﻿62 
  THE 
  DISPERSION 
  OF 
  THE 
  GIPSY 
  MOTH. 
  

  

  ous 
  trees 
  will 
  probably 
  furnish 
  similar 
  unfavorable 
  food 
  conditions, 
  it 
  

   seems 
  very 
  important 
  to 
  determine 
  by 
  careful 
  experiment 
  the 
  sus- 
  

   ceptibility 
  to 
  gipsy-moth 
  attack 
  of 
  the 
  various 
  species 
  of 
  native 
  trees 
  

   in 
  New 
  England 
  forests 
  and 
  to 
  test 
  different 
  methods 
  of 
  thinning 
  

   woodlands 
  in 
  order 
  to 
  reduce 
  the 
  infestation 
  by 
  furnishing 
  unfavor- 
  

   able 
  food, 
  and 
  by 
  so 
  doing 
  to 
  prevent 
  the 
  area 
  thus 
  treated 
  from 
  

   becoming 
  so 
  badly 
  infested 
  as 
  to 
  enable 
  caterpillars 
  to 
  be 
  spread 
  from 
  

   it 
  by 
  the 
  wind. 
  These 
  experiments 
  are 
  now 
  under 
  way. 
  

  

  (3) 
  The 
  experiments 
  conducted 
  indicate 
  that 
  little 
  spread 
  by 
  the 
  

   wind 
  will 
  result 
  unless 
  badly 
  infested 
  areas 
  exist. 
  Inasmuch 
  as 
  the 
  

   principal 
  spread 
  over 
  a 
  wide 
  area 
  is 
  due 
  to 
  the 
  Avind, 
  more 
  attention 
  

   should 
  be 
  paid 
  to 
  the 
  proper 
  handling 
  of 
  bad 
  woodland 
  colonies 
  

   along 
  the 
  lines 
  already 
  indicated, 
  in 
  order 
  to 
  prevent 
  widespread 
  

   distribution. 
  From 
  the 
  experiments 
  conducted, 
  and 
  from 
  the 
  data 
  

   examined, 
  and 
  as 
  a 
  result 
  of 
  interviews 
  and 
  conversation 
  with 
  various 
  

   officials 
  and 
  parties 
  interested 
  in 
  moth 
  work, 
  it 
  appears 
  that 
  the 
  

   spread 
  of 
  the 
  gipsy 
  moth 
  at 
  the 
  present 
  time 
  by 
  automobiles 
  or 
  

   other 
  traffic 
  is 
  far 
  less 
  serious 
  than 
  heretofore. 
  Already 
  a 
  large 
  

   mileage 
  of 
  trees 
  along 
  trunk 
  roads 
  has 
  been 
  thinned 
  and 
  protected, 
  

   so 
  that 
  the 
  danger 
  has 
  been 
  largely 
  reduced 
  in 
  this 
  way. 
  Special 
  

   attention 
  has 
  been 
  given 
  to 
  many 
  roads 
  leading 
  to 
  and 
  from 
  summer 
  

   resorts 
  or 
  camping 
  places 
  where 
  automobile 
  traffic 
  is 
  heavy 
  during 
  

   the 
  summer, 
  and 
  as 
  a 
  result 
  of 
  this 
  work 
  and 
  of 
  the 
  scouting 
  which 
  

   has 
  been 
  carried 
  on 
  in 
  the 
  outlying 
  territory, 
  which 
  included 
  an 
  

   examination 
  of 
  the 
  trees 
  along 
  many 
  of 
  the 
  trunk 
  roads 
  in 
  unin- 
  

   fested 
  sections 
  of 
  the 
  State 
  as 
  well 
  as 
  an 
  inspection 
  of 
  places, 
  such 
  

   as 
  hotel 
  grounds, 
  where 
  touring 
  parties 
  would 
  be 
  likely 
  to 
  stop, 
  it 
  

   has 
  become 
  quite 
  evident 
  that 
  in 
  the 
  last 
  year 
  or 
  so 
  the 
  danger 
  of 
  

   infestation 
  by 
  means 
  of 
  automobiles 
  has 
  been 
  greatly 
  reduced. 
  This 
  

   would 
  indicate 
  the 
  desirability 
  of 
  reducing 
  the 
  thinning 
  operations 
  

   along 
  roadways, 
  except 
  on 
  those 
  where 
  the 
  automobile 
  traffic 
  is 
  the 
  

   heaviest 
  during 
  May 
  and 
  June. 
  

  

  (4) 
  The 
  work 
  which 
  has 
  to 
  do 
  with 
  the 
  determination 
  of 
  the 
  

   limits 
  of 
  spread 
  of 
  the 
  insect, 
  and 
  which 
  is 
  known 
  as 
  the 
  scouting, 
  

   is 
  of 
  great 
  importance. 
  This 
  is 
  being 
  carried 
  on 
  in 
  the 
  outside 
  in- 
  

   fested 
  towns 
  and 
  in 
  those 
  adjoining, 
  and 
  too 
  much 
  stress 
  can 
  not 
  be 
  

   laid 
  on 
  its 
  thorough 
  prosecution. 
  The 
  men 
  actively 
  engaged 
  in 
  it- 
  

   should 
  be 
  instructed 
  thoroughly 
  in 
  regard 
  to 
  the 
  best 
  methods 
  of 
  

   thinning 
  woodland 
  in 
  order 
  to 
  control 
  the 
  moth, 
  so 
  that 
  practical 
  

   advice 
  can 
  be 
  given 
  to 
  the 
  owners 
  of 
  forest 
  land 
  to 
  stimulate 
  them 
  to 
  

   take 
  proper 
  measures 
  for 
  protecting 
  their 
  property 
  before 
  the 
  infes- 
  

   tation 
  becomes 
  serious 
  enough 
  to 
  cause 
  severe 
  injury. 
  

  

  o 
  

  

  