CHAPTER III 

 APRICOT DISEASES 



THE apricot is, as a rule, a very healthy tree. However, 

 there are a few diseases which affect it to some extent. These 

 troubles are practically identical with those of the peach and 

 other stone-fruits. The more important diseases and injuries 

 discussed on succeeding pages are: brown-rot, frost-injury, 

 scab, Coryneum fruit-spot, rust and black-spot. During re- 

 cent years most attention has been given to the last three. 

 Doubtless brown-rot is the best-known disease of the apricot. 



BROWN-ROT 



Caused by Sclerotinia cinerea (Bon.) Schrot. (or possibly S. laxa Ad. 



and Ruhl.) 



The brown-rot disease so common on peaches and plums is 

 also prevalent on apricots in those regions where this fruit is 

 cultivated. It is regarded as a serious disease of the apricot in 

 Europe, causing greater total damage abroad than in America 

 on account of the more extensive apricot-culture in European 

 countries. In the state of California, however, considerable 

 damage is done to young twigs, which are wilted and killed 

 back, and to fruits on the tree, which are rotted as in the case 

 of peaches. Early apricots are said to suffer most, probably on 

 account of moisture relations rather than because of any varietal 

 peculiarities. 



No definite schedule of control has been demonstrated, but it 

 is recommended that self -boiled lime-sulfur be applied (1) just 



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