 
  come 
  out 
  of 
  

   hibernation 
  during 
  the 
  first 
  wann, 
  

   sunny 
  days 
  of 
  early 
  sprmg 
  and 
  

   feed 
  for 
  a 
  time 
  on 
  frtiit-tree 
  buds 
  

   and 
  the 
  legtuninous 
  cover 
  crops. 
  

   They 
  are 
  active, 
  flying 
  readily 
  or 
  

   moving 
  around 
  to 
  the 
  opposite 
  

   side 
  of 
  a 
  twig 
  or 
  bud 
  when 
  ap- 
  

   proached, 
  and 
  are 
  not 
  easily 
  seen. 
  

   Eggs 
  are 
  laid 
  in 
  the 
  tender 
  shoots 
  

   or 
  in 
  the 
  flower 
  heads 
  of 
  a 
  number 
  

   of 
  jDlants. 
  and 
  the 
  nymphs, 
  which 
  

   resemble 
  the 
  adults, 
  except 
  that 
  

   they 
  are 
  smaller 
  and 
  have 
  no 
  

   wings, 
  feed 
  chiefly 
  on 
  cover 
  crops 
  

   and 
  weeds. 
  Growth 
  is 
  attained 
  

   in 
  less 
  than 
  a 
  month. 
  nym^Dhs 
  

   going 
  through 
  a 
  series 
  of 
  molts 
  as 
  

   they 
  increase 
  in 
  size. 
  There 
  are 
  

   three 
  or 
  four 
  broods 
  during 
  the 
  

   season, 
  and 
  the 
  bugs 
  are 
  often 
  

   veiy 
  numerous 
  in 
  the 
  fall. 
  Many 
  

   bugs 
  die 
  when 
  the 
  first 
  cold 
  

   weather 
  comes 
  and 
  the 
  mortality 
  

   among 
  those 
  hibernating 
  is 
  ap- 
  

   J3arently 
  high. 
  

  

  CONTROL 
  

  

  Lygus 
  bugs 
  are 
  susceptible 
  to 
  

   DDT. 
  and 
  if 
  the 
  infested 
  areas 
  

  

  