The reddish brown body, which measures 5– mm long, is oval or nearly round. Icerya purchasi Maskell, cottony cushion scale (Hemiptera: Margarodidae), causing damage to ornamental plants growing outdoors in London. In mature females there is a large (sometimes 25 mm long), white, fluted ovisac. Crawlers are often not the same color as the adults of the species. I say obvious because there was definitely something that wasn’t right with the plant. Cottony cushion scales, for example, are off-white but the crawlers are orange. Armored scales, oak pit scales, and sycamore scale do not excrete honeydew. 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 cottony maple scale, Pulvinaria innumerabilis (Rathvon), is a highly modified insect pest that commonly attacks silver and red maples in Ohio. Figure 27.
The “cotton” is composed of wax filaments. One of the most effective is the use of horticultural oils to smother the insects. Second instar cottony-cushion scale. Cottony cushion scales retain their legs, eyes, and antennae for their entire life and remain mobile. The female cottony cushion scale produces up to 1000 eggs, which are carried in the fluted white cottony egg sac.
The third instar moves to the heavy twigs and molts into an adult female. DAMAGE: Cottony-cushion scale extracts plant sap from leaves, twigs, and … Perhaps because the cottony cushion scale is an introduced pest, it has few predators and parasites. Photo 5. 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. Nymphs of the cottony cushion scale, Icerya purchasi. The other type, the ones with white, cottony tufts, are so-called naked scale and are represented by mealybugs and cottony cushion scale. Armored scales, oak pit scales, and sycamore scale do not excrete honeydew. Cottony cushion scale, European elm scale, soft scales, and certain other scales secrete sticky honeydew. Cottony-cushion scale definition is - a scale insect (Icerya purchasi) introduced into the U.S. from Australia that infests citrus and other plants. The vedalia, a small, reddish-orange, spotted lady beetle, is highly effective in controlling cottony cushion scale, but vedalias are more susceptible to pesticides than are scales. The scale, adults and nymphs, sucks sap and weaken plants. Figure 27. DAMAGE: Cottony-cushion scale extracts plant sap from leaves, twigs, and branches, reducing tree vigor. The male cottony-cushion scale is minute, red and winged.
For anyone trying to understand biological control, the typical starting point is the cottony cushion scale story. Cottony cushion scales are commonly brown/black with a grey or white cotton wool like covering when they produce eggs. Basic Information. At each successive molting of the exoskeleton, the insects move, leaving a cottony, waxy mass behind, giving rise to the name.
British Journal … It is also reported on beautyberry, jasmine, mulberry, and hydrangea. Third instar male nymphs form pupae within which the male develops its wings. 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. What was causing the problem may not have been so obvious. The cottony maple scale, Pulvinaria innumerabilis (Rathvon), is a highly modified insect pest that commonly attacks silver and red maples in Ohio. For cottony cushion scale, there are some control options. Third instar male nymphs form pupae within which the male develops its wings. Cottony Cushion scale insects are also distinct from other scale insects in that they retain their legs, therefore their mobility, throughout their life. Older instars move to the twigs, branches, or trunk to feed. The crawler settles on a leaf or twig and molts twice for a total of 3 nymphal instars. This is best applied when the scale are in their younger nymph stages, so make sure to regularly check your landscape for pests. Basic Information. Second instar cottony-cushion scale.