[ THE APRICOT 



spinosae Pers. On both surfaces of the leaf, but chiefly on 

 the under surface, are formed numerous small yellowish 

 brown or chocolate brown powdery pustules. The disease 

 is more prevalent in the close of summer or in autumn, 

 and the pustules produced by the fungus on the leaves of 

 the apricot are larger than those produced on the leaves 

 of other stone fruits. The mildew of the apricot is rather 

 more frequent than that of the plum, on young trees, and 

 is also due to the same fungus Podosphaera tridac- 

 tyla DBy. In Italy and other countries of the continent 

 (Jorineum Beyerinckii Oud. and Clasterosporium amygda- 

 learum Sacc. attack the foliage of the apricot in the 

 same way as that of the plum, and Dermatella Pru- 

 nastri Pers. attacks also the living bark of the twigs of 

 the apricot. 



The dry rot fungus Fomes fulvus Fr. is rare on the 

 apricot in our orchards, and in Italy and Germany it is 

 replaced by Polyporus ignarius Fr. and P. nigricans Fr. 

 The root rot fungi attack the apricot grown on plum 

 stock frequently enough, but trees grown on own roots 

 or on almond are far less liable to suffer. 



Aphis Pruni Fb. occurs sometimes on the young 

 growths of the apricot, but the injury caused by this 

 Aphis is never very important, and generally passes 

 unobserved. The wingless insects which are light green 

 powdered white, are found as usual on the undersurface 

 of the leaf, which assumes a blistered and contorted 

 aspect. 



All apricots maturing in July and after, are fre- 

 quently attacked by the fruit fly (Ceratitis capita fa Wied.) 

 and in districts badly infested by the fly the crop of the 

 large-fruited late ripening apricots may be partly or 

 wholly destroyed by this insect. The fruit is punctured 

 by the fly when it is just turning yellow, so that it is not 

 always possible to ward off the attack by collecting the 

 fruit as soon as it approaches maturity and allowing it to 

 complete the process of ripening in the fruit room. 



