﻿50 
  THE 
  DISPERSION 
  OF 
  THE 
  GIPSY 
  MOTH. 
  

  

  record 
  of 
  infestation 
  of 
  Westboro, 
  which 
  was 
  much 
  nearer 
  the 
  badly 
  

   infested 
  territory, 
  and, 
  other 
  things 
  being 
  equal, 
  should 
  have 
  become 
  

   badly 
  infested 
  sooner 
  than 
  Townsend, 
  where 
  the 
  first 
  infestation 
  was 
  

   located 
  a 
  year 
  later. 
  

  

  The 
  scouting 
  of 
  Dunbarton 
  and 
  Farmington, 
  N. 
  H., 
  has 
  been 
  car- 
  

   ried 
  on 
  by 
  scouts 
  working 
  under 
  the 
  direction 
  of 
  Mr. 
  D. 
  M. 
  Rogers, 
  

   and 
  Table 
  VII 
  shows 
  that 
  the 
  infestation 
  has 
  been 
  greater 
  than 
  

   that 
  in 
  the 
  towns 
  given 
  in 
  central 
  Massachusetts, 
  and 
  about 
  the 
  

   same 
  as 
  that 
  found 
  in 
  Townsend. 
  

  

  It 
  will 
  be 
  observed 
  that 
  in 
  Westboro 
  seven 
  colonies, 
  containing 
  377 
  

   egg 
  clusters, 
  were 
  found 
  in 
  1906-7, 
  which 
  indicates 
  that 
  the 
  moth 
  

   was 
  present 
  the 
  previous 
  year, 
  and 
  probably 
  would 
  have 
  been 
  found 
  

   if 
  there 
  had 
  been 
  sufficient 
  time 
  to 
  make 
  a 
  thorough 
  inspection. 
  

   In 
  the 
  winter 
  of 
  1911-12 
  214 
  colonies 
  were 
  found 
  and 
  1,897 
  egg 
  

   clusters 
  were 
  treated. 
  When 
  this 
  is 
  compared 
  with 
  the 
  record 
  given 
  

   for 
  Townsend, 
  which 
  started 
  from 
  one 
  egg 
  cluster 
  in 
  the 
  winter 
  of 
  

   1907-8, 
  one 
  can 
  not 
  escape 
  the 
  conviction, 
  inasmuch 
  as 
  most 
  of 
  the 
  

   infestations 
  recorded 
  in 
  the 
  winter 
  of 
  1911-12 
  were 
  in 
  localities 
  which 
  

   had 
  previously 
  not 
  been 
  known 
  to 
  be 
  infested, 
  that 
  the 
  rapid 
  infes- 
  

   tation 
  of 
  this 
  territory 
  was 
  due 
  to 
  the 
  dispersion 
  of 
  young 
  caterpillars 
  

   by 
  the 
  wind. 
  

  

  PLANS 
  FOR 
  SCOUTING 
  WOODLAND 
  AREAS. 
  

  

  Many 
  data 
  have 
  been 
  given 
  showing 
  that 
  the 
  dispersion 
  of 
  the 
  

   gipsy 
  moth 
  is 
  largely 
  due 
  to 
  small 
  caterpillars 
  carried 
  by 
  the 
  

   wind, 
  but 
  it 
  seemed 
  desirable 
  to 
  determine 
  whether 
  the 
  woodland 
  

   areas 
  in 
  the 
  towns 
  where 
  only 
  a 
  few 
  colonies 
  existed 
  were 
  becoming 
  

   infested 
  by 
  this 
  insect. 
  The 
  matter 
  was 
  thoroughly 
  discussed 
  by 
  

   Messrs. 
  Fiske, 
  Rogers, 
  and 
  the 
  writer, 
  and 
  as 
  a 
  result 
  plans 
  were 
  

   made 
  to 
  scout 
  large 
  areas 
  in 
  several 
  of 
  the 
  outlying 
  towns. 
  The 
  

   plans 
  were 
  approved 
  by 
  Dr. 
  L. 
  O. 
  Howard. 
  It 
  was 
  arranged 
  that 
  

   the 
  scouting 
  work 
  should 
  be 
  carried 
  on 
  under 
  the 
  direction 
  of 
  Mr. 
  

   Rogers, 
  and 
  it 
  was 
  begun 
  in 
  October, 
  1911. 
  Owing 
  to 
  the 
  severe 
  

   winter 
  and 
  heavy 
  snowfall 
  in 
  the 
  infested 
  territory 
  it 
  was 
  impossible 
  

   to 
  finish 
  all 
  the 
  towns 
  until 
  late 
  in 
  the 
  spring 
  of 
  1912. 
  The 
  work 
  was 
  

   carried 
  through, 
  however, 
  and 
  a 
  statement 
  of 
  the 
  results 
  follows. 
  

  

  The 
  original 
  plan 
  contemplated 
  the 
  examination 
  of 
  every 
  tree 
  in 
  

   the 
  whole 
  or 
  a 
  part 
  of 
  the 
  towns 
  of 
  Lisbon 
  and 
  Yarmouth, 
  Me., 
  

   Milton, 
  Tilton, 
  and 
  Bennington, 
  N. 
  H., 
  and 
  Gardner, 
  Grafton, 
  and 
  

   Wareham, 
  Mass. 
  (See 
  fig. 
  6.) 
  It 
  will 
  be 
  noted 
  that 
  these 
  towns 
  are 
  

   located 
  in 
  the 
  sparsely 
  infested 
  area 
  (map 
  l),and 
  it 
  was 
  expected 
  that 
  

   some 
  interesting 
  data 
  on 
  wind 
  dispersion 
  would 
  be 
  secured. 
  Work 
  in 
  

   Bennington, 
  N. 
  H., 
  was 
  carried 
  on 
  under 
  the 
  direction 
  of 
  General 
  

   Foreman 
  I. 
  L. 
  Bailey 
  ; 
  that 
  in 
  Maine 
  and 
  in 
  Tilton 
  and 
  Milton, 
  N. 
  H., 
  

   and 
  Grafton, 
  Mass., 
  was 
  directed 
  by 
  General 
  Foreman 
  H. 
  L. 
  Mcln- 
  

  

  