62 



SPRAYING CROPS 



There are frequently found on the hmbs and 

 trunks of young apple trees, masses of a white, woolly 

 substance, beneath which are small, yellowish plant- 

 lice. These are the insects known as the Woolly 

 Aphis. There are two forms of the insect, one 

 attacking the roots, the presence of which may be 

 easily detected by the knotty appearance of the infested 

 rootlets, and one attacking the limbs and trunk. Like 

 other aphides, these insects multiply rapidly ^luring the 

 summer months, bA' gi\dng birth to living young. They 

 injure the tree by sucking out its sap through their 

 tiny beaks. They are especially liable to infest young 

 trees, or those which are unhealthy. 



Remedies — \Mien on the trunk and limbs spray 

 with kerosene emulsion ; on roots apply hot water, or 

 kerosene emulsion, or dig in refuse tobacco powder 

 and stems. 



INSECT ENEMIES OF THE FRUIT 



The insects affecting the fruit of the apple, which 

 may be fought by spraying, are the Codling ]\Ioth. and 

 the Pltmi and Apple Curculios. Of these, the Cod- 

 ling Moth or Apple Worm is the most destructive, 

 and is, in fact, the most generally injurious apple 

 insect. Its life-history has already been described in 

 the Introduction (page 2). In fighting this insect 

 it is often desirable to supplement the spraying with 

 burlap bands upon the trees the latter part of June to 

 trap the worms when they change to pupae, crushing 

 them before they emerge as moths. Care should be 

 taken also to prevent the egress of moths in spring 

 from rooms in which apples have been stored. 



In Oregon it seems to be necessary to spray late 

 for the second brood of worms. But if the burlap 

 bands were used persistently this probably could be 

 avoided. 



