THE GRAPE-VINE PLUME. 503 



hatch, when the larvae eat the leaves until they 

 have acqinred sufficient growth, when, with the 

 approach of winter, they take up their abode upon 

 the stem ( Westwood). 



§ X. — DISEASES OF THE VINE. 



I. Diseases affecting the Foliage. 1. Insects. 

 ( 1 ) The Grape-vine Plume — Pterophorus j^eriscelidac- 

 tylus. The larvae are about one-half an inch in 

 length, having sixteen feet, and fourteen segments to 

 their bodies. They are pale green in color, " and have 

 two rows of elevated white spots along the back, and 

 one on each side, from all of which little white bris- 

 tles stand out." These insects become moths the 

 latter end of June or first of July ; and very probably 

 give birth to another generation the same season. 

 They may be easily detected upon the vine when in 

 the larva state, for they draw together two or three 

 leaves by means of threads. When this is observed, 

 the leaves should be cut off very carefully, so as not 

 to disturb the worm, else he will escape'; and the 

 whole should be burned, or trampled under foot, so 

 as to destroy the insect (Fitch). 



(2) Saiv-fy of the Vine — Selandria vitis. The 

 color of this fly is generally black, except the under 

 part of the thorax, which is red, and also the fore 

 legs and under part of the other legs, which are 

 pale yellow. The wings are of a smoky color, with 



