REPORT OF COMMITTEE ON PUBLICATION 



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seen at the end of the channel. It continues to feed upon the pulp of the 

 fruit, and when it reaches the seeds, eats out their interior. As it matures, 

 it becomes darker, being either of an olive green or dark brown color, with a 

 honey-yellow head, and if one grape is not sufficient, it fastens the already 

 ruined grape to an adjoining one by means of silken threads, and proceeds 

 to burrow in it as it did in the first. When full grown, it leaves the grape 

 and forms its cocoon on the leaves of the vine. This operation is performed 

 in a manner essentially characteristic; the worms cut out a clean oval flap, 

 leaving it hinged on one side, and, rolling this flap over, fastens it to the 

 leaf, thus forming for itself a cozy little house which it lines on the inside 

 with silk. In this cocoon within two days it changes to a chrysalis of a honey- 

 yellow color of a green shade on the abdomen." 



Fig. 6. Wormy berries in July. 



The individuals of the second brood of larvae have a tendency to leave 

 the berries in which they are working and attack other berries which are 

 close to, or touching the berry in which the worm has been feeding, leaving 

 each berry as soon as it begins to ferment, for a sound berry. It spins a 

 silken covering between the berries, attaching each newly attacked berry to 

 the preceding one in which it has fed. In this way, as many as five of six 

 berries may be destroyed by one worm. The juice in the injured berries 

 evaporates and frequently a bunch of grapes has half or more of the grapes 

 dried out with only the purple or black dried skins remaining and looking 

 almost like sound grapes. In many vineyards, I have found fully half of the 

 berries in a cluster of grapes, which were only shells. 



Many larvae of this brood are not mature until late in October and they 

 are often active after we have had some severe frosts. The earlier maturing 



