New York AGRICULTURAL EXPERIMENT STATION. LT 
ing the least trace of the disease be rejected; for, although we 
have never seen any ill effects from the planting of affected 
apple trees, it appears probable that the disease may thus be 
spread. to other fruits like peaches and red raspberries which 
are sometimes much injured by it. 
A nurseryman in Wayne Co. writes as follows: “Two 
years ago we planted a row of apple trees affected with crown 
gall beside a row of healthy trees. This fall we dug up a num- 
ber of the trees and some had galls on them and some had not. 
The trees with the crown gall made just as good a growth as the 
healthy trees near by, the root system seemed to be healthy and 
supplying the top with all the nourishment needed for a strong 
growth.” 
“Harry Root.”—While examining nurseries for crown gall 
we came across a nursery trouble of apple trees which nursery- 
men call “ hairy root.” Affected trees have few, if any, large 
branch roots. The root system consists of a multitude of very 
small roots which spring in rosettes from the somewhat thick- 
ened main root, giving it a bushy or hairy appearance. (See Plate 
XXIII.) Affected trees are worthless for planting. 
One nurseryman tells us that he has known this trouble for 50 
years; another has known it 40 years; and it appears that many 
nurserymen are more or less acquainted with it. Yet we have 
never seen any published account of such an apple disease. 
While specimens of it are occasionally found in the majority of 
the nurseries in Western New York, we have not heard -of any 
nursery where it is sufficiently abundant to cause appreciable 
loss. Perhaps, one tree in each 500 may be affected with “ hairy 
root.” Nurserymen are pretty generally agreed that the disease 
shows itself on the seedlings and is much more common among 
Western-grown seedlings than among home-grown ones. The 
affected seedlings are usually rejected at the grafting bench, but 
sume are passed only to be discarded later when the trees are dug 
for market. , 
A tree affected with “hairy root” may at the same time suffer 
from attacks of woolly aphis or crown gall or both, but in the 
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