October, '15] CHILDS: CONTROL OF THE APPLE LEAF-ROLLER 



459 



to each 50 gallons of water. A large number of egg masses were exam- 

 ined at this time; none of the eggs were found to be hatching, the em- 

 bryonic development was far advanced. The date of this application 

 was April 3. 



A second or ''pink application" {i.e., at the time the flower clusters 

 were beginning to show pink) was made on April 14. The fungicide 

 employed was as in the first, lime-sulfur, used, however, in a more 

 dilute ratio, 1 to 27. The arsenate of lead was omitted in experiments 

 3, 4 and 6. The poison applied at this time in experiments 1,2 and 

 5 was in the same strengths as used in the delayed dormant spray 2, 

 4 and 6 pounds respectively. To determine the condition of the eggs, 

 a large series of egg masses were examined and it was found that 

 hatching was actively taking place, 58 per cent of the worms having 

 emerged. On the 20th of April, or four days later, no unhatched eggs 

 could be found. At this time a large portion of the foliage was still 

 well covered with the poison. From these observations it is clear 

 that material placed upon the trees during the time that the blossom 

 buds are showing pink is most advantageous with reference to the 

 emergence of the worms. 



Unfortunately, a series was not run in which a ''pink" spray only 

 was used; a series of this sort would undoubtedly show more clearly 

 the relative values of this application than can be shown with the data 

 at hand. 



At the time of the calyx application, May 1, a large majority of 

 the worms were found beneath the folded, web-covered leaves and 

 so located that their food was protected for the most part from mate- 

 rials that could be applied in the form of spray. In view of this fact, 

 a codling moth spray of 3 pounds to 50 gallons only was added to the 

 hme-sulfur 1 to 36 in all of the experiments For fear of codling 

 moth infestation, the check rows were sprayed at this time, also. The 

 data gathered from the counts made on the check rows, consequently, 

 hardly give accurate information relative to the losses that might 

 occur should all spraying be omitted. In looking over the experi- 

 ments after the calyx spray, many ailing worms were found and others 

 that were dead, all of which seems to indicate that, where available, 

 this strength is sufficient to destroy the worms. 



The fourth spray of the season or the second codling moth spray 

 was applied May 29. This consisted of arsenate of lead, 3 pounds to 

 50 gallons of water, plus the lime-sulfur 1 to 30. Fruit only received 

 attention at this time, all^f which were thoroughly covered. In early 

 June a great deal of fruit injury was noted taking place and in many 

 cases the small apples were found largely consumed. The worms in 

 folding and rolling the leaves often incorporate many of these little 



