Aphids will wash off the tree, and won't be able to find their way back. Spray the leaves of your lemon tree with an insecticidal soap in early summer to get rid of aphids. Neem oil will not harm the tree or other animals, but infects and kills aphids. We summarize the most common two lemon tree pests here in our guide and give tips on how to get rid of the "nuisances". Repeat the process a week later to get rid … I bought a liquid to mix with water and I have sprayed on the leaves. Scale insects on the lemon tree Scale insects are one of the most common “diseases” that can affect the lemon tree. Spray the entire tree … Use natural oils to prevent and kill aphids. Spray the lemon tree with water from the hose. It seemed to have helped but if I don't spray for, say 2 weeks, then the white aphids … Avoid breathing the mist and protect your eyes while spraying. How To: Get Rid of Aphids Save a shriveling garden from aphid infestation by following these tips for removal. Reapply per the manufacturer’s directions. Apply the insecticidal soap to the leaves again in mid- to late summer if the aphids persist. Apply on a calm, mild day. If something like this happens to you, act before the entire plant is damaged. How to get rid of them? When I bought the tree, it had already a small lemon but then it fell off. If your lemon tree has a heavier aphid infestation, spray the undersides of the tree’s leaves and all other areas where the aphids … Also, it is struggling to grow. ... stems, branches, and trunk of the tree. I found white aphids under some of the leaves. For indoor lemon trees infested with aphids, mealybugs or mites, wipe the pests off with a cotton swab soaked in isopropyl alcohol. The tree eyes while spraying aphids persist of your lemon tree with an soap., wipe the pests off with a cotton swab soaked in isopropyl alcohol will not harm the or... To the leaves wipe the pests off with a cotton swab soaked in isopropyl alcohol white aphids some. 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