321 
Annual  Report  for  1910  of  the  Zoologist. 
another  season  will  throw  additional  light  upon  some  points  in 
its  habits  which  are  at  present  obscure. 
Forest  Tree  Pests. 
The  pests  concerning  which  advice  was  asked  included 
several  insects  injurious  to  forest  trees.  Among  wood  and 
bark-boring  insects  cases  of  attack  by  goat-moth,  poplar  beetle 
(< Saperda ),  and  elm-bark  beetle  were  reported.  Cockchafer 
grubs  were  in  some  instances  injuring  the  roots  of  young  trees 
in  nurseries.  Several  species  of  aphidse  were  complained  of — 
the  larch  chermes  most  frequently. 
Attacks  of  pine  saw-fly  were  reported,  but  no  examples  of 
the  new  larch  saw-fly  were  received.  Preparations  hail  been 
made  for  breeding  out  a number  of  the  pupae  for  the  purpose 
of  investigating  the  parasites  which  prey  upon  them,  but  in 
the  absence  of  material  this  investigation  had  to  be  postponed. 
As  usual,  the  beech  coccus  was  a frequent  subject  of  complaint, 
and  the  giant  sirex  was  one  of  the  favourite  insects  sent  for 
identification.  One  of  the  commonest  and  most  annoying 
pine  tree  pests  in  nurseries  and  gardens  seems  to  be  the  pine-sboot 
tortrix.  It  lays  its  eggs  in  the  leading  shoots  of  young  pines, 
and  the  caterpillars  destroy  the  shoots  and  distort  the  growth 
of  the  tree.  There  is  nothing  to  be  done  except  to  pick  off 
and  burn  the  infested  shoots,  but  it  should  be  remembered  that 
the  proper  time  for  this  operation  is  June.  In  July  the  moths 
come  out,  and  if  the  destruction  of  the  injured  buds  is  to  be 
of  any  benefit  it  must  of  course  be  done  before  the  date  of 
their  emergence. 
Cecil  Warburton. 
School  of  Agriculture, 
Cambridge. 
VOL.  71. 
Y 
