332 



STATE HORTICULTURAL SOCIETY. 



The peach, plum, aud cherry are in some seasons quite subject to this dis- 



jj ease, which then destroys 

 a large part of the crop. It 

 seems particularly injurious 

 when the fruits are not 

 thinned, as, if two or more 

 are in contact, moisture con- 

 denses between them, and 

 assists in the germination 

 of the spores. The disease 

 is most severe in wet seasons 

 and to trees growing in 

 poorly drained soil. The 

 fruit should, at all events, be 

 well thinned and then, if 

 sprayed soon after the fruit 



oFig. 8— Structure of Brown Rot of Plum.— From drawing Sets, and at frequent inter- 

 by Butterfield, Class of '91, M. A. C. ■ va i s up to August 1, the 



*J 



7/U/eeJia. oeriuimti 

 tin fie a. r iV Te e 



F Sa ** e S "-p uj i yi <y . 

 ">» y t e J i 4 ;*t tills o J 



amount of fruit lost by rot would be greatly lessened, 

 eased fruit should be immediately destroyed. 



Of course all dis- 



OTHER PLUM DISEASES. 



Plum pockets and shot-hole fungus are common names given to fungi 

 that often are quite injurious to the plum. 



The former attacks fruit, new shoots and leaves, and causes the tissues 



toswell, so that, in the case 

 of the fruit, they resem- 

 ble an inflated bladder. 

 The term shot-hole fun- 

 gus has been given the 

 other disease, as it attacks 

 the leaves in circular 

 spots, and the affected 

 tissue dries up and drops 

 out, so that the leaves are 

 full of holes about the 

 size of shot. Beyond the 

 SeciieHtjciiitifUtj destruction of affected 

 fi'fVf-C y W portions of the tree, noth- 

 £&7**~£* j- i n g remains but to apply 

 '"* the fungicides, and to be 



Fig. 10.— Shot-Hole Fungus (Septoria pruni) on plum leaf. From^flp^^j.^^1 -j. ,„,,„.(. v.,, £,..-. 

 drawing by Stewart, class of '89, M. A. C. effectual It must De ire- 



quently done. 



f to ► t'ttjPtttit 



AjjttlecL It a} 



