1898.] PUBLIC DOCUMENT — No. 33. 69 



As to a remedy for this disease, there is little to say. 

 Spraying with fungicides is not to be practically considered, 

 on account of the size and small economic importance of the 

 tree. Gatherino; and burnino; diseased branches and leaves 

 might lessen the trouble somewhat ; but, if the disease con- 

 tinues to prevail, it will probably be best in the end to dis- 

 pense with the sycamore as an ornamental tree, and plant 

 something else instead. 



A Leaf Blight of the Butternut. 



(^Olocosjiorium Jtcglandis (Lib.) Mont.) 



No fungous disease has been more noticeable throughout 

 the State during the past season than this. It first became 

 apparent in July, when butternut trees were noticed to be 

 losing their foliage. Examination showed that the rapidly 

 falling leaflets were covered with dead and discolored spots, 

 and had lost their vitality. All trees were not affected in 

 the same degree, as some were almost completely defoliated 

 in August, while others were attacked later or lost their 

 leaves more slowly. By October 1, however, it was almost 

 or quite impossible to find a butternut tree which had not 

 lost the greater part of its leaves. 



The cause of the trouble is a fungus, which lives in spots 

 in the leaf, killing the tissue at these points and gradually 

 causing the death of the whole leaflet, so that it falls to the 

 ground. The disease spreads rapidly from leaf to leaf and 

 from tree to tree, and many trees are soon defoliated. It is 

 a well-known fungus, but has been unusually abundant this 

 year. 



A Leaf Spot of the Chestnut. 

 (^Septoria ochrolenca (B. and C.) 



This is another disease, quite similar to those above de- 

 scribed, which has been very prevalent this year. It first 

 became noticeable in July, when the ground under chestnut 

 trees was covered with fallen leaves. Upon these leaves the 

 fungus manifested itself very prominently in small, round, 

 dead spots, about one-eighth of an inch in diameter, scat- 

 tered over the surface more or less abundantly. These 

 spots are the points where the fungus has become estab- 



