INSECTS INJURIOUS TO THE GRAPE 



459 



greatest numbers on the under side of the grape leaves. If this 

 is properly done, one application will give control. The time 

 for spraying, in the Northern States, will generally be during 

 the latter half of July. 



The Grape Leaf-folder * 



Very frequently grape leaves are found folded or rolled 

 together, with the interior surface more or less skeletonized, 



from which a slender 

 larva will wriggle out 

 and fall or hang sus- 

 pended on a silken 

 thread. The Grape 

 Leaf-folder occurs 

 throughout the United 

 States, and though 

 usually not injurious, 

 sometimes becomes 

 abundant enough to 

 do serious damage. 

 The moth is black with 



FIG. 383.-The grape leaf-folder (D fun wl te spotsonthewings, 



eralis Hiibn.): a, male moth and enlarged and bands across the 



antenna of same; 6, female moth; c, larva; a bdomen, as shown in 

 a, head and thoracic segments of same en- 7 



larged; e, pupa; /, tip of pupa enlarged; Fig. 383. The larva is 



(AfterMar " about an inch long, of 

 a greenish-white color, 

 with head and prothoracic shield light brown, and with brown 

 spots on the sides of the first two thoracic segments. 



Life History. "There are two broods each year in the more 

 Northern States and three or possibly more in the South. The 

 insect winters in the pupal stage in the folded and fallen leaves, 

 the moths appearing in the spring shortly after the foliage puts 

 out, and the eggs are placed in small patches here and there 

 on the vine. Upon hatching, the young larvae attack the foliage, 

 folding the leaves as stated. Mr. Johnson has observed that 

 the larvae of the first brood may attack bunches of grape blossoms 

 and young fruit in a way similar to the grape-berry moth In 



* Desmia funercdis Htibner. Family Pyralidce. See Quaintance, and 

 Quayle, 1. c., also J. F, Strauss, Bulletin 419, U. S. Dept. Agr. 



