﻿THE 
  FRUIT-TREE 
  LEAF-ROLLER. 
  101 
  

  

  remainder 
  of 
  their 
  eggs. 
  This 
  restless 
  habit 
  of 
  the 
  females 
  may 
  

   account 
  for 
  the 
  many 
  small 
  egg 
  masses 
  that 
  are 
  found 
  in 
  the 
  orchard. 
  

   The 
  eggs 
  are 
  usually 
  laid 
  at 
  night. 
  Moths 
  have, 
  however, 
  been 
  seen 
  

   laying 
  eggs 
  as 
  early 
  in 
  the 
  evening 
  as 
  5.30. 
  

  

  SUMMARY 
  OF 
  LIFE 
  HISTORY. 
  

  

  The 
  larval 
  stage 
  in 
  the 
  material 
  under 
  observation 
  varied 
  from 
  

   24 
  to 
  35 
  days, 
  the 
  average 
  being 
  28.05 
  days; 
  the 
  pupal 
  stage 
  from 
  9 
  

   to 
  15 
  days, 
  the 
  average 
  being 
  11.25 
  days; 
  and 
  the 
  adult 
  or 
  moth 
  stage 
  

   from 
  2 
  to 
  3 
  days 
  for 
  the 
  males 
  and 
  3 
  to 
  4 
  days 
  for 
  the 
  females. 
  The 
  

   life 
  of 
  the 
  moths 
  is 
  probably 
  longer 
  than 
  this 
  under 
  normal 
  condi- 
  

   tions. 
  Females 
  were 
  depositing 
  eggs 
  between 
  2 
  and 
  3 
  days 
  after 
  

   emergence. 
  In 
  the 
  field 
  (under 
  Colorado 
  conditions) 
  the 
  period 
  of 
  

   egg 
  laying 
  extended 
  from 
  about 
  the 
  second 
  week 
  in 
  June 
  to 
  the 
  middle 
  

   of 
  July, 
  the 
  maximum 
  being 
  reached 
  from 
  June 
  25 
  to 
  July 
  10. 
  The 
  

   eggs 
  remain 
  on 
  the 
  trees 
  unhatched 
  until 
  the 
  following 
  spring. 
  

   Hence 
  this 
  insect 
  has 
  only 
  one 
  generation 
  in 
  the 
  course 
  of 
  a 
  year. 
  

   The 
  hatching 
  of 
  the 
  eggs 
  in 
  the 
  spring 
  may 
  extend 
  over 
  a 
  period 
  of 
  

   many 
  days, 
  depending 
  on 
  the 
  weather. 
  The 
  time 
  of 
  hatching 
  of 
  

   the 
  eggs 
  will 
  vary 
  greatly 
  with 
  the 
  different 
  seasons 
  and 
  hi 
  different 
  

   sections 
  of 
  the 
  country. 
  Generally 
  speaking, 
  it 
  may 
  be 
  stated 
  that 
  

   the 
  eggs 
  will 
  begin 
  hatching 
  about 
  the 
  time 
  the 
  cluster 
  buds 
  of 
  early- 
  

   blooming 
  varieties 
  of 
  apples 
  are 
  beginning 
  to 
  show, 
  but 
  before 
  they 
  

   have 
  fully 
  separated. 
  

  

  HIBERNATION. 
  

  

  The 
  fruit-tree 
  leaf-roller 
  passes 
  the 
  winter 
  in 
  the 
  egg 
  stage. 
  The 
  

   eggs 
  are 
  deposited 
  in 
  masses 
  on 
  various 
  parts 
  of 
  the 
  host 
  plants 
  by 
  

   females 
  during 
  June 
  or 
  July. 
  The 
  trunks 
  and 
  larger 
  limbs 
  or 
  branches 
  

   are 
  often 
  just 
  "peppered" 
  with 
  them. 
  A 
  goodly 
  number 
  are 
  also 
  

   to 
  be 
  found 
  on 
  the 
  smaller 
  branches, 
  twigs, 
  and 
  fruit 
  spurs. 
  Egg 
  

   masses 
  are, 
  however, 
  not 
  only 
  laid 
  on 
  fruit 
  trees, 
  but 
  on 
  various 
  

   other 
  plants. 
  The 
  writer 
  has 
  observed 
  them 
  on 
  elm, 
  soft 
  maple, 
  

   box-elder, 
  currant, 
  gooseberry, 
  raspberry, 
  grape, 
  rose, 
  lilac, 
  and 
  

   Virginia 
  creeper. 
  Besides 
  the 
  above 
  plants, 
  the 
  masses 
  have 
  been 
  

   noticed 
  on 
  spray 
  tanks, 
  on 
  sides 
  of 
  buildings, 
  and 
  on 
  fences. 
  On 
  

   account 
  of 
  the 
  indiscriminate 
  deposition 
  of 
  its 
  eggs 
  this 
  insect 
  will 
  

   be 
  found 
  to 
  be 
  more 
  difficult 
  of 
  control. 
  

  

  Observations 
  have 
  shown 
  that 
  the 
  eggs 
  begin 
  hatching 
  quite 
  early 
  

   in 
  the 
  spring 
  just 
  as 
  the 
  cluster 
  buds 
  on 
  early 
  blooming 
  varieties 
  of 
  

   apples 
  are 
  exposed. 
  About 
  the 
  time 
  thai 
  practically 
  all 
  the 
  cluster 
  

   buds 
  have 
  fully 
  separated 
  nearly 
  one-half 
  of 
  the 
  eggs 
  have 
  hatched. 
  

   On 
  late-blooming 
  varieties 
  of 
  apples, 
  Buch 
  as 
  Borne 
  Beauty, 
  Jeniton, 
  

  

  etc., 
  the 
  date 
  of 
  appearance 
  of 
  the 
  larva' 
  is 
  the 
  same, 
  although 
  the 
  

  

  buds 
  are 
  not 
  nearly 
  so 
  tar 
  advanced. 
  On 
  Koine 
  Beauty 
  ami 
  Jeniton 
  

  

  