424 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



eggs about a week after they first appear. The female is furnished 

 with a strong ovipositor with which she inserts the eggs in slits cut 

 lengthwise into the stems of the plants extending nearly half way 

 through the pith. A half-dozen or more eggs are packed together 

 in the small slit, which may be one-eighth inch long. The indi- 

 vidual egg is about one-sixteenth inch long, light yellow, and shaped 

 as in Fig. 355e, with the upper third capped by a white, finely 

 striated portion. "With the growth of the surrounding tissue of 

 the stem, the eggs are usually forced out of the slit somewhat, so 

 that about one-half ... of the white portion of the egg pro- 

 jects 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 







FIG. 357. Currant leaves killed by the four-lined leaf-bug. (After Slinger- 



land.) 



killed by spraying them with kerosene emulsion containing 10 

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

 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 jarred 

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

 for combating the pea-aphis, 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. 



