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MASS. EXPERIMENT STATION BULLETIN 233 



In Massachusetts, two sprays, the calyx (No. 3) and a cover, or post- 

 calyx (No. 4), are usually necessary to control the codling moth effectively, 

 while a later spray (No. 7) is advisable in seasons when this pest is unusually 

 abundant. 



Figure 2. Dates of Hatching of Codling Motli Larvae, Amherst, Mass. 



Small circle indicates approximate time calyx spray was applied. 



Small squares show approximate time to apply cover sprays to control codling moth 

 most effectively according to the seasonal liistory of the insect in 1923, 1924, 1925. 



The above dates may not necessarily coincide with those recommended in the 

 spray schedule, which are based on average conditions and are also influenced 

 by other pests. 



