SCALES

Possibly native to temperate climates in the U.S., and now found from California to Florida.

Native to North America, and distributed across the entire eastern half of the U.S. and into southern Canada, as well as in all states from the Rocky Mountains to the Pacific Coast. It also has been found in localized areas of mountains in northern Mexico and into British Columbia.

Believed to be native to South Africa, but now found throughout the world in mild climates where susceptible plants grow. It is a particular pest of olive trees, but also attacks oleander, citrus, and some other forest and landscape trees and shrubs.

Appears to be native to the Southeast United States.

Probably native to North America, and spread to other parts of the world on exported plant parts.

Uncertain, as some references indicate it is a native species while others indicate it entered the U.S. in San Francisco in the early 1900’s, and from there spread throughout the U.S. Now an extremely common pest of ornamental trees and shrubs, including liquidamber, elm, magnolia, locust, crabapple, maple, pyracantha, and all stone fruit trees such as peach, apricot, and plum.

Uncertain, but currently it is found worldwide in citrus growing regions. It is a major pest concern in the citrus industry in California, and in other parts of the world has been found infesting almond, pear, plum, and roses.

Native to Latin America and the southwest United States. Where the host cacti have been introduced to other countries the scale is now present as well, such as Spain and Australia.

Native to Australia, and first found in the U.S. in California around 1868 as a hitchhiker on acacia plants. Within 10 years it was a major pest on citrus in the west, and now is found worldwide on many kinds of plants. Because of the serious economic nature of this pest a major effort was made to find natural controls, leading to the discovery of Vedalia ladybird beetles that effectively preyed on it in California. When these predatory beetles were later sent to Florida the shipment included some of the scales, inadvertently introducing the pest to that state and its citrus industry. It is now found along the southern states from California to North Carolina.

Native to eastern North America, but now found throughout the U.S.

Native to Japan and China, but now well established throughout the U.S. and into Canada wherever suitable host plants are used in landscaping.

Native to Europe but introduced to North America, where it is found throughout the continent where elm trees are grown.

Despite its common name this is a native insect in North America, and is found in many fruit growing states.

Native to the mountains of Mexico, but now present in several states in the U.S., including California and Pennsylvania, and north into western Canada. It also is found in Australia.

Believed to be native to Europe, although it was originally described from specimens found in North America. It is now found in all temperate and tropical regions of the world.

Some species likely native to North America, but others found in Australia. In the U.S. they have been found in the southwest states and the southeast states.

Originated in South America, but now a common scale insect throughout the United States in greenhouses and interiorscape plantings.

Uncertain, but likely native to North America.

Native to Europe but now found throughout the world where host plants are available.

Native to the Orient, but introduced into the western U.S. on imported plants.

Some native species occur in North America

Believed to be native to Europe, but now present in all tropical and many temperate regions of the world.

This is a native insect in eastern North America.

Native to the western hemisphere, where it is found primarily in southern states and in the Caribbean.

These are native insects in North America.

Possibly a native insect in North America.

Uncertain, but probably native to North America. It is found throughout the U.S. where it infests many species of oak trees.

A probable native insect in North America.

Native to the deserts of southern California, but now found worldwide in warm or arid environments where imported plants have brought the insect to that region. Present throughout the U.S. and in Hawaii.

Thought to have originated in temperate Eurasia, but now found throughout the world.

Native to North America, and found throughout the country and Canada. It attacks a wide variety of pines, spruces, and cypress species.

Native to the Orient, and introduced on imported plants around 1870, where it was discovered in the area of San Jose, California. It since spread throughout the U.S. to become a devastating pest on fruit trees such as apple, plum, pear, cherry, peach, gooseberry, apricot, and others. With the introduction of DDT and other persistent insecticides in the 1940s this scale nearly disappeared from crops, but has since begun a resurgence due to lack of management and decreased spraying.

Uncertain, but possibly native to North America.

Possibly European in origin, as it is found commonly throughout Europe and in Asia, as well as in much of North America.

Native to North America.

Presumed to be native to the Oriental region, but now found throughout the world in temperate and tropical climates.

Native to North America