﻿THE 
  GRAPE-BEERY 
  MOTH. 
  

  

  37 
  

  

  Table 
  IX. 
  — 
  Summary 
  of 
  Table 
  VIII 
  showing 
  number 
  and 
  percentage 
  of 
  first-brood 
  

   larvae 
  of 
  the 
  grape-berry 
  moth 
  that 
  transform. 
  

  

  Observations 
  on— 
  

  

  Number. 
  

  

  Per 
  cent. 
  

  

  Number 
  of 
  larvae 
  

  

  Number 
  of 
  moths 
  emerged 
  . 
  . 
  

   Number 
  of 
  hibernating 
  pupa 
  

   Number 
  of 
  parasitized 
  larva? 
  

   Number 
  of 
  dead 
  individuals 
  

  

  374 
  

  

  100.0 
  

  

  292 
  

  

  78.1 
  

  

  29 
  

  

  7.8 
  

  

  11 
  

  

  2.9 
  

  

  42 
  

  

  11.2 
  

  

  Length 
  of 
  life 
  cycle 
  of 
  first 
  generation. 
  — 
  The 
  results 
  of 
  the 
  pre- 
  

   ceding 
  observations 
  on 
  the 
  separate 
  stages 
  of 
  the 
  grape-berry 
  moth 
  

   have 
  been 
  summarized 
  in 
  Table 
  X, 
  which 
  shows 
  an 
  average 
  period 
  

   of 
  44.2 
  days 
  for 
  the 
  life 
  cycle 
  of 
  the 
  first 
  generation. 
  

  

  Table 
  X. 
  — 
  Life 
  cycle 
  of 
  the 
  first 
  generation 
  of 
  the 
  grape-berry 
  moth 
  as 
  determined 
  from 
  

   observations 
  on 
  the 
  separate 
  stages; 
  summaries 
  from 
  the 
  previous 
  tables. 
  

  

  Stages 
  of 
  development. 
  

  

  Egg 
  stage 
  

  

  Length 
  of 
  feeding 
  

  

  Making 
  of 
  cocoon 
  

  

  Pupal 
  stage 
  

  

  Days 
  duration 
  of 
  life 
  cycle 
  

  

  Average. 
  

  

  Maximum. 
  

  

  Minimum. 
  

  

  Days. 
  

   6.0 
  

   23.0 
  

  

  } 
  15.2 
  

  

  Days. 
  

  

  8 
  

   33 
  

  

  25 
  

  

  Days. 
  

  

  4 
  

   19 
  

  

  10 
  

  

  44.2 
  

  

  66 
  

  

  33 
  

  

  Table 
  XI. 
  — 
  Life 
  cycle 
  of 
  the 
  first 
  generation 
  of 
  the 
  grape-berry 
  moth, 
  as 
  observed 
  by 
  

   rearing 
  i?i 
  1909 
  at 
  North 
  East, 
  Pa. 
  

  

  No. 
  

  

  Dates 
  of— 
  

  

  Days 
  duration- 
  

  

  Egg 
  

   deposi- 
  

  

  tion. 
  

  

  Hatch- 
  

   ing. 
  

  

  Leaving 
  

   fruit. 
  

  

  Pupa- 
  

   tion. 
  

  

  Emerg- 
  

   ence 
  of 
  

   moths. 
  

  

  Incu- 
  

   bation 
  

   of 
  eggs. 
  

  

  Feed- 
  

   ing 
  

  

  period 
  

   of 
  

  

  larvae. 
  

  

  Larvae 
  

   mak- 
  

   ing 
  

   cocoon. 
  

  

  Pupal 
  

   stage 
  

  

  Life 
  

   cycle. 
  

  

  1 
  

   2 
  

   3 
  

   4 
  

   5 
  

   6 
  

   7 
  

   8 
  

   9 
  

  

  10 
  

   11 
  

   12 
  

  

  July 
  2 
  

   July 
  3 
  

   July 
  5 
  

   July 
  7 
  

  

  ...do 
  

  

  July 
  8 
  

  

  ...do 
  

  

  ...do.... 
  

   July 
  '.) 
  

  

  ...do 
  

  

  ...do.... 
  

   July 
  10 
  

  

  July 
  10 
  

  

  Julv 
  11 
  

   ...do.... 
  

  

  July 
  12 
  

   ...do 
  

  

  July 
  13 
  

  

  ...do 
  

  

  ...do.... 
  

   ...do.... 
  

   ...do.... 
  

   ...do.... 
  

  

  July 
  16 
  

  

  Aug. 
  5 
  

   Julv 
  31 
  

  

  ...do 
  

  

  ...do 
  

  

  Aug. 
  9 
  

  

  

  8 
  

   8 
  

   6 
  

   5 
  

   5 
  

   5 
  

   5 
  

   5 
  

   4 
  

   4 
  

   4 
  

   6 
  

  

  26 
  

   20 
  

   20 
  

   19 
  

   25 
  

   22 
  

   23 
  

  

  4 
  

  

  

  

  Aug. 
  14 
  

   Aug. 
  18 
  

   Aug. 
  16 
  

  

  

  42 
  

  

  

  

  

  44 
  

   40 
  

  

  

  Aug. 
  6 
  

   Aug. 
  4 
  

   Aug. 
  5 
  

  

  Aug. 
  5 
  

   Aug. 
  6 
  

   Aug. 
  15 
  

   Aug. 
  5 
  

  

  Aug. 
  7 
  

   Aug. 
  6 
  

   ...do 
  

  

  Aug. 
  6 
  

   Aug. 
  7 
  

   Aug. 
  17 
  

   Aug. 
  8 
  

  

  I 
  

   2 
  

  

  1 
  

  

  

  

  

  

  Aug. 
  19 
  

   ...do 
  

  

  13 
  

  

  42 
  

   42 
  

  

  23 
  

   24 
  

   33 
  

   20 
  

  

  I 
  

   1 
  

  

  2 
  

   3 
  

  

  

  

  

  

  Aug. 
  31 
  

  

  14 
  

  

  53 
  

  

  

  

  

  A 
  

  

  nsrage 
  

  

  5.4 
  

   8 
  

   4 
  

  

  23.2 
  

  

  33 
  

   19 
  

  

  1.9 
  

  

  3 
  

  

  1 
  

  

  13.5 
  

   14 
  

   13 
  

  

  43.8 
  

   40 
  

  

  M 
  

  

  ixiinum 
  

  

  M 
  

  

  nimum 
  

  

  

  

  The 
  average 
  figures 
  in 
  Tabic 
  X 
  agree 
  closely 
  with 
  the 
  result! 
  

   obtained 
  from 
  the 
  rearings 
  of 
  life-cycle 
  scries 
  (Table 
  XI). 
  It 
  will 
  

   bo 
  noted 
  under 
  the 
  life-cycle 
  column 
  that 
  six 
  individuals 
  completed 
  

   their 
  life 
  cycle 
  the 
  same 
  season, 
  while 
  six 
  pupae 
  wintered. 
  The 
  shortest 
  

  

  