8o INSECTS OF ECONOMIC IMPORTANCE 



appears; the apbids multiply and cause the foliage 

 to curl and pucker ; in the third generation winged 

 females migrate to motherwort (Leomirus) and 

 hedgenettle (SfacJiys) but some of the aphids may 

 remain on the currants ; in late October the winged 

 migrants return to the currants and produce males 

 and egg-laying females, the latter depositing the 

 eggs. 



Control — Spray before leaves are badly curled 

 with nicotine sulphate, i pint to lOO gallons of wa- 

 ter with 4 pounds of soap added ; spray the under- 

 sides of the leaves. 



The FOUR-LINED LEAF-BUG ^^ (PcccHocapsHS Uiica- 



tiis) 

 Order — Hemiptera 



This is a common bug with many food plants but 

 is often very injurious to the young foliage of cur- 

 rant and gooselDcrry; attacked leaves turn brown, 

 curl up and become brittle. 



The eggs are deposited in slits cut lengthwise in 

 the stems of the plants; the}^ pass the winter in 

 these situations and hatch early in the spring; the 

 nymphs have shining vermilion red bodies; they 

 molt five times and become full-grown in 17 to 20 

 days ; the nymphs feed on the tenderest young foli- 

 age, causing brownish depressed spots to appear on 

 the leaves; the adult bugs appear about the middle 

 of June ; lay their eggs, are active for about a month 

 and then disappear. 



Control — Spray the nymphs with nicotine sul- 

 phate, three-fourths pint to 100 gallons of water; 

 cut off tips of stems containing eggs and burn them. 



1^ Slingerland— Cornell Univ. Expt. Stat., Bull. 58. 



