Citrus leaf miner, Phyllocnistis citrella Stainton is a key pest of citrus plant. The objective this research to study effective of eucalyptus essential oil and citronella essential oil. By the way water and steam distillation. Tobaccl (Nicotiana tabacum), Derris (Derris elliptica), Heart-leaved moonseed (Tinospora crispa), Siam weed (Eupatorium odoratum), Neem (Azadirachta indica), Non-taai-yaak (Stemona collinsae). By the way fermentation. The experiment were conducted in the experiment area of the laboratory field Department of Entomology, Kasetsart University, Kamphaengsaen Campus, Nakhon pathom. And phytotoxic symptom. Fermentation for 5 days using water as a solvent at 25% w/v spay 7 time and 1 day interval with 3 replications. Evaluation by count number of worm trails. Result Siam weed (E. odoratum) and Neem (A. indica) are repellents appropriate. The destroy 0 and do not Phytotoxic. Both herb extracts can be prevent P. citrella.