﻿ORCHARD 
  INSECTS 
  PACIFIC 
  NORTHWEST 
  

  

  33 
  

  

  drop 
  off. 
  This 
  condition 
  seriously 
  

   affects 
  the 
  development 
  of 
  fruit 
  

   buds 
  for 
  the 
  following 
  year's 
  crop. 
  

   The 
  slugs 
  may 
  be 
  controlled 
  on 
  

   cherry 
  trees 
  in 
  the 
  same 
  manner 
  

   as 
  on 
  pear 
  trees. 
  Control 
  meas- 
  

   ures 
  and 
  the 
  life 
  history 
  are 
  given 
  

   on 
  page 
  28. 
  

  

  Cherry 
  Fruitworm 
  

  

  The 
  cherry 
  fruitworm 
  is 
  the 
  

   larva 
  of 
  a 
  small 
  moth 
  found 
  in 
  

   western 
  Washington 
  and 
  British 
  

   Columbia. 
  It 
  is 
  a 
  native 
  insect 
  

   that 
  originally 
  lived 
  on 
  the 
  wild 
  

   cherry. 
  The 
  larvae 
  bore 
  into 
  the 
  

   green 
  cherries 
  and 
  feed 
  about 
  the 
  

   pit. 
  Injured 
  cherries 
  are 
  often 
  

   misshapen. 
  

  

  LIFE 
  history 
  

  

  The 
  cherry 
  f 
  ruitworms 
  winter 
  as 
  

   full-grown 
  larvae 
  in 
  the 
  stubs 
  of 
  

   pruned 
  branches 
  or 
  in 
  cells 
  cut 
  

   into 
  the 
  corky 
  bark. 
  The 
  small 
  

   gray 
  moths 
  appear 
  in 
  May 
  or 
  early 
  

   June 
  and 
  deposit 
  eggs 
  singly 
  on 
  

   the 
  cherries, 
  usually 
  in 
  the 
  suture 
  

   or 
  at 
  the 
  stem 
  end. 
  The 
  eggs 
  are 
  

   opalescent, 
  circuhar, 
  flattened, 
  and 
  

   smaller 
  than 
  the 
  eggs 
  of 
  the 
  cod- 
  

   ling 
  moth. 
  They 
  hatch 
  in 
  about 
  

   10 
  clays 
  and 
  the 
  larvae 
  immediate- 
  

   ly 
  bore 
  into 
  the 
  fruit. 
  The 
  pink- 
  

   ish 
  larvae 
  are 
  about 
  three-eighths 
  

   inch 
  long 
  and 
  mature 
  in 
  about 
  e3 
  

   weeks. 
  There 
  is 
  only 
  one 
  brood 
  a 
  

   year. 
  

  

  control 
  

  

  The 
  measures 
  used 
  for 
  control- 
  

   ling 
  the 
  cherry 
  fruit 
  fly 
  (p. 
  32) 
  

   also 
  control 
  the 
  cherry 
  fruitworm 
  ; 
  

   therefore 
  special 
  sprays 
  are 
  usu- 
  

   ally 
  unnecessary. 
  

  

  Destructive 
  Prune 
  Worm 
  

  

  The 
  destructive 
  prune 
  worm 
  is 
  

   sometimes 
  a 
  pest 
  of 
  cherries, 
  par- 
  

   ticularly 
  in 
  Oregon. 
  Information 
  

   on 
  its 
  habits 
  and 
  control 
  will 
  be 
  

   found 
  on 
  page 
  42. 
  

  

  Pandemis 
  Moth 
  

  

  The 
  pandemis 
  moth 
  has 
  been 
  

   present 
  in 
  the 
  Pacific 
  Northwest 
  

   for 
  many 
  years, 
  but 
  only 
  occas- 
  

   sionally 
  does 
  it 
  become 
  a 
  pest. 
  It 
  

   is 
  similar 
  in 
  appearance 
  and 
  habits 
  

   to 
  the 
  oblique-banded 
  leaf 
  roller, 
  

   which 
  also 
  occurs 
  in 
  the 
  same 
  area, 
  

   and 
  also 
  to 
  the 
  fruit 
  tree 
  leaf 
  roller. 
  

   (See 
  p. 
  8.) 
  The 
  caterpillars 
  feed 
  

   on 
  apple, 
  apricot, 
  cherry, 
  plum, 
  

   and 
  prune, 
  but 
  apparently 
  not 
  

   on 
  peach. 
  

  

  LIFE 
  HISTORY 
  

  

  There 
  are 
  two 
  broods 
  of 
  this 
  in- 
  

   sect 
  in 
  a 
  year. 
  It 
  winters 
  as 
  a 
  small 
  

   larva 
  hiding 
  in 
  trash 
  or 
  in 
  a 
  web 
  

   constructed 
  on 
  the 
  tree 
  trunk 
  at 
  

   the 
  surface 
  of 
  the 
  ground. 
  The 
  

   larvae 
  crawl 
  up 
  the 
  trees 
  in 
  the 
  

   spring, 
  as 
  soon 
  as 
  the 
  leaves 
  are 
  

   out, 
  and 
  feed 
  on 
  the 
  foliage. 
  They 
  

   mature 
  in 
  May, 
  spinning 
  loose 
  

   cocoons 
  in 
  the 
  leaves. 
  The 
  moths 
  

   appear 
  in 
  late 
  May 
  and 
  in 
  June. 
  

   The 
  light 
  green 
  eggs 
  are 
  deposited 
  

   in 
  flat 
  clusters 
  of 
  90 
  to 
  150 
  on 
  the 
  

   smooth 
  upper 
  surface 
  of 
  the 
  leaves 
  

   (fig. 
  39, 
  A), 
  and 
  they 
  hatch 
  in 
  

   about 
  2 
  weeks. 
  The 
  small 
  larvae 
  

   start 
  feeding 
  on 
  the 
  tender 
  foliage 
  

   at 
  the 
  tips 
  of 
  the 
  branches 
  or 
  along 
  

   the 
  midribs 
  of 
  the 
  leaves, 
  and 
  

   develop 
  slowly. 
  Later, 
  they 
  feed 
  

   on 
  the 
  fruit. 
  On 
  cherries 
  they 
  are 
  

   most 
  often 
  found 
  feeding 
  about 
  

   the 
  stem 
  end, 
  and 
  some 
  of 
  them 
  

   may 
  burrow 
  into 
  the 
  fruit 
  (fig. 
  39, 
  

   B). 
  On 
  apricots, 
  a 
  single 
  larva 
  

   may 
  feed 
  on 
  all 
  fruits 
  in 
  a 
  cluster, 
  

   making 
  large 
  holes 
  in 
  the 
  sides. 
  

   Feeding 
  on 
  plums 
  and 
  apples 
  is 
  

   similar. 
  This 
  second 
  brood 
  ma- 
  

   tures 
  late 
  in 
  July 
  or 
  August. 
  

   Moths 
  from 
  this 
  brood 
  are 
  flying 
  

   in 
  August 
  and 
  September, 
  and 
  the 
  

   young 
  larvae 
  coming 
  from 
  their 
  

   eggs 
  feed 
  until 
  cold 
  w^eather 
  and 
  

   then 
  hibernate. 
  In 
  California 
  

   they 
  sometimes 
  feed 
  on 
  the 
  buds 
  

   during 
  the 
  winter. 
  

  

  