Neem controls immature insects best, and is effective against chewing and sucking insects on citrus, as well as citrus leafminer. Alternatives include neem oil, bacillus thurigiensis, and spinosad sprays as well as beneficial insects such as beneficial nematodes and parasitic wasps. Kicking a Leaf Miner Infestation. It just treats the pests to divert them from your plants. Similar to the above, neem oil can help treat a range of chewing & sucking insects such as mites, aphids, caterpillars, citrus leafminer and more. As with all horticultural oils, apply neem oil early in the morning or in early evening to avoid leaf burn from the midday heat. Lucky for me, Mary special ordered a one gallon container of 100% neem oil for me ($0.75 per ounce), which should last over three years. Although leaf miner is unsightly, it's typically not too damaging to Citrus Trees. eco-neem will penetrate slightly into the leaf and actually kill the juvenile leafminer providing broader protection. Neem oil can disrupt the leafminers’ natural cycle.. which prevents them from spreading and becoming adults. Just two years later the leafminers also began to appear in Texas and then ventured to neighboring countries south of the border. Citrus leafminer, Phyllocnistis citrella Stainton, is an economically important insect pest of citrus in Pakistan, Mexico, the United States and many other citrus-producing countries. Citrus leaf miners prefer to attack lime, orange, lemon, and grapefruit trees. NOTE: Female citrus leafminers only lay eggs on early flushes of new growth. Just remember though that neem oil doesn’t necessarily kill the leaf miners. The neem oil solution is then absorbed by the plant through … #2: Neem Oil. The only containers of neem oil I could find locally were the little 8-ounce containers that cost $10 ($1.25 per ounce). Leaf miner is identified by squiggly lines in the leaves. Neem oil can be sprayed on your tree and is an excellent deterrent against pests. #3: Castile Soap The key to getting rid of a leaf miner infestation is to prevent it before it starts, but gardening doesn’t always work that way. Neem Oil is a natural insecticide that can be used to treat plants. Citrus Leaf Miners. Again apply every 5 to 14 days while new growth is present and ensure good coverage. Citrus leafminer is a pest that attacks all varieties of citrus, including some Australian native species. This variety of leaf miner was first discovered in 1993 in Florida. Alternatively on ornamental citrus spray new growth with eco-neem. Treatment: spinosad to treat the adult insects. A systemic treatment is one that gets applied when watering. The adult is a tiny, night flying moth with a wingspan of only five millimetres. In the 1940s, it was first noted as a pest in Australia, and in the 1970s it showed up in other major citrus growing areas of the world. 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