after two days of rain should fungicide be re-applied ,

August 8, 2019

i've been sticking to a fungicide spray programming, alternating copper and serenade, up til two days ago very few signs of blight on one group of plants none at all. now after two rainy damp days it seems as if the plants were zapped by blight over night. i pruned like hek but i know i didn't get every affective leaf. my question is,i sprayed copper the day before the rainy days on monday. can i now just a few days later follow up with serenade ? has anyone tried the peroxide for fungicide would that work. any advice or suggestions ? thank you

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