September Flowers

I have an Antique Gold apple tree which has borne well for years. This year , I didn't get around to spraying the orchard and this tree, and the one ne xt to it, only have about half of their leaves. This one has put out flower s on one small branch, which doesn't seem to be a good sign.
I'm going to put some fertilizer spikes around it and spray it with fungici de after picking the apples. Any other ideas on what to do?
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