Pyrus calleryana seeds are considered mildly poisonous to humans. When ground between the teeth and ingested in large quantities, glycosides in the seeds mix with stomach acid to form cyanide.Click to see full answer. Regarding this, is Bradford pear tree fruit poisonous?Pyrus calleryana ‘Bradford’ certainly has its negatives but its berries being poisonous is not one of them. To answer your question, the fruit on your ornamental pear is not poisonous but I would discourage your dog from eating a large amount of them.Also, does Bradford pear produce fruit? The Bradford pear cannot by itself produce fruit, but by hybridizing with other Callery pear varieties, it has earned a spot on the growing list of invasive plants that, to many eyes, pollute any landscape where they appear. In respect to this, are there any poisonous pears? ANSWER: Pear and apple trees are not particularly toxic, nor are the ripe fruit. The seeds contain amygdalin, which is a glycoside that can release cyanide.What are the berries on a Bradford pear tree?ANSWER: The little berries (aka pomes) are the the fruit of the Bradford Pear, and are considered inedible by humans.