THE LEPIDOPTERA 



241 



(Fig. 238) and thus limits the effective spray period to that time. For- 

 tunately, different varieties of apples do not bloom at quite the same time, 

 so that spraying where large orchards are involved should begin with those 



FIG. 237. Apple blossoms in proper condition for receiving the calyx spray. Adult 

 Codling Moth, natural size, above. (From Felt, 27th. Rept. N. Y. Slate Ent., 1911.) 



trees which lose their petals first, taking the later-blooming varieties 

 afterwards. When the sepals close this helps to hold the poison in the 

 cup ready to be consumed whenever the caterpillars reach it. Where 



FIG. 238. Small apple showing calyx lobes practically closed. Too late for successful 

 spraying. (Modified from Cornell Agr. Exp. Sta. Bull. 142.) 



pears are to be sprayed, their treatment can be postponed until the work 

 on the apples has been completed, as in the pear the calyx lobes do not 



16 



