594 



Bulletin 283. 



the axils of the leaves and fruit early in the season. They develop into minute, 

 cicada-like jumping-lice. The young psyllas secrete a large quantity of honey- 

 dew in which a peculiar black fungus grows, giving the bark a characteristic 

 sooty appearance. There may be four broods annually and the trees are often 

 seriously injured. After the blossoms fall, spray with kerosene emulsion, diluted 

 with 6 parts of water, or whale-oil soap, i lb. in 4 or 5 gals, of water, or with one 

 of the tobacco extracts. Repeat the application at intervals of 3 to 7 days 

 until the insects are under 

 control. Cornell Bulletin 108. 



See under 



Leaf blister- apple. On 



mite. pears, the 



lime-sulfur 

 wash has also been found 

 effective. 



See under 



APPLE. 



See under 

 APPLE. 

 These 

 small, sli- 

 my, slug- 

 like, dark green larvae (Fig. 



202) skeletonize the leaves in June. A second brood appears in August. Spray 

 thoroughly with i lb. Paris green or 4 lbs. arsenate of lead in 100 gals, of water. 



San Jos^ scale. 

 Codling-moth. 



Pear slug. 



Fig. 202. Pear slugs skeletonizing the leaf. 



PLUM AND PRUNE. 



The adult is a small snout -beetle (Fig. 203) that inserts its eggs 



Plum under the skin of the fruit and then makes a characteristic 



Curculio. crescent-shaped cut beneath it. The 



grub feeds within the fruit and 

 causes it to drop. When full grown it enters the 

 ground, changes in late summer to the beetle, which 

 finally goes into hibernation in sheltered places. Spray 

 just after blossoms fall with arsenate of lead, 6 to 8 lbs. 

 in 100 gals, of water, and repeat the application in 

 about a week. After the fruit has set, jar the trees 



daily over a sheet or curculio-catcher and destroy the Fig. 203. Beetle of plum 

 beetles. Cornell Bulletin 235. curculio. Enlarged. 



POTATO. 



The yellow striped beetle emerges from hibernation in the spring 



Colorado and lays masses of orange eggs on the underside of the leaves. 



potato-beetle. The larvae are known as "slugs" and "soft-shells" and cause 



most of the injury to the vines. Spray with Paris green 2 lbs. 



or arsenate of lead 4 lbs. in 100 gals, of water or arsenite of soda combined with 



Bordeaux mixture. It may sometimes be necessary to use a greater strength of 



the poison, particularly on the older "slugs." 



