COKTBOL OF CODLING MOTH IX AI'.ID BEGIO 



71 



A large number of spraying tests have been made, and by using 



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

 be readily made out with a strong hand lens. 



A fine mist spray applied only to the point of dripping 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 open calyx, as shown in subfigure 1. When this -pray 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 ± it simply deposited a few- 

 grain- in the outer part of the throat and on the tops of the stamens 

 and pistils. In the hundred- of cases examined there were but few in 

 which there was any poison to be >een in the lower cup and then only 



PlG. 4. — The condition of the calyx cup of the apple in relation to spraying for the codling 

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

 ties; la. the roof of stamens as seen from above. Fig. 2 \ calyx cup two weeks after 

 blossoming, showing the calyx lobes above; la, the stamens from above, to show spares. 

 Fig. 3 — The relation of the two cavities in a nearly grown apple : .:■/. stamens from 

 above. 



in small amounts. The fine, mist-like drops did not seem to be able 

 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 hi- experiment- he " was unable at any time to distin- 

 guish any particle of spray inside the tube,' 1 and he lay- especial 

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



