DISEASES OF FRUIT TREES. 123 



possible for the fungus to enter at either the stem cavity or 

 the calyx basin. If we raise apples free from disease by proper 

 spraying and if we use the proper precaution in renovating our 

 storage cellars, we can recude the the loss from iDink rot to a 

 minimum. The disease is recognized by the deep cavities it 

 causes and by the pinkish moldy appearance about the decay- 

 ing portion. 



Twig-blight is perhaps the disease which presents the most 

 difficult proposition to the apple grower, especially when he 

 deals with varieties most susceptible to blight. There seems 

 to be only one solution of the problem, and that is, to keep up 

 the practice of careful selection of buds and scions in propoga- 

 tion until we have established varieties or strains of varieties 

 which are blight resistant. Such varieties as the Hyslop crab, 

 the Snow and the Missouri Pippin are too valuable to be dropped 

 from our list and yet in some sections of the state it is impossi- 

 ble to grow them on account of blight. 



DISEASES OF THE PEAR. 



Of the diseases of the pear tree, probably the two most 

 troublesome are twig blight and crown gall. The blight is by 

 far the most serious. The organism causing this disease is 

 suppose to be identical with that causing the blight of the apple 

 twigs {Bacillus amylovorus Burr). For years the greatest diffi- 

 culty of growing pears seemed to be how to overcome the blight, 

 but since the introduction of varieties which are fairly resistant, 

 growers are trying to assign some other reason for the failure 

 to fruit. The crown gall trouble is apparently not very serious 

 in its effect on the tree, but the presence of those unsightly 

 nodular growths on the roots condemn the stock and make the 

 disease of sufficient importance not to be overlooked. 



DISEASES OF THE PEACH. 



The peach is perhaps freer from the attacks of harmful 

 diseases than any of the other common fruits. 



There are about a dozen different diseases which attack the 

 peach, and the seriousness of the effect of any of the diseases 

 seems to be governed largely by the variety and the locality in 



