New York Agricultural Experiment Station. 457 



soidea E. & E., which is a near relative of the apple-leaf 

 Phyllosticta, discussed on a previous page. One with good eye- 

 sight can readily see the perithecia, which appear like minute 

 black dots thickly sprinkled over the brown leaf-spots. 



The disease does not affect the health of the plant to any 

 great extent, because the horse-chestnut makes the principal 

 part of its growth early in the season before the leaves fall. 

 But it disfigures the foliage and the falling leaves are a source 

 of annoyance. A remedy is, therefore, desirable. 



In some experiments made by Fairchild* on nursery trees at 

 Geneva, N. Y., the disease was considerably checked by five ap- 

 plications of Bordeaux mixture, the first application being made 

 before the appearance of the disease. But "Prof. Galloway f 

 states that he has not been successful in combating the disease 

 by spraying. He thinks that frequently it may be caused by 

 agencies not affected by fungicides; for example, red spiders 

 may cause it. In such cases he thinks that much benefit might 

 result from a judicious use of the hose. When red spiders become 

 injuriously abundant in green-houses, they are managed by using 

 the hose freely. 



The Sycamore Disease. 



The sycamore or plane tree, Plataniis occidentalis, on Long 

 Island, is subject to a disease which is perhaps less conspicuous, 

 but is really more injurious, than the horse-chestnut disease. 

 It is so common that scarcely a tree entirely free from it can be 

 found on Long Island. 



The affected trees put out their leaves tardily, and until quite 

 late in the spring the foliage presents a scorched appearance. 

 During the winter season affected trees may be detected by 

 their stunted, scraggy appearance, due to the presence of nu- 

 merous rosettes of small twigs on the smaller branches. (See 

 plate XXXIII.) 



• Fairchild, D. O. Horse-Ohestnut Leaf-Blight. Journ. Myc, Vol. vii, pp, 352-3. 



t Galloway, B. T. Horie-Chestnut Leaf Disease. Amer. Gardening, Vol. xvii, No. 95, p. 662. 



