Pests and Diseases Viewer
Hemispherical Scale Insect
Caused By:- The scale Insect Saissetia coffeaeDescription
Hemispherical scale insects is mainly a tropical pest, but it is also a pest in warm greenhouses and homes. It is a sap sucking insect that feed on plant juices and cause a loss of vigor and leaf deformations. Depending on the many host plant and temperature, the adult scale may vary in size from 2mm to about 5mm. The scale is relatively hemispherical, brown, smooth, and resemble a miniature army helmet with a line down the middle. Each female may deposit up to 1000 eggs. After laying the eggs, the female dies and her body shrinks to form a cup or helmet over the eggs. The eggs are laid over 2 to 3 month period from Spring. this result in the young hatching over a long time. The partly grown young are from about 1.0 millimeter long with two red eye spots very flat and with a notch at the rear end. The young do not move very much when they have begin to feed. There may be several generations each year in the greenhouse, with all stages being present at any one time. The secretion of honeydew results in the formation of sooty mould which reduces the beauty and commercial value of the plant. Picture by United States National Collection of Scale Insects Photographs Archive, USDA Agricultural Research Service, Bugwood.org.
See these other Scale insects Azalea Bark, Azalea Cottony, Beech Bark, Brown, Eucalyptus Gumtree, Euonymus Mussel, Horse Chestnut, Hydrangea, Juniper, Mussel, Oleander, San Jose, Scale, Soft, Viburnum Cushion, Wisteria, Wooly Vine.
Small infestations can be rubbed off with the fingers. They are relatively difficult to control by insecticides because the eggs and young nymphs are protected by the dead body of the mother. A systemic insecticide may help eliminate all feeding stages. Insecticidal soap will eliminate the young larval stage when they emerge from the mothers protection to begin feeding. A parasitical wasp (Metaphycus helvolus) can also be bought to control infestations.