The State of Tamaulipas occupies the second place in citrus production in Mexico, with a surface of more than 40,000 hectares of citrus cultivars (oranges, grapefruits, tangerines, lemons and Mexican lime) and 500,000 ton per year. Homoptera species attack leaves, fruits, shoots, twigs, branches and trunks, causing economical damages every year. At the present, 21 species occur, including 5 whiteflies, 4 aphids, 1 mealybug, the cottony cushion scale, 3 soft scales, 6 armoured scales and recently, the Asian citrus psyllid, Diaphorina citri (Kuwayama). The most important species are: citrus blackfly Aleurocanthus woglumi (Ashby), California red scale Aonidiella auranti Maskell, Florida red scale Chrysomphalus aonidum (Linnaeus) and citrus snow scale Unaspis citri (Comstock). The other species usually are not primary pests because the parasitoid (Hymenoptera) and predator complex (Coccinellidae, Chrysopidae, Syrphidae), with native and exotic species, diminish the homopteran population effectively.