THE PLUMS OF NEW YORK. 135 



orchards in New York. It can be controlled by applications of lime and 

 sulphur. The bumble-flower beetle ' (Ettphoria inda Linnaeus) is 

 reported by Goff to be occasionally very injurious to plums in Wisconsin. 

 Remedies seem not to have been tried. The larvae of the cherry slug ' 

 {Selandria cerasi Peck) is not infrequently found doing damage to plum 

 foliage and occasionally the larvae of one or two other saw-flies feed on 

 the plum. These are all overcome by the use of arsenical sprays. At 

 least one of the curious insects know as " case-bearers " attacks the plums. 

 The troublesome one is the pistol case-bearer » {Coleophora malivorella 

 Riley), which is not often a pest but has sometimes done considerable 

 damage. Attempts to check this insect with the arsenical sprays have 

 usually proved successful. The plum tree is a host -plant of the hop aphis * 

 (Phorodon hnmuli Schrank). So much does this insect feed on the plum 

 that the destruction of plum trees in the vicinity of hop fields is recom- 

 mended to hop-growers by Riley. 



'Saunders, W. Insects Injurious to Fruits 159. 1883. 



'Ibid. 150-153. 1S83. 



'Lowe, V. H. The Pistol Case-bearer N. Y. Sta. Bui. 122:221-232. 1897. 



* Riley, C. V. Insect Life 1:133. 1889. 



