Second instar cottony-cushion scale. Cottony-cushion scale definition is - a scale insect (Icerya purchasi) introduced into the U.S. from Australia that infests citrus and other plants.
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This is best applied when the scale are in their younger nymph stages, so make sure to regularly check your landscape for pests. The mature females (actually hermaphrodites) have bright orange-red, yellow, or brown bodies (Ebeling 1959). These soft scales are usually first noticed during the summer months when the female produces a conspicuous white egg sac, called an ovisac, that appears as a ¼- to ½-inch long ball of cotton. Perhaps because the cottony cushion scale is an introduced pest, it has few predators and parasites. Cottony-Cushion Scale (Icerya purchasi), an insect of the family of giant coccids of the suborder Coccidae of the order Homoptera, a dangerous pest of citrus crops. The young scales, called crawlers, have legs and will move very slowly, or are blown by the wind, to a spot on a plant that they like. The crawler settles on a leaf or twig and molts twice for a total of 3 nymphal instars. One of the most effective is the use of horticultural oils to smother the insects. Cottony cushion scales, for example, are off-white but the crawlers are orange. In mature females there is a large (sometimes 25 mm long), white, fluted ovisac. Armored scales, oak pit scales, and sycamore scale do not excrete honeydew. At each successive molting of the exoskeleton, the insects move, leaving a cottony, waxy mass behind, giving rise to the name. Their waste products are a sweet honeydew that ants and wasps will feed on readily.

Nymphs of the cottony cushion scale, Icerya purchasi.

Common name Cushion scale Scientific name Pulvinaria floccifera Plants affected Camellia, Ilex (holly), Euonymus japonicus, Rhododendron, Trachelospermum, Taxus (yew) and some other evergreen plants Main symptoms Black sooty mould on the upper leaf surface in winter-spring; scale insects and white egg masses on the underside of leaves in spring and early summer


Photo 4. The adult beetle is black with a red spot on each wing. Key Points. Cottony cushion scales retain their legs, eyes, and antennae for their entire life and remain mobile. Cottony Camellia Scale - Shrubs Return to Soft Scales - Trees and Shrubs Cottony camellia scale on holly. The third instar moves to the heavy twigs and molts into an adult female.

Cottony cushion scales can have 2 - 3 generations per year. It is the only species of Icerya present in Florida. The “cotton” is composed of wax filaments. Second instar cottony-cushion scale. The crawler settles on a leaf or twig and molts twice for a total of 3 nymphal instars. The scale, adults and nymphs, sucks sap and weaken plants. Also black sooty mold. DAMAGE: Cottony-cushion scale extracts plant sap from leaves, twigs, and …

Cottony Cushion Scale Insect A sample of Pittosporum was brought into the office to have an obvious issue identified. Icerya purchasi Maskell, cottony cushion scale (Hemiptera: Margarodidae), causing damage to ornamental plants growing outdoors in London. Types of scale on citrus plants in the soft scale group are Caribbean Black Scale and Cottony Cushion Scale. Common name Cushion scale Scientific name Pulvinaria floccifera Plants affected Camellia, Ilex (holly), Euonymus japonicus, Rhododendron, Trachelospermum, Taxus (yew) and some other evergreen plants Main symptoms Black sooty mould on the upper leaf surface in winter-spring; scale insects and white egg masses on the underside of leaves in spring and early summer It is also reported on beautyberry, jasmine, mulberry, and hydrangea. Serious outbreaks of the cottony maple scale may last for two to three years, but their numbers become greatly reduced when natural predators, including a number of wasps and fly parasites, are present.

Basic Information. It is rarely seen. Comments Figure 27. Figure 27. The third instar moves to the heavy twigs and molts into an adult female. Life Cycle: Cottony cushion scale, Icerya purchasi, starts its life cycle as a crawler that emerged from the white sac of the female scale. The other type, the ones with white, cottony tufts, are so-called naked scale and are represented by mealybugs and cottony cushion scale. I say obvious because there was definitely something that wasn’t right with the plant.

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