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