l82 



Bulletin 252. 



These small, slimy, slug-like, dark green larvae (Fig. 154) 

 Pear slug. skeletonize the leaves in June, and a second brood appears in 



August. Spray thoroughly 

 with I lb. Paris green, or 4 lbs. arsenate of 

 lead, in 100 gals, of water. 



Plant-lice. 



Fig. 155. Grape rooi-zvonit. 



NURSERY STOCK. 



Spray thoroughly or dip the 



tips in kerosene emulsion, 

 diluted with 6 parts of water, or whale-oil 

 soap, I lb. in 5 gals, of water. 



After the trees are dug, 

 San Jose scale, fumigate with hydrocyanic 



;;cid gas, using i ounce of 

 potassium cyanide for every 100 cubic feet of 

 space. Continue the fumigation from one-half 

 to three-quarters of an hour. Do not fumigate 

 the trees when they are wet, since the presence 

 of moisture renders them liable to injury. 



GRAPE. 



The small, shining blue 

 Flea-beetle or beetles appear in early spring 

 "Steely-beetle." ^"d eat into the opening 



buds. The brown larvae feed on the leaves in May and June. 

 When buds begin to swell cover them thoroughly with arsenate of lead, 8 lbs. in 

 100 gals, of water, or when beetles appear, hand-pick them into a pan containing 

 a little kerosene. To kill the larvae on the leaves from May 15th, to July ist, add 

 I lb. Paris green or 4 lbs. ar- 

 senate of lead to every iod gals. 

 of Bordeaux mixture. See under 

 BLACK-ROT. Cornell Bulletin 157. 



The small 

 Root-worm, white grubs 



(Fig. I S 5 ) 

 feed upon the roots, often kill- 

 ing the vines in a few years. 

 The adults are small grayish- 

 brown beetles that eat peculiar 

 chain-like holes in the leaves 

 during July and August. Culti- 

 vate thoroughly in June especi- 

 ally close around the vines to 

 kill tlie pupae in the soil. Spray 

 thoroughly the latter part of 

 June with arsenate of lead, 6 

 lbs. in 100 gals, of water, to kill 

 the beetles. Repeat the applica- 

 tion in a week or ten days. Cor- 

 nell Bulletins 208 and 224, 235. Fig. 156. Currant-worms. 



