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Hi Barbara –
It depends on if you are using a copper concentrate spray or a “ready to use” variety (RTU). I would be more concerned about burning plants if you are using the concentrate, especially if there are citrus trees in your orchard. I would refrain from applying neem for at least 24 hours after liquid copper application, and would highly recommend using the RTU spray. Find exactly what you’re looking for here:
https://www.planetnatural.com/product/liquid-copper-spray/
https://www.planetnatural.com/product/pure-neem-oil/
Happy Spring!
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