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ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 46 



and fruit disease, it has apple, chokeberry, crab apple, hawthorn, 

 dwarf Japanese quince, mountain ash. pear, shadbush, or quince 

 as an alternate host. In rainy periods of April and May, orange. 



Fig. 58. — Cedar-quince rust produces elongate, swollen cankers on 

 branches of juniper. During rainy periods in April and May, orange-colored, 

 gelatinous masses of fungus spores break through the cankerous bark. 



gelatinous masses of spores break through the rough diseased 

 bark of the galls on juniper (Fig. 58). These spores infect young 

 stems and fruit of quince, hawthorn, and other pomaceous hosts. 

 They produce long, slender, cream to white, tubelike structures 

 on twigs and fruit (Fig. 59). Diseased twigs are swollen and de- 

 formed. Diseased fruits are deformed and stunted. Bright orange 

 spores from the tubelike structures on twigs and fruit reinfect 

 junipers in late summer. Spraying hawthorn and other deciduous 

 hosts as recommended for cedar-hawthorn rust may control 

 cedar-quince (page 55 and Table 1). 



Juniper Blight. — This stem disease, caused by the fungus 

 Phomopsis juniperovora, occurs most frequently on red cedar. 

 However, it has been found on other species of juniper and on 



