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Colorado potato beetle: Map

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"Potato beetle" redirects here. This can also refer to similar Chrysomelidae, e.g. Lema trilineata.


Colorado potato beetle larvae


The Colorado potato beetle (Leptinotarsa decemlineata) - also known as the Colorado beetle, ten-striped spearman, the ten-lined potato beetle, potato bug - is an important pest of potato crops. It is approximately 10 mm (0.4 inches) long, with a bright yellow/orange body and 5 bold brown stripes along the length of each of its elytra, and it can easily be confused with its close cousin and look-alike, the false potato beetle. The beetle was described in 1824 by Thomas Say from specimens collected in the Rocky Mountains on buffalo-bur, Solanum rostratum. The origin of the beetle is somewhat unclear, but it seems to be that Coloradomarker and Mexicomarker are a part of its native distribution in southwestern North America.

Life cycle

Colorado potato beetle females are very prolific; they can lay as many as 800 eggs. The eggs are yellow to orange, and are about 1.5 mm long. They are usually deposited in batches of about 30 on the underside of host leaves. Development of all life stages depends on temperature. After 4-15 days, the eggs hatch into reddish-brown larvae with humped backs and two rows of dark brown spots on either side. They feed on the leaves. Larvae progress through four distinct growth stages (instars). First instars are about 1.5 mm long; the fourth is about 8 mm long. The larvae in the accompanying picture are third instars. The first through third instars each last about 2-3 days; the fourth, 4-7 days. Upon reaching full size, each fourth instar spends an additional several days as a non-feeding prepupa, which can be recognized by its inactivity and lighter coloration. The prepupae drop to the soil and burrow to a depth of several inches, then pupate. Depending on temperature, light-regime and host quality, the adults may emerge in a few weeks to continue the life cycle, or enter diapause and delay emergence until spring. They then return to their host plant to mate and feed. In some locations, 3 or more generations may occur each growing season.

As a crop pest

The Colorado beetle is a serious crop pest of potatoes. They may also cause significant damage to tomatoes and eggplants. Both adults and larvae feed on foliage and may completely eliminate the crop. Insecticides are currently the main method of beetle control on commercial farms. However, chemicals are often unsuccessful when used against this pest because of the beetle's resistance to toxins and ability to rapidly develop resistance to them. The Colorado potato beetle has developed resistance to all major insecticide classes. In the United Kingdommarker, where the Colorado beetle is a rare visitor on imported farm produce, it is a notifiable pest: any found must be reported to DEFRAmarker.

High fecundity usually allows Colorado potato beetle populations to withstand natural enemy pressure. Still, in the absence of insecticides natural enemies can sometimes reach densities capable of reducing Colorado potato beetle numbers below economically damaging levels. Beauveria bassiana (Hyphomycetes) is a pathogenic fungus that infects a wide range of insect species, including the Colorado potato beetle. It is probably the most widely used natural enemy of the Colorado potato beetle, with readily available commercial formulations that can be applied using a regular pesticide sprayer.

In Europe

Native ranges of the Colorado beetle and the potato
In 1877, the Colorado beetle reached where it was eradicated. During, or immediately following WWI it became established near USA military bases in Bordeaux and proceeded to spread by the beginning of WWII to Belgium, the Netherlands and Spain. The population increased dramatically during and immediately following WWII and it spread eastwards and it is now found over much of the continent. During World War II, the Nazi regime in Germanymarker, and many satellite states of Soviet Unionmarker used them for propaganda, claiming that the beetles had been dropped by the United States Army Air Forces. The Americans were also blamed by regime propaganda when after World War II, in the Soviet occupation zone of Germany, almost half of all potato fields were infested by the beetle by 1950. In the EU it remains a regulated (quarantine) pest for the UK, Republic of Ireland, Balearic Islands, Cyprus, Malta and southern parts of Sweden and Finland. It is not present in any of these Member States.

Philately

The Austrianmarker postal authority featured the beetle on a 1967 stamp.

The Belgian postal authority featured a drawing of the Colorado beetle and larvae on a 1934 and 1935 propaganda postcard.

Media references

The beetle is featured prominently in the science-fiction/horror novel The Devil's Coach Horse (also known as The Black Horde) by Richard Lewis. In the novel a plague of an evolved and flesh hungry type of the beetle (as well as the titular creature) is unknowingly released in Great Britain and the United States.

References



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