I have citrus trees at my current home. I have never sprayed them with any insecticide because we eat the fruit. I use my garden hose with a strong spray nozzle to wash them with water once a week to knock off any unwanted insects. You can do this all year except when there are blooms/flowers. I get inside the trees to ensure I spay under the leaves where insects love to hide and lay eggs. This has worked for me for more than 20 years and the trees are all healthy. The water from the spray also goes to the ground to water the trees at the same time.
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