124 INSECTS AFFECTING THE GRAPE. 



grass, where they remain till the following spring, 

 when they emerge from their winter quarters, deposit 

 their eggs upon the leaves of the vine, and perish." 



Remedies. — If the vines are dusted early in the 

 season, before the leaf-hoppers have acquired wings, 

 with pyrethrum (insect powder) or tobacco dust, by 

 means of some apparatus like Leggett's powder gun, 

 the pests will be destroyed by the million. This 

 appears to be the most promising remedy for them. 

 Some vineyardists catch them on a sheet, saturated 

 with kerosene or covered with tar, the sheet being 

 stretched on a frame which is carried along one side 

 of the row, while somebody goes along the other 

 side of the vines and frightens the insects toward it. 



The Grape-vine Leaf-roller. 



Desmia maculalis. 

 This is a slender, somewhat flattened, yellowish- 

 green caterpillar, measuring when full grown about 

 three-quarters of an inch, that rolls the leaves of 

 grape-vines, fastening the sides together by silken 

 threads. It hatches from an egg laid on the leaf by 

 a pretty little dark-brown moth, expanding nearly 

 an inch, and having several conspicuous white spots 

 on its wings. The larva usually pupates within the 

 folded leaf. There are two broods each season, the 

 first brood of larva? pupating about midsummer, to 

 emerge as moths shortly afterwards, and the second 

 pupating in autumn and hibernating as chrysalids. 



