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How to Manage Pests

UC Pest Management Guidelines

Larva of citrus peelminer, Marmara gulosa, visible through the thin layer of rind tissue covering its tunnel in a navel orange.


Citrus Peelminer

Scientific Name: Marmara gulosa

(Reviewed 4/10, updated 4/10)

In this Guideline:


Adult moths deposit eggs on stems and fruit of citrus and neighboring crops such as eggplant. A small larva hatches from the egg and begins feeding on the skin of the fruit just below the egg shell. As the larva grows, it molts four to seven times and mines the stem or fruit creating a winding tunnel that grows wider as the larva gets larger. Just before pupation, the larva changes to a pink form with spinning mouthparts. The pink stage larva leaves the mine and spins a flat cocoon on a twig, leaf, or fruit. It decorates the cocoon with silk balls and then pupates. There is no overwintering stage; the insect continues development throughout the year, but the length of a generation is shorter during warm temperatures. There are 6-8 generations a year occurring at about monthly intervals from May to November.


Larvae form mines on the surface of the fruit.


Treatment for this pest is not generally recommended for eggplant. Damage to fruit is cosmetic and by the time it is noticed, it is too late to treat.


[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Eggplant
UC ANR Publication 3475
Insects and Mites
R. H. Molinar, UC Cooperative Extension Fresno County
J. L. Aguiar, UC Cooperative Extension Riverside County
M. J. Jimenez, UC Cooperative Extension Tulare County
P. B. Goodell, UC IPM, Kearney Agricultural Center, Parlier

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