CONTROL OF (CODLING MOTH IN ARID REGIONS, 



71 



A large mimhor of si)rayinfi: tosts have been made, and by using 

 Paris green without lime the location of each grain of poison could 

 be readily made out Avith a strong hand lens. 



A fine mist spray applied only to the point of drij^ping was first 

 tried. This left grains of poison well distributed over the inside of 

 the calyx lobes and on the upper surface of the stamens when applied 

 to the o])en calyx, as shown in subfigure 1. AA'hen this sj)ray was con- 

 tinued until the drops ran together, the greater amount of the poison 

 was deposited in a ring around the base of the stamens. When ap- 

 plied to the closing calyx of subfigure 2, it simply deposited a few 

 grains in the outer ])art of the throat and on the tops of the stamens 

 and i)istils. In the hinulreds of cases examined there were but few in 

 which there was any j)ois()n to be seen in the lower cuj) and (lien only 



Fig. 4. — The condition of tlie calyx cup of tlie apple in relation to spraying for tlie codling' 

 moth : Fiy. 1 — A calyx cup, five days after tlie petals fell, split open to show two cavi- 

 ties ; /(/, the roof of stamens as seen from above. Fi(j. 2 — A calyx cup two weeks after 

 blossoming, sliowing the calyx lobes above: 2«. the stamens from above, to show spaces. 

 Fiy. S — The relation of the two cavities in a nearly grown apple ; Su, stamens from 

 above. 



in small amoimts. The fine, mist-like drops did not seem to be al)le 

 to force their way through the fleshy stamens in the open calyx nor 

 through the hairy mass in the throat of the closing calyx. Simpson 

 states that in his experiments he *■ was unal)le at any time to distin- 

 guish any particle of spray inside the tube." and he lays especial 

 stress on the fine, mist-like spray. Slingerland states that the spray 



