58 HATCH EXPERIMENT STATION. [Jan. 



would control this outbreak. This treatment is only recom- 

 mended where such trees occur in valuable situations, such 

 as on lawns, etc., and where the expense of spraying would 

 equal the utility and value of the trees for shade or aesthetic 

 purposes. 



The sycamore has also shown, as it is very likely to each 

 year, more or less defoliation from a similar fungus. 



The Gloeosporium on the maple, previously mentioned in 

 our reports, has been more or less common, causing some 

 injury to the foliage, and a leaf-scorch entirely due to a lack 

 of water supplj^ causing a drying up of the leaves, has been 

 observed to some extent. 



This division frequently received specimens and letters 

 relating to these diseases. They do not constitute very 

 serious maladies, as a rule, and the question of treatment is 

 usually one based upon the utility of the tree under con- 

 sideration. 



Many elm leaves are frequently subject to the fungus 

 known as Dothidea XJlmi^ (Duv.) Fr., and the European 

 linden in some localities suffers from the effect of a leaf 

 spot (^Cercosijora mia'osora, Sacc). Both of these fungi 

 cause the foliage to become spotted and to fall prematurely. 

 It would not be a bad idea once in three or four years to 

 spray badly affected trees, so that they may at least once 

 in a while have a clean crop of foliage, which would exert 

 considerable influence on the growth of the tree. 



Other fungi which have been more or less common are the 

 tomato spot or mildew, leaf blight and leaf spot, the quince 

 rust, melon blight, bean anthracnose and asparagus rust. 

 Bacterial rot on cabbage has caused some loss to this crop, 

 and it was noticed in fields that had been planted to cab- 

 bages for the first time. 



The Dying of Cut-leaved Birches. 

 The dying of cut-leaved birches became quite a notice- 

 able feature in some places in the eastern part of the State 

 this past summer. The cause of this trouble was inciden- 

 tally due to borers, but in all probability it was primarily 

 brought about by the drought last season. Probably many 



