484 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



arc usually forced out of the slit somewhat, so that about one-half 

 ... of the white portion of the egg projects from the slit." 

 Most of the slits are made two or three inches, rarely over six 

 inches, below the tender tips. 



Control. Experiments indicate that the nymphs may be 

 killed by spraying them with kerosene emulsion containing 10 

 per cent kerosene. Tobacco extracts should also be tried. The 



FIG. 348. Currant leaves killed by the four-lined leaf-bug. (After Slinger- 



land.) 



adults are not susceptible to this treatment, however. Both 

 nymphs and adults will drop from the foliage when disturbed, 

 and Professor Slingerland has suggested that they might be j arred 

 into a pan of kerosene. By drawing pans, such as constructed 

 for combating the pea-aphis (p. 326), between the rows and 

 jarring the bugs into them, many might be destroyed. As the 

 eggs are readily recognized, the tips containing them should be 

 cut off and destroyed during the winter. 



The Currant-aphis * 



The young foliage of currants, and sometimes of gooseber- 

 ries, is often found curled up in late spring with many bladder- 



* Myzus ribis Linn. Family Aphididae. See V. H. Lowe, Bulletin 139, 

 N. Y. Agr. Exp. Sta., p. 660. Another species, Rhopalosiphum ribis Linn., 

 is also common on currant and is described and figured by Mr. Lowe. 



