Fungicide sprays can be applied if the tree has a history of severe disease and blemish-free fruit are important (refer to spray guide on page 4). III. SPRAY GUIDE: A. PESTICIDES-Several fungicides are effective for control of many of the common diseases of pear.
http://www.ct.gov/caes/lib/caes/documents/publications/fact_sheets/plant_pathology_and_ecology/disease_control_for_home_pear_orchards.pdf
Fungus diseases can infect an entire ornamental pear tree grove. Ornamental pear trees (Pyrus calleryana) provide showy white flower clusters in the spring and brilliant red and yellow leaves in the fall. The inedible fruits measure only 1/2 to 1 inch in diameter.
http://homeguides.sfgate.com/black-spots-ornamental-pear-tree-leaves-33057.html
3 Pear scab, caused by the fungus Venturia pirina, is a disease which is quite similar to apple scab. The fungus causes circular, velvety olive-black spots on leaves, fruit, and sometimes twigs. As the lesions age, they become gray and cracked.
http://www.ct.gov/caes/lib/caes/documents/publications/fact_sheets/plant_pathology_and_ecology/disease_control_for_home_pear_orchards.pdf
This disease usually appears late in the growing season but can occasionally develop in late May and early June. Fabraea leaf spot attacks leaves, fruit, and twigs of pear. Symptoms first appear as brown to black spots on the leaves. Heavily infected leaves often yellow and drop prematurely.
http://www.ct.gov/caes/lib/caes/documents/publications/fact_sheets/plant_pathology_and_ecology/disease_control_for_home_pear_orchards.pdf
An ornamental tree, the Bradford Pear had full blooms of beautiful, small white flowers in spring, and equally nice purple and red foliage in the fall. The tree was extremely resistant to disease and pollution, two qualities that made it a hit in urban and suburban areas.
http://www.pearvarieties.net/chanticleer_pear/chanticleer_pear.html
The bacteria survive the winter in old cankers on pears and other plants and in healthy pear buds. This disease can occur in four phases: canker blight, blossom blight, shoot blight, and trauma blight.
http://www.ct.gov/caes/lib/caes/documents/publications/fact_sheets/plant_pathology_and_ecology/disease_control_for_home_pear_orchards.pdf
Fire Blight. Fire blight symptoms in ornamental pear trees include wilted, blackened leaves at the twig tips. In the spring, the bacterium Erwinia amylovora oozes from shoots and blossoms as it multiplies. Wind, rain, insects and contaminated pruning tools carry the spores to open flower buds during the spring and summer months.
http://homeguides.sfgate.com/black-spots-ornamental-pear-tree-leaves-33057.html
Plant the Chanticleer Pear in either the fall or the spring. If planted in the fall, its roots can get a head start so the tree will be more stable the next year. If the tree is properly pruned when young it will also develop stronger limbs and not be bothered by splitting problems in wind, snow or ice storms.
http://www.pearvarieties.net/chanticleer_pear/chanticleer_pear.html
Cultivars, such as Bradford and Chanticleer, grow up to 30 to 50 feet tall in U.S. Department of Agriculture Plant Hardiness Zones 5 through 9. Established ornamental pear trees tolerate drought and prefer full sun.
http://homeguides.sfgate.com/black-spots-ornamental-pear-tree-leaves-33057.html
The Chanticleer Pear is a variety of flowering pear tree. It was selected as Urban Tree of the Year in 2005 from a survey in City Trees magazine, the Journal of the Society of Municipal Arborists. The Chanticleer Pear is a callery pear tree, meaning it is ornamental and bears non-edible fruit. This pear tree, in fact, bears no fruit at all. The Chanticleer Pear tree is a cultivar that was bred to replace the Bradford Pear tree.
http://www.pearvarieties.net/chanticleer_pear/chanticleer_pear.html
what diseases are associated with the chanticleer pear tree
The fungus diseases are associated with the chanticleer pear tree.  Fungus diseases are associated with the chanticleer pear tree.