426 Agricultural I]xperiment Station, Ithaca, N. Y. 



one pear grower has complained to us that his young standard 

 orchard is gradually failing and that the difficulty seems to be 

 the abundance of galls which he finds upon the roots. 



Unfortunately, the cause of these galls is unknown, and it is 

 also uncertain as to just how much damage they do. Thej^ seem 

 to be widely spread in many countries, and they are known to be 

 abundant in some of the nurseries of New York state. No one 

 has ever been able to discover any insect or fungus which seems 



tli 



*»««^- 



■A 



131. — Root-galls upon apple trees from a nursery. 



to be the cause of the mischief.* We are now making experi- 

 ments with the affection; but in the meantime we desire to give 

 our fruit-growers the latest information which w^e possess on the 

 subject, because the extent of the injury in this state seems to 

 demand that the attention of every tree-planter should be drawn 

 to it. We always advise that trees with galls shall not be planted; 

 or if they are planted, that all galls should be removed. We do 



*The root-knot of the southern states and of greenhouses is a wholly different 

 trouble and is the woik of a nematode Avorm. There is also a root swelling or 

 gallon raspberries dne to the workof an insect. 



