Dec, 1909.] 



SOME APPLE DISEASES. 



127 



BITTER ROT OF THE APPLE. 



Glomcrella rufomaculans (Berk.) Spauld k Von Sch. 



The bitter rot fungiis produces cankers on the limbs as well 

 as a rot of the fruit. The rot develops much earlier in the year 

 than the black rot, and the adjacent tissue of the apple has a 

 bitter taste. In the South and the central West the bitter rot 

 is the most destructive apple disease. It is of very rare occur- 

 rence in New Hampshire, and it is probable that the climatic con- 

 ditions will prevent it from ever becoming serious here. 



Fig. 25.— Sprayed tree adjacent to the one .shown in Fif?- 24. 



FIRE BLIGHT. 



Bacillus amylovorus (Burrill) De Toni, 



This is a very serious disease of the pear. On the apple the 

 disease may start in the blossom or in the tender tips of growing 

 twigs and spread to kill the entire season's growth. Insects are 

 the great agency in the spread of the disease. The trouble is of 

 rare occurrence in New Hampshire, and has been seen by the 

 writer only on trees that were closely adjacent to seriously 

 affected pear trees. The destruction of affected limbs is the 

 only remedy. 



