REPORT OF CRANBERRY SUBSTATION FOR 1915. 37 



A comparison of the figures given in the table shows that there was not 

 a single bog, a record of the 1914 examination of which was kept, that, 

 after being resanded, did not show a tremendous drop in the amount of 

 tip worm infestation. On the other hand, practically only one bog that 

 was not resanded between September, 1914, and May, 1915, failed this 

 year to have an infestation equal to or greater than that of 1914. The single 

 exception (No. 8 in the table) was so heavily frosted late in May that its 

 prospective crop was entirely destroyed and most of its tips killed back. 

 In the opinion of the writer its exceptional condition as regards tip worm 

 infestation was an effect of the frost injury, most of the maggots of an 

 early brood perhaps having been starved to death by the drying up of 

 the tips killed by the frost, this conclusion concerning the effect of frost 

 being in line with those advanced in last year's report of the substation 

 (page 106). 



The examination this season of many other bogs besides those listed in 

 the table produced abundant corroborative e\'idence of the marked effect 

 of resanding on the subsequent amount of infestation by this insect. 



In December, uprights from many locations on four different bogs were 

 examined to determine the amount of recovery from injury done by this 

 insect as indicated by the development of buds large enough to promise 

 the production of blossoms therefrom the following season. The results 

 of these examinations are shown in Table 18. The buds in the axils of 

 the leaves, as well as those at the tips of the uprights, were included in 

 making the counts. 



Table 18. — Winter Bud Formation subsequent to Tip Worm Injunj. 



It will be seen from the table that, while a much larger percentage of 

 uninjured tips developed buds, there was, nevertheless, a sufficient recovery 

 among those that were injured to cause a considerable bud production. 

 In view of this and of the fact that the effect of light or heavy cropping is 

 carried over in the vines from one season to another, it is very difficult to 

 say, with any degree of accuracy, how great the loss caused by this insect 

 one year with another really is. 



