INJURIOUS INSECTS OF 1903. 



59 



If twigs are very badly covered, cut off and burn. 

 Spray forcibly with kerosene emulsion (i-io) if leaves are on. But 

 when on nursery stock, see reference in article on Nursery Inspection. 



f. Small, green, active insects, ivhich cause leaves of nursery trees 

 to curl. Not to be confounded with the "Green Aphis." 

 Very destructive in Minnesota in 1903. 



LEAF HOPPERS. 



Fig. 34.— Currant leaf infested with a Leaf Hopper. Empoasca albopicta, Walsh. Lug- 

 ger. 



Remedies: This insect calls for a special apparatus designed to fill 

 the air about nursery trees with a fine spray of kerosene emulsion. One 

 nursery man claims to have obtained some relief by the use of dust 

 spraying. See text of this report, where this pest is fully discussed. 



