SPRING PRACTICE IN ECONOMIC ZOOLOGY. 

 GENERAL PROGRAM FOR TREATMENT OF GRAPES. 



71 



CURRANT AND GOOSEBERRY INSECTS. 

 MARCH-APRIL. 



Nearly all, if not all, of these insects attack both fruits. 



San Jose Scale, Asf>id{otusj>erniciosus. Spray with lime-sulfur. 



Scurfy Scale, CMonaspis furfurus. 



Oy&ter Sb.ei.1. ScAus, Le:ptdosap/ies ulmt. 



Imported Currant Borer, Sesta {Aeffcria) tipuliformis. See 

 Winter Manual. 



Native Currant Borer, Psenocerus supernoiatus. See Winter 

 Manual. 



The Currant Span Worm, Cymatophora ribearia, appears as a 

 small measuring worm just after the leaves expand. When full 

 grown, it is about one inch long, color whitish, with broad yellow 

 stripes on back and sides, each segment being dotted with some 

 black spots. If disturbed, the caterpillar drops toward the ground 

 by means of a web spun from its mouth. Therefore, the bushes 

 may be jarred and the,suspended worms collected and destroyed. 

 Arsenate of lead, applied while the fruit is very young, is safe and 

 effective. For late treatment, dust with fresh pyrethrum mixed 



