Part II.-FRUIT FOES. 



CilAPTKK I. 



APPLE PESTS. 



A INSECTS. 



American Blight (Schizonoura lanigera).— This pest, 

 ako known as the Woolly Aphis, iis not, as its popular 

 name would imply, of American origin. It is really a 

 European pest, which foimd its way to America and 

 thence to this country. It belongs to the Aphis family, 

 produces winged and wingless females, and, like other 

 aphides, bring.s forth its young alive during spring and 

 summer, eggs oidy being laid in autumn. The white 

 cottony substance found in patches on the ishoots, etc., 

 of trees is an excretion from glands on the back of the 

 female insects. The young aphides, or lice, are yellowish 

 or reddish in colour. Successive generations of the latter 

 are produced by wingleiss females from spring to autumn. 

 Late in the year wnnged females and males appear, the 

 former laying the egg, then dying. The eggs hatch in 

 spring. A few viviparous females, however, hibernate 

 in the bark or on the roots, come forth m spring, and give 

 birth to fresh broods. The lice pierce the tender parts of 

 the shoots with their beaks and extract the sap. The 

 punctures cause abnormal development of the cells and 



