Citricola Scale

Pest: Citricola cale (Coccus pseudomagnoliarum)

Pest Type: Insect Pest

Major Identifying Features: Scale insects feed by sucking plant juices and some inject toxic salvia into plants, scales look different than other insects, females are circular to oval, wingless, and lack separate head or other recognizable body parts, mottled dark brown to gray, males are tiny, delicate, white to yellow with one pair of wings and antennae, females can reproduce without mating

Life Cycle: Complete metamorphosis, 4 stages (egg, larva, pupa, adult), eggs are produced beneath the body or cover of the female, nymphs walk along branches or spread with the wind, nymphs are yellow to orange and the size of a period, once they start feeding, they remain immobile for the rest of their lives, one generation per year

Pest Rating: Minor to moderate

Management Rating: Easy to moderate

Host/Season/Outbreak Information: Warm temperatures usually favour scale outbreaks and honeydew protecting ants are around

Damage Information: Can damage citrus and hackberry in the Central Valley, when numerous, some species can weaken a plant and cause it to grow slowly, infested plants appear water-stressed, leaves can turn yellow, and may drop prematurely, plants infested by soft scales and certain other species become sticky from honeydew and may blacken due to sooty mold growth

Management Options: Prevention and monitoring with sticky traps, controlling dust, cultural control with appropriate plant selection, biological control with predatory bugs, beetles, and lacewings (Chilocorus, Hyperaspis, Rhyzobius), parasitic wasps, chemical applications with horticultural oils in spring or summer

Sources:

Pests of Landscape Trees and Shrubs (Book)

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