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We were told that any copper on the apples after the start of bloom could cause some little russett looking spots on the apples rendering them unmarketable. So, right or wrong we used Streptomycin. Expensive spray to say the least.

When I had a commercial apple orchard I treated it with antibiotics to limit the spread of fire blight. During the bloom period is when most blight is transmitted so we had a set of criteria that triggered a spray. During bloom, somewhat warm weather (I think it was 70 degrees or warmer) and...