I40 



Bulletin 142, 



the calyx cavity. In the case of the pears, however, the calyx lobes drew 

 together but very little. How this fact may afifect the efifectiveness of the 

 poison spray for the insect onpears will be discussed later. On most vari- 

 eties of apples we found the calyx cavity closed within two weeks after the 

 petals fell. Mr. Card found it closed in about ten days in Nebraska in 

 1897, but in the case of some varieties of apples it never closed. Munson 

 records ,that the calyx lobes on the Baldwin closed in about two weeks. 

 The time doubtless varies a few days with different varieties. 



146. — Almost too late to spray apples effectively. lYote that the calyx lobes are 

 drawn nearly together on the two apples^ while on the pear in the center^ the 

 calyx cavity is open. 



Now, of what importance to the fruit-grower are these facts regard- 

 ing the closing of the calyx lobes ? Anticipating a little, it means that 

 the closing of the calyx lobes is the signal that it is too late to get in your 

 most effective blow against the codling-?noth with a poison spi-ay. 



Returning to our observations upon the insect, we found no eggs 

 until the calyx lobes had closed, or nearly so, as shown at a and b in 

 figure 131. And as the worms would not hatch until a week later, we 

 were in a quandary to explain how a Paris green spray, applied accord- 

 ing to the prescribed ride of " just after the blossoms have fallen," could 

 possibly affect a worm appearing on the apple ten days or two weeks 



