236 Nebraska State Horticultural Society. 



SHOT-HOLE FUNGUS. 



(Cercospora circuniscissa) . 



This disease produces spots on the leaves of plum and cherry, and 

 to a less extent of peach; it attacks especially the Miner plum and the 

 English Morello cherry, most plums being free from attack. The 

 diseased spots may or may not drop out, but the leaves drop very early 

 in the season, injuring the tree seriously. The disease may spread 

 rapidly by means of conidia, and has been very prevalent in this vicinity 

 since 1903, killing great numbers of Miner plums and Morello cherries^ 

 and weakening other trees. 



TREATMENT. 



Spray with ammoniacal copper carbonate after petals fall, and 

 repeat at intervals if necessary. In the case of plums, and probably in 

 the first spraying of cherries, Bordeaux may be used instead of the 

 carbonate. 



It is an open question as to whether fungi causing heart and root 

 rot did not have a part in the recent general destruction of English 

 Morello cherries, attacking them after they had been weakened by the 

 loss of their leaves. But when, as in this recent case, trees are com- 

 pletely defoliaged for several years in succession, it is of no practical 

 importance whether the bracket fungi were present or not; the trees 

 would have been killed by such treatment as they received from the 

 shot-hole even if there were no such thing as heart rot. 



