﻿34 
  

  

  CIRCULAR 
  2 
  7 
  0, 
  U. 
  S. 
  DEPARTMENT 
  OF 
  AGRICULTURE 
  

  

  CONTROL 
  

  

  Not 
  much 
  is 
  known 
  about 
  con- 
  

   trolling 
  tlie 
  pandemis, 
  but 
  a 
  small 
  

   quantity 
  of 
  10-percent 
  DDT 
  dust, 
  

   placed 
  about 
  the 
  base 
  of 
  the 
  tree, 
  

   as 
  recommended 
  for 
  climbing 
  cut- 
  

   ^Yorms 
  (p. 
  50), 
  might 
  prevent 
  the 
  

   larvae 
  from 
  o:ettino: 
  into 
  the 
  trees 
  

  

  causes 
  scars 
  and 
  deformities 
  on 
  

   the 
  mature 
  fruit. 
  The 
  beetles 
  also 
  

   feed 
  on 
  the 
  stems, 
  causing 
  some 
  

   of 
  the 
  fruit 
  to 
  drop, 
  and 
  on 
  the 
  

   buds, 
  blossoms, 
  and 
  leaves. 
  

  

  

  Figure 
  39. 
  — 
  A, 
  Egg 
  masses 
  of 
  the 
  pan- 
  

   demis 
  moth; 
  B, 
  cherries 
  injured 
  by 
  pan- 
  

   demis 
  worms. 
  

  

  in 
  the 
  spring. 
  Sprays 
  or 
  dusts 
  of 
  

   lead 
  arsenate, 
  DDT, 
  or 
  parathion 
  

   (see 
  Cautions, 
  pp. 
  58 
  and 
  59), 
  if 
  

   thoroughly 
  applied, 
  should 
  also 
  be 
  

   effective 
  against 
  the 
  young 
  larvae. 
  

   They 
  should 
  be 
  used 
  in 
  i^pril 
  or 
  

   May, 
  as 
  soon 
  as 
  worms 
  are 
  found 
  

   in 
  the 
  trees. 
  

  

  Syneta 
  Leaf 
  Beetle 
  

  

  The 
  syneta 
  leaf 
  beetle 
  is 
  a 
  com- 
  

   mon 
  pest 
  of 
  cherry 
  west 
  of 
  the 
  

   Cascade 
  Mountains. 
  Apparently 
  

   it 
  is 
  a 
  native 
  insect 
  that 
  has 
  found 
  

   congenial 
  living 
  conditions 
  in 
  cul- 
  

   tivated 
  orchards. 
  The 
  beetles 
  eat 
  

   the 
  skin 
  and 
  flesh 
  of 
  the 
  immature 
  

   fruit 
  (fig. 
  40). 
  This 
  injury 
  

  

  Figure 
  40. 
  — 
  Immature 
  cherries 
  injured 
  

   by 
  syneta 
  leaf 
  beetles. 
  

  

  LIFE 
  HISTORY 
  

  

  The 
  beetles 
  emerge 
  from 
  the 
  

   ground 
  just 
  before 
  the 
  trees 
  begin 
  

   to 
  bloom. 
  They 
  are 
  about 
  one- 
  

   fourth 
  inch 
  long, 
  and 
  light 
  gray, 
  

   dirty 
  white, 
  or 
  yellowish 
  (fig. 
  41) 
  . 
  

  

  Figure 
  41. 
  — 
  Syneta 
  leaf 
  beetles, 
  male 
  and 
  

   female. 
  Enlarged. 
  

  

  They 
  begin 
  feeding 
  in 
  the 
  trees 
  at 
  

   once 
  and 
  may 
  be 
  found 
  in 
  the 
  

   orchards 
  for 
  about 
  2 
  months. 
  

   They 
  remain 
  between 
  the 
  buds 
  or 
  

   among 
  the 
  foliage 
  but 
  fly 
  out 
  in 
  

  

  