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BULLETIN 1032, U. S. DEPARTMENT OF AGEICULTUEE. 



ing into the blossoms or berries, as described above; later on, both 

 large and small larvae may attack the berries, eating into them 

 where the berries touch one another or the leaves or an adjoining 

 upright. (See fig. 5.) 



The second generation of worms makes its appearance in consid- 

 erable numbers the latter part of July. These larvae not only feed 

 upon the foliage, like those of the first generation, but they also web 

 it up more, feed longer, and move from place to place much oftener 

 than do the larvae of the first generation. Especially on bogs 



Fig. 4. — The blackhead tireworm. Early work of the larva? in the tips : u. Entire new 

 tip destroyed : h, showing how the tip leaves are webbed together ; c. an uninjured 

 upright. 



making little new growth they may extend their feeding to the old 

 foliage, including many of the old uprights in. their webs. In 

 addition, many of them may also feed extensively throughout the 

 remainder of the season on berries of all sizes. It does not seem to 

 make much difference whether the berries are webbed up or not; in 

 fact, the majority of the berries attacked are not webbed up at all. 

 (See fig. 5.) The injury done by the second generation of larvae is, 

 therefore, very striking. The third generation of worms is not very 

 distinct from the second and not quite so numerous; but occurring 



