New York Agricultural Experiment Station. 367 



Fruit Spot. — Fruit spot and leaf blii^ht of the quince are caused 

 by the same fungus that causes pear leaf blight. When a fruit 

 is attacked, numerous small black specks appear on the surface. 

 As tiie 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 attacked 

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

 like the diseased pears, are misshapen and undersized. Greater 

 damage is done to the trees when the leaves are severely attacked. 

 The loss of foliage in midsummer not only leaves the fruit unde- 

 veloped but is a severe check to the growth and vigor of the tree. 



Remedy. — Favorable results in treating this disease with Bor- 

 deaux mixture are reported. It is suggested that the treatment 

 recommended for apple scab be used against quince fruit spot and 

 leaf blight, making the first spraying when the blossom buds have 

 appeared, the second just as the blossoms are falliug, and a third 

 about two weeks later. 



Leaf Blight. — See Fruit Spot above. 



Rust. — Judging from the unusual number of inquiries concern- 

 ing this disease that were received at this Station in 1894 and from 

 reports from other sources, quince rust was unusually prevalent last 

 season. The rust is due to a fungus which becomes established 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 filled 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 abundant 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 former recommend- 

 ation is not always practical, and whether the latter course will do 

 any good has not been definitely determined. 



Borers. — These insects work under the bark, as described under 

 apple borers, and are one of the most serious insect pests the quince 



