Controlling the scale will also get rid of the sooty mould. Eggs are laid under the scale shell and immature 'crawlers' emerge. After the sap has been used by the insects, it is excreted as honeydew, which forms the base on which a black fungus grows. Black scale (Saissetia oleae) insect pest of olives, citrus and gardenia, distributed throughout Queensland. Honeydew also leads to sooty mould, a black dusty fungus that grows over the leaves and stems. Scale insects are a serious pest that excretes a substance called honeydew, which can cause the infected plant to experience a lower growth rate. The insect is dark colored, and many people often miss identifying it because it can look like a natural deformity of plant â¦ The scale plant insect consists of three types: armored scale; soft scale; mealybug; Scales, both armored and soft, are the most destructive. COLIN CAMPBELL: When insect pests like these scale attack your plants, you've gotta get on to it right away. but also pachysandra, hollies, and camellias. Aphids, mealybugs and scales appear on plant parts in clusters and feed on the sweet sap by inserting a needle-like sucking tube into the plant and drawing out the juice. Scale insects There are thousands of species of scale insect. Common scales include black scale, pink wax scale, cottonycushion scale, San Jose scale, soft brown scale, red scale and white louse scale. Luke will feed on a range of scale including: white louse scale, red scale, oleander scale and oriental scale. Armored scales are more difficult to control once mature. Getting Rid of Scale Insects. Other scales, like the cochineal shown above, will form colonies on large cactus plants. Black scale (Saissetia oleae) is a small parasitic insect, only .2 inch long, that attacks mainly citrus and olive trees in Florida, California and throughout the Gulf of Mexico. The female scale cover is oyster-shaped, gray, and 1-1.5 mm long.Males are white (0.75 mm) with no cover and 2 visible wings ().In North Carolina there are three generations per year with first crawlers emerging in early May then in 6-8 week intervals. Scale insects involve small creatures ranging from the size of 2 to 3 mm in length. Some common species of scale insects in Australia are pink wax scale, black scale, soft brown scale and citrus red scale. Common Species of Scale Insects in Australia Scale look like small bumps and can be mistaken for part of the plant, as adults do not move. These are the most common pests performing damage in most indoor plants and orchards. Scale are parasitic insects that measure 2 or 3mm in length and can be found on ornamental trees and shrubs this also includes indoor plants and orchards and even ferns. Scales shoot a sweet substance called honeydew. Release Luke the scale eating ladybeetle (Chilocorus circumdatus). They feed on the plant tissue by sucking the sap from leaves, stalks and stems, which can result in stunted plant growth, defoliation, and even death of the plant. The insect under the protective scale feeds on the plant sap and can transmit virus diseases between plants. Dead scale donât always drop off plants immediately but will brush off easily with your fingernail compared to live ones. Scales produce honeydew that encourages sooty mould growth. There are scales like euonymus scales which prefer a specific type of evergreen tree but will as easily attack holly, ivy, and other evergreen plants, and those will be found around those plants. It feeds on the plant tissue by sucking it of its sap; thus, weakening the host plant. Ants like to âfarmâ the scale to feed on the honeydew. Theyâll even pick the scale up and move them all over the tree. Euonymus scale â Look for euonymus scale on leaves and stems of Euonymus spp. A sugary honeydew may be secreted and encourages black mould. These insects often have the appearance of flat or slightly mounded waxy, brown scales on leaves and stems. And I, like so many others, like to use home-made remedies when I can.