Kew Yokk Agricultukal, Expeeiment Station. 457 



fruit is attacked, numerous small black specks appear on its sur- 

 face. As the spots increase in size they often grow into each other 

 and form a large, dark, diseased area. The disease does not extend 

 so deep into the tissue of the fruit as to make it entirely worthless, 

 but the market value is greatly lessened. When the fruit is at- 

 tacked before it has reached its full size, it often occurs that the 

 quinces, like the diseased pears, are mishapen and iTudersized. 

 Greater damage is done to the trees when the leaves are severely at- 

 tacked. The loss of foliage in midsummer not only leaves the 

 fruit undeveloped but it is a severe check to the growth and vigor 

 of the tree. 



Treatment. — Favorable results in treating this disease with the 

 Bordeaux mixture are reported. It is suggested that the treat- 

 ment recommended for apple scab be used againiit quince fruit 

 spot and leaf blight, making the first spraying when the blossom 

 buds have appeared, the second just as the blossoms are falling, 

 and a third about two weeks later. 



RTJST. 



( Gymnosporangiu m spp. ) 



Description. — The rust is due to a fungus which becomes estab- 

 lished and develops within the tissues of the quince branches or 

 fruit. It causes knotty branches and peculiarly distorted fruit on 

 which there appear tiny fringed pits filed with orange colored 

 dust giving the diseased parts quite a brilliant appearance. 



In a different form this rust fungus attacks the red cedar and 

 the common juniper, forming galls on their branches. In these 

 galls are developed spores which, distributed by the winds to 

 quinces, juneberries, hawthorns and apples, become established 

 on these trees and cause the rust. Usually the rust is not abun- 

 dant enough on quinces to cause serious injury. It is usually 

 recommended that the cedar and juniper trees in the vicinity be 

 destroyed to prevent the breeding of the fungus on them and that 

 the rusted fruit or branches also be removed and destroyed. The 



