“ t
, Hessian Fly Experiments. 239   V
‘ ,1 Yet it would be unsafe to assert that an isolated field of late
L planted wheat will never be severely injured. Though small
  and fragile, the adult Hessian fly shows a surprising activity, 4
 = and, aided by winds, is no doubt at times disseminated long
: distances from the fields in which it emerges. As an example
it may be mentioned that a small isolated planting on the Ex-
t periment Farm became infested in the spring to the extent of  
, 20 per cent. The infested wheat nearest to this planting must ·,`
i have been a quarter of a mile away, but it is possible that the N  
adults that visited it came from flaxseeds in straw at a barn   _
near by. '    
Dusting and Spraying for Hessian Fly. fg
· It is sometimes claimed that applications of lime, Paris  
' green and other materials have a beneficial effect in deter- if
ring the fly from placing its eggs on wheat. The use of lime
· dusted on the plants has been especially recommended. On
September 22, 1902, in addition to an untreated plot, two ad-
t  ditional plots were sown. Subsequently one—half of one of the `
_ plots was dusted with air-slaked lime, another was sprayed Q
with lime and Paris green in water, a thirdiwith Bordeaux mix— i
ture, and a fourth with coal-oil emulsion. Each half plot {
contained 144 acre.
‘ Dustring with Lin2e.—The first application was made Octo-
· ber 4, when two pounds of lime were used. On October 13  
two pounds more were sown over the plants. The third and `  
last application was made October 20, when two pounds were ‘ _
used.  
Twenty-five per cent, of the wheat was found to be infested  
sk with fly when it was examined November 28.   il
  Lime and Paris Green.-Tlie spray used consisted of one n   1
Q pound of Paris green, two pounds of lime and 140 gallons of  
  water. One and a half gallons of this mixture were used on {
  each of the dates October -1, 13 and 20.
  Thirty-one per cent. was infested on November 21.
  Bm·¢Zean.r J1[I·.l`l(I{7'P._‘Th€ mixture used consisted of six and
Q a half pounds of bluestone. three and a half of lime, and 32
T I
T " ·‘t.  fw     aa .