44 MAINE AGRICULTURAL EXPERIMLNT STATION. 



ried on by the Bureau of Plant Industry. The Station patholo- 

 gist is supplied with printing shipping tags which will carry 

 packages of diseased plants without prepayment of postage and 

 which can be furnished to those who will send specimens. 



OCCURRENCL OE PLANT DISEASES IN I913 WITH RECOMMENDA- 

 TIONS FOR THEIR CONTROL. 



An accurate record is kept of all specimens received giving 

 date and place of the collection, and the name of the collector. 

 The following discussion is based upon the observations made 

 by the pathologists during the season, and upon specimens 

 received from various sources. No attempt is made, however, 

 to include all plant diseases recorded during the season, but 

 simply to mention certain of those which for a particular rea- 

 son are considered worthy of special consideration. 



Diseases of orchard trees and fruits. 



Apple scab on the fruit and leaves while quite prevalent was 

 not so common nor so destructive as in 1912. This was with- 

 out doubt due to differences in seasonal climatic conditions. 

 Mention was made in the previous report of the occurrence of 

 scab on the limbs of some varieties of apples which resulted in 

 iriorc or le^- killing back of the twigs of the current year's 

 grc.', t'\ Many more specimens of this form of the disease were 

 collected or received from correspondents during the winter 

 and spring months of 1913. The results of certain studies on 

 this and of spraying experiments on apples are given under a 

 separate heading. 



Fewer specimens of crown-gall upon nursery stock were re- 

 ceived than for the past two or three years. So far this has 

 all come from trees shipped in from outside the State, no speci- 

 mens having been received which were reported as coming from 

 Maine nurseries. Apple trees affected by crown-gall should 

 not be set. 



Apple rust, which is common and destructive in some states 

 was sent in for the second time since the present record was 

 started some 7 years ago. Both specimens have come from 

 the southwestern part of the state, as apple rust is only found 



