Insect Pests and Plant Diseases. 



i8i 



When the adults appear jar them from the tree onto sheets or curculio-catchers 

 and destroy them. To determine when they appear jar a few trees daily, begin- 

 ning the latter part of May. Cornell Bulletin 148. 

 San Jose scale. Sec under APPLE. 

 Round-headed apple-tree borer. See under apple. 



Peach borer. 



PEACH AND APRICOT 



The adult is a clear-wing 

 moth. The larva burrows 

 just under the bark near 

 or beneath the surface of 

 the ground ; its presence is indicated by a 

 gummy mass at the base of the tree (Fig. 

 153). Dig out the borers in June and 

 mound up the trees. At the same time, 

 spply gas-tar or coal-tar to the trunk from 

 the roots up to a foot or more above the 

 surface of the ground. Cornell Bulletins 

 176 and 192. 



Plum curculio. See under plum. 

 San Jose scale. See under apple. 



Pear psylla. 



Fig. 153. Peach borer. 



PEAR. 



Tliese minute, yellowish, 



sects are often found 



flat-bodied, sucking in- 

 working in 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. Repeat the applica- 

 tion at intervals of from 3 

 to 7 days until the insects 

 are under control. Cornell 

 Bulletin loS. 



See under 



Leaf blister- apple. On 



mite. pears, the 



lime-sul- 

 phur wash has also been 

 found efifective. 



See under 

 San Jose scale. ^pp^E. 



Codling-moth. 



*» APPLE. 



Fig. 154. Pear slugs skeletonising the leaf. 



