﻿40 
  

  

  DECIDUOUS 
  PEUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  Table 
  XV. 
  — 
  Time 
  of 
  second-brood 
  larvx 
  of 
  the 
  grape-berry 
  moth 
  leaving 
  berries 
  in 
  1909; 
  

   from 
  fruit 
  collected 
  in 
  the 
  field, 
  North 
  East, 
  Pa. 
  

  

  Date 
  of 
  

   leaving 
  

   the 
  fruit. 
  

  

  Num- 
  

   ber 
  of 
  

   larvae. 
  

  

  Date 
  of 
  

   leaving 
  

   the 
  fruit. 
  

  

  Num- 
  

   ber 
  of 
  

   larvae. 
  

  

  Date 
  of 
  

   leaving 
  

   the 
  fruit. 
  

  

  Num- 
  

   ber 
  of 
  

   larvae. 
  

  

  Date 
  of 
  

   leaving 
  

   the 
  fruit. 
  

  

  Num- 
  

   ber 
  of 
  

   larvae. 
  

  

  Sept.22 
  

   23 
  

   24 
  

   25 
  

   26 
  

   27 
  

   28 
  

   29 
  

   30 
  

   Oct. 
  1 
  

   2 
  

   3 
  

   4 
  

   5 
  

  

  11 
  

   21 
  

   15 
  

   19 
  

   8 
  

   11 
  

   16 
  

   21 
  

   12 
  

   12 
  

   73 
  

   39 
  

   38 
  

   45 
  

  

  Oct. 
  6 
  

   7 
  

   8 
  

   9 
  

  

  10 
  

   11 
  

   12 
  

   13 
  

   14 
  

   15 
  

   16 
  

   17 
  

   18 
  

   19 
  

  

  53 
  

  

  50 
  

  

  40 
  

  

  38 
  

  

  50 
  

  

  24 
  

  

  14 
  

  

  5 
  

  

  

  

  2 
  

  

  1 
  

  

  2 
  

  

  4 
  

  

  

  

  Oct. 
  20 
  

   21 
  

   22 
  

   23 
  

   24 
  

   25 
  

   26 
  

   27 
  

   28 
  

   29 
  

   30 
  

   31 
  

  

  Nov. 
  1 
  

   2 
  

  

  2 
  

   9 
  

   5 
  

   5 
  

   

   7 
  

   13 
  

   1 
  

   

   4 
  

   1 
  

   4 
  

   24 
  

   19 
  

  

  Nov. 
  3 
  

   4 
  

   5 
  

   6 
  

   7 
  

   8 
  

   9 
  

   10 
  

   11 
  

   12 
  

   13 
  

   14 
  

  

  Total 
  . 
  

  

  6 
  

   

   1 
  

   

   1 
  

   7 
  

   3 
  

   

   2 
  

   4 
  

   1 
  

   2 
  

  

  745 
  

  

  In 
  all, 
  745 
  larvae 
  emerged. 
  The 
  table 
  shows 
  that 
  569, 
  or 
  four- 
  

   fifths 
  of 
  the 
  larvae, 
  left 
  the 
  fruit 
  in 
  20 
  days, 
  from 
  September 
  22 
  to 
  

   October 
  11, 
  and 
  that 
  the 
  remaining 
  149, 
  or 
  one-fifth, 
  left 
  the 
  fruit 
  

   between 
  October 
  12 
  and 
  November 
  14, 
  a 
  period 
  of 
  34 
  days, 
  making 
  a 
  

   total 
  period 
  of 
  45 
  days 
  during 
  which 
  second-brood 
  larvae 
  were 
  leaving 
  

   the 
  fruit. 
  Since 
  the 
  heavy 
  shipment 
  of 
  Concord 
  grapes 
  does 
  not 
  

  

  

  

  

  

  ffiHn^^Hs'T 
  

  

  

  

  f^trrrf!iTii 
  11 
  11 
  P 
  7 
  

  

  liliip 
  

  

  7o 
  B 
  : 
  1 
  

  

  

  

  

  

  .,-■..-'; 
  - 
  

  

  1 
  j 
  

   *£ 
  30] 
  

  

  £ 
  10 
  

  

  

  

  

  Ik* 
  

  

  

  

  

  

  

  PPI 
  1J43 
  » 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  20 
  22 
  

  

  Sep 
  

  

  24- 
  Zk> 
  28 
  30 
  2 
  4 
  b 
  8 
  10 
  12 
  14. 
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  18 
  20 
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  2b 
  28 
  30 
  I 
  , 
  

  

  Member 
  October* 
  

  

  557 
  

   Nave 
  

  

  9 
  II 
  13 
  15 
  

  

  ?mber 
  

  

  Fig. 
  12. 
  — 
  Diagram 
  showing 
  time 
  of 
  leaving 
  the 
  grape 
  berries 
  by 
  second-brood 
  larvae 
  of 
  the 
  grape-berry 
  

   moth, 
  from 
  fruit 
  collected 
  in 
  the 
  field, 
  North 
  East, 
  Pa., 
  1909. 
  Daily 
  mean 
  temperature 
  Fahrenheit. 
  

   (Original.) 
  

  

  occur 
  until 
  October 
  1, 
  fruit 
  in 
  infested 
  vineyard 
  areas 
  would 
  have 
  to 
  

   be 
  removed 
  during 
  the 
  first 
  week 
  of 
  the 
  picking 
  season 
  in 
  order 
  to 
  

   remove 
  many 
  of 
  the 
  larvae 
  from 
  the 
  vineyard 
  with 
  the 
  crop. 
  

  

  Figure 
  12 
  shows 
  the 
  correlation 
  between 
  the 
  fluctuations 
  of 
  tem- 
  

   perature 
  and 
  the 
  activity 
  of 
  the 
  mature 
  larvae 
  of 
  the 
  second 
  brood 
  

   in 
  leaving 
  the 
  grape 
  berries 
  in 
  the 
  fall 
  of 
  1909. 
  The 
  dotted 
  line 
  

   represents 
  the 
  daily 
  mean 
  temperature, 
  and 
  the 
  solid 
  line 
  the 
  rate 
  

   of 
  emergence 
  of 
  the 
  larvae 
  from 
  the 
  berries. 
  It 
  will 
  be 
  observed 
  that 
  

  

  