Insect Pests and Plant Diseases. 



183 



These small yellowish leaf-hoppers, erroneously called " thrips " 

 Leaf-hopper, suck the sap from the underside of the leaves causing them to 



turn brown and dry up. Spray the underside of the leaves very 

 tlioroughly with whale-oil soap, i lb. in 10 gals, of water, about July ist, to 

 kill the young leaf-hoppers. Repeat the application in a week or ten days. Cor- 

 nell Bulletin 215. 



The ungainly, long-legged, grayish beetles occur in sandy 



regions and often swarm into vineyards and destroy the blos- 

 Kose-Ciiaier. joms and foliage. Spra\' thoroughly with arsenate of lead, 10 



lbs. in 100 gals, of water. Repeat application if necessary. 



RASPBERRY, BLACKBERRY AND DEWBERRY. 



The greenish, spiny larvae 



Saw-fly. ft^cd on the tender leaves in 



spring. Spray with Paris 

 green or arsenate of lead, or apply hellebore. 



The larva is a grub that bur- 

 Cane-borer. rows down through the canes 

 causing them to die. In lay- 

 ing her eggs, the adult beetle girdles the tip of 

 tlie cane with a ring of punctures causing it 

 to wither and droop. In midsummer cut off 

 and destroy the drooping tips. 



CURRANT AND GOOSEBERRY. 



In the spring the small green. 

 Currant-worm, black-spotted larvae (Fig. 156; 

 feed on the foliage, beginning 

 their work on the lower leaves. A second 

 brood occurs in early summer. When worms first 

 appear, spray with i lb. Paris green or 4 lbs. 

 arsenate of lead in 100 gals, of water. Ordi- 

 narily the poison should be combined with Bor- 

 deaux. See CURRANT LEAF-SPOT. After fruit is Fig. 157. Rose aphis or plant- 

 half grown use hellebore. ouse. 



ROSE. 

 The green plant-lice (Fig. 157) usually work on the buds, and 

 Aphis and the yellow leaf-hoppers feed on the leaves. Spray, whenever 

 leaf-hopper, necessar}-, with kerosene emul- 

 sion, diluted with 6 parts of 

 water, or whale-oil or any good soap, i lb. in 5 or 

 6 gals, of water. 



Rose-chafer. See under grape. 

 Rose-slug. See under pear slug. 



STRAWBERRY. 



These large curved white grubs 



White grubs. (Fig. 15S) are the larvae of 



the common June beetles. 



Fig. 158. White grub. 



