pear seedling leaves turning black?

Can seedlings get fireblight? Everyone has been saying it's a bad year for it, could that have been it since the pears are the only ones that were having problems?
 
Only 1 apple made it, most of them shriveled and died about a month ago but the pears were doing great until about a week ago. The other seedlings I have that a doing good are bur oak and persimmons
 
No I didn't think to take pictures at the time. Is there anything that can be sprayed on the seedlings to prevent FB?
 
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