﻿38 
  

  

  DECIDUOUS 
  FRUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  life-cycle 
  period 
  was 
  40 
  days, 
  the 
  average 
  length 
  43.8 
  days 
  and 
  the 
  

   longest 
  53 
  days. 
  There 
  is 
  a 
  difference 
  of 
  less 
  than 
  half 
  a 
  day 
  in 
  the 
  

   averages 
  for 
  the 
  two 
  separate 
  rearings. 
  

  

  SECOND 
  GENERATION. 
  

  

  Incubation 
  period 
  of 
  second-brood 
  eggs. 
  — 
  For 
  reasons 
  previously 
  

   assigned 
  the 
  record 
  of 
  egg 
  laying 
  by 
  the 
  moths 
  in 
  confinement 
  is 
  

   very 
  scanty. 
  Table 
  XII 
  gives 
  the 
  length 
  of 
  this 
  stage 
  for 
  nine 
  eggs 
  

   of 
  known 
  origin. 
  The 
  incubation 
  period 
  of 
  these 
  eggs 
  is 
  longer 
  than 
  

   in 
  the 
  record 
  secured 
  for 
  eggs 
  deposited 
  by 
  the 
  spring-emerging 
  

   moths. 
  The 
  number 
  of 
  eggs 
  recorded, 
  however, 
  is 
  far 
  too 
  small 
  to 
  

   admit 
  of 
  generalization 
  on 
  this 
  topic. 
  

  

  Table 
  XII. 
  — 
  Length 
  of 
  incubation 
  of 
  second-brood 
  eggs 
  of 
  the 
  grape-berry 
  moth, 
  North 
  

  

  East, 
  Pa., 
  1909. 
  

  

  No. 
  of 
  

   observa- 
  

   tion. 
  

  

  Date- 
  

  

  Days 
  of 
  

   incuba- 
  

   tion. 
  

  

  No. 
  of 
  

   observa- 
  

   tion. 
  

  

  Date- 
  

  

  Days 
  of 
  

   incuba- 
  

   tion. 
  

  

  Laid. 
  

  

  Hatched. 
  

  

  Laid. 
  

  

  Hatched. 
  

  

  1 
  

   2 
  

   3 
  

   4 
  

  

  5 
  

  

  Aug. 
  27 
  

   Aug. 
  30 
  

  

  ...do 
  

  

  Aug. 
  31 
  

   Sept. 
  1 
  

  

  Sept. 
  7 
  

   Sept. 
  9 
  

   Sept. 
  10 
  

   Sept. 
  11 
  

  

  11 
  

   10 
  

   11 
  

   11 
  

   10 
  

  

  6 
  

  

  7 
  

   8 
  

   9 
  

  

  Sept. 
  2 
  

   Sept. 
  4 
  

  

  ...do 
  

  

  Sept. 
  5 
  

  

  Sept. 
  12 
  

   Sept. 
  13 
  

   Sept. 
  14 
  

   ...do 
  

  

  10 
  

   9 
  

  

  10 
  

   9 
  

  

  Days 
  of 
  incubation: 
  

  

  Average 
  10. 
  1 
  

  

  Maximum 
  11 
  

  

  Minimum 
  9 
  

  

  Length 
  of 
  feeding 
  period 
  of 
  second-brood 
  larvse. 
  — 
  Tables 
  XIII-XIV 
  

   give 
  the 
  feeding 
  period 
  of 
  second-brood 
  larvse 
  under 
  two 
  entirely 
  

   different 
  conditions, 
  namely, 
  larvse 
  reared 
  on 
  green 
  fruit 
  in 
  stock 
  

   jars 
  under 
  a 
  rearing 
  shelter 
  (Table 
  XIII) 
  and 
  larvae 
  feeding 
  on 
  

   fruit 
  growing 
  on 
  a 
  vine 
  (Table 
  XIV) 
  in 
  a 
  large 
  outdoor 
  rearing 
  cage 
  

   (see 
  PL 
  VII, 
  fig. 
  2). 
  

  

  Table 
  XIII. 
  — 
  Length 
  of 
  the 
  feeding 
  period 
  of 
  the 
  second-brood 
  larvse 
  of 
  the 
  grape-berry 
  

   moth 
  under 
  confinement 
  in 
  jars, 
  North 
  East, 
  Pa., 
  1909. 
  

  

  No. 
  of 
  

   observa- 
  

   tion. 
  

  

  Larvse 
  

  

  Larvae 
  

  

  Number 
  

  

  No. 
  of 
  

   observa- 
  

   tion. 
  

  

  Larvae 
  

  

  Larvse 
  

  

  Number 
  

  

  hatched. 
  

  

  left 
  fruit. 
  

  

  of 
  days. 
  

  

  hatched. 
  

  

  left 
  fruit. 
  

  

  of 
  days. 
  

  

  1 
  

  

  Aug. 
  27 
  

  

  Oct. 
  6 
  

  

  40 
  

  

  12 
  

  

  Aug. 
  30 
  

  

  Oct. 
  26 
  

  

  57 
  

  

  2 
  

  

  ...do 
  

  

  Oct. 
  9 
  

  

  43 
  

  

  13 
  

  

  ...do 
  

  

  Nov. 
  1 
  

  

  63 
  

  

  3 
  

  

  Aug. 
  29 
  

  

  Oct. 
  17 
  

  

  49 
  

  

  14 
  

  

  ...do 
  

  

  ...do 
  

  

  63 
  

  

  4 
  

  

  ...do 
  

  

  ...do 
  

  

  49 
  

  

  15 
  

  

  Sept. 
  11 
  

  

  Nov. 
  3 
  

  

  53 
  

  

  5 
  

  

  ...do 
  

  

  Oct. 
  20 
  

  

  52 
  

  

  16 
  

  

  ...do 
  

  

  Oct. 
  25 
  

  

  44 
  

  

  6 
  

  

  ...do 
  

  

  Oct. 
  21 
  

  

  53 
  

  

  17 
  

  

  ...do 
  

  

  Nov. 
  3 
  

  

  53 
  

  

  7 
  

  

  ...do 
  

  

  ...do 
  

  

  53 
  

  

  18 
  

  

  ...do 
  

  

  ...do 
  

  

  53 
  

  

  8 
  

  

  Aug. 
  30 
  

  

  Oct. 
  22 
  

  

  53 
  

  

  19 
  

  

  ...do 
  

  

  ...do 
  

  

  53 
  

  

  9 
  

  

  ...do 
  

  

  Oct. 
  25 
  

  

  56 
  

  

  Averaee 
  

  

  

  52.6 
  

  

  10 
  

   11 
  

  

  ...do 
  

  

  ...do 
  

  

  ...do 
  

  

  ...do 
  

  

  56 
  

   56 
  

  

  Ma 
  

   Mh 
  

  

  

  

  63 
  

  

  40 
  

  

  

  

  

  

  