1148 THE FRUIT INDUSTRY ix XEW YORK STATE 



a tadpole. They feed on the upper surface of the leaf, eating only 

 the epidermis and leaving the skeleton of veins and the lower epi- 

 dermis to turn brown and wither. In severe cases the tree is de- 

 foliated and the crop fails to mature. A second brood of the flies 

 appear in late July and early August and lay eggs for another 

 brood of slugs. 



Control 



The pear slug is readily controlled by spraying the trees with 

 arsenate of lead, 4 pounds in 100 gallons of water. The applica- 

 tion should be made about the time the eggs are hatching. 



SAN JOSE SCALE 



While the sour cherry is nearly immune to the San Jose scale 

 (Aspidiotus perniciosus) , the sweet varieties often become badly 



infested. The treatment for 

 scale on sweet cherries is the 

 same as that commonly prac- 

 ticed for its control on other 

 orchard trees. Good results 

 may be obtained by thorough 

 spraying with lime-sulphur (32 

 degrees Baume), 1 gallon in 8 

 gallons of water. 



THE RED CHERRY LEAF-BEETLE 



From time to time since 

 1894 local outbreaks of this 

 brick-red leaf-beetle ( Galeru- 

 celld c&W'Collis) have occurred 

 in the northern states from 

 Michigan to Xew Hampshire, 

 In May and early June of 



FIG. 373.- LEAVES RIDDLED BY 1915 the teetles were fmmd in 

 RED CHERRY LEAF-BEETLE great numbers on their food- 



(Photo by Matheson.) n , 



plant, the wild red cnerry 



(Prunus pennsylvanica] , in southwestern New York. About the 

 same time they swarmed in great numbers into the peach, plum, 



