CURRANT ELM 319 



CURRANT-WORM, or CURRANT and GOOSEBERRY SAWFLY ( Nematus 

 ventricosus) . Larva, about three-fourths inch long, yellow- 

 green, feeding on leaves of red and white varieties; two to four 

 bro.ods. 



Treatment. White hellebore, applied early. Arsenicals for 

 the early brood. Treatment should begin while the larvae are 

 on the lowermost leaves of the bushes. Before the leaves are 

 fully grown, the holes made by the worms may be seen. The 

 second brood is best destroyed by killing the first brood. 

 CURRANT MEASURING or SPAN-WORM (Cymatophora ribearia). 

 Larva somewhat over an inch long, with stripes and dotted with 

 yellow or black, feeding upon the leaves. 



Treatment. Hellebore, applied stronger than for currant- 

 worm. Arsenicals. Hand-picking. 

 FOUR-STRIPED PLANT-BUG. See p. 303. 



GREEN LEAF-HOPPER (Empoa albopictd). Small insect working 

 upon the under surface of currant and gooseberry leaves. Also 

 upon the apple. 



Remedies. Pyrethrum. Kerosene emulsion. Tobacco-dust. 

 Tobacco extracts. 

 Dahlia. FOUR-STRIPED PLANT-BUG. See -p. 303. 



CABBAGE LOOPER. See under CABBAGE, p. 311. 

 Egg-plant. POTATO-BEETLE. See under POTATO, p. 329. 

 Elm. CANKER-WORM. See under APPLE, p. 306. 

 ELM LEAF-BEETLE (Galerucella luteola). A small beetle, imported 

 from Europe, which causes great devastation in some of the eastern 

 states by eating the green matter from elm leaves, causing the 

 tree to appear as if scorched. 



Remedy. Arsenate of lead (ll pounds to 25 gallons). 

 ELM SAWFLY LEAF-MINER (Kaliosysphinga ulmi). A greenish white 

 larva feeding between the two layers of the leaf, causing large 

 blotches ; when abundant, the leaf dies and falls. They some- 

 times kill the trees in two or three years. 



Treatment. When the blotches are about one-third to one- 

 half inch in diameter, spray with "Black-leaf 40," tobacco extract, 

 1- gallon in 800 gallons of water, adding 4 pounds of whale-oil 

 soap to each 100 gallons. 

 WILLOW-WORM. See under WILLOW. 



