Vedalia Beetle | Insect - Encyclopedia Britannica

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use against cottony cushion scale

• In biological control

  …an Australian ladybird beetle, or vedalia beetle (Rodolia cardinalis), on the cottony cushion scale in California; the limiting of the proliferation of the European rabbit in Australia by introduction of myxoma virus (which causes the disease myxomatosis); the control of Japanese beetles by Bacillus popilliae, which causes milky disease; and…

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• In ladybug

  The Australian ladybird beetle, or vedalia beetle (Rodolia cardinalis), was brought to western North America to help combat an outbreak of cottony-cushion scale (Icerya purchasi), which threatened to ruin citrus orchards. Both the larvae and adults of the convergent ladybug (Hippodamia convergens) are important aphid predators.

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• In origins of agriculture: Beginnings of pest control

  A species of ladybird beetle, Rodolia cardinalis, was imported from Australia to California, where it controlled the cottony-cushion scale then threatening to destroy the citrus industry. A moth introduced into Australia destroyed the prickly pear, which had made millions of acres of pasture useless for grazing. In the 1880s the…

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• In insect: Ecological factors

  A predatory ladybird beetle, the vedalia beetle (Rodolia cardinalis), was introduced from Australia, and within a year or two the scale insect had virtually disappeared. The success was repeated in every country where the scale insect had become established without its predators. In eastern Canada in the early 1940s the…

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