

140 Lessons in Fruit Growing. 



201. The rose beetle {MacrodacUjlus subspinosus) (Fig. 

 40) is sometimes very destructive to the foliage of the 

 grape in early summer. While it eats 

 the foliage voraciously, it is not readily 

 destroyed by poisons sprayed upon the 

 leaves. As the beetles are naturally slug- 

 gish, they are easily shaken from the vines fig. 4c. Rose beetle, 

 upon sheets in the early morning, as de- natural size. (After 

 scribed for the plum curculio (99). sauaders.) 



202. The grape-vine leaf-hopper {Eri/throueura vitis), 

 improperly known among grape growers as the " thrip " 

 (Fig. 41), is often injurious to the foliage of the grape late 

 in summer. It is a 



small insect of the ^^^^W^ A^kvo^i^^ vi 

 sucking class and C^^^^^SKb^^^^ Ji^i 

 works chiefly on the 

 lower side of the 

 leaves. The conse- 

 quent exhaustion of 



the sap causes yel- Fig. 41. Grape-vine leaf -hopper, enlarged; nat- 

 lowish or brownish ^^^al size indicated by short lines. (After Saunders.) 



spots on the upper side of the leaves, which later increase in 

 size, often covering the whole surface. In a severe attack, 

 the foliage over an entire vineyard may appear as if 

 scorched and may even drop, thus greatly retarding or pre- 

 venting the ripening of the fruit. 



This insect is rather difficult to control owing to its 

 quick movements. Thorough spraying with dilute kero- 

 sene, taking care to wet both sides of the leaves, will de- 

 stroy vast numbers of them. As they are attracted by 

 light, many may be destroyed by carrying lighted torches 

 through the vineyard, and disturbing the foliage to dis- 



