Colorado potato beetle
The Colorado potato beetle (Leptinotarsa decemlineata), also known as the Colorado beetle, the ten-striped spearman, the ten-lined potato beetle or the potato bug, is a major pest of potato crops. It is approximately 10 millimetres (0.39 in) long, with a bright yellow/orange body and five bold brown stripes along the length of each of its elytra.
|Colorado potato beetle|
The genus Leptinotarsa is assigned to the chrysolmelid beetle tribe Doryphorini (located in subfamily Chrysomelinae), which it shares with four other genera: Calligrapha, Labidomera, Proseicela, and Zygogramma. This tribe is characterised within the subfamily by round to oval shaped convex bodies which are usually brightly coloured, simple claws which separate at the base, open cavities behind the procoxae, and a variable apicial segment of the maxillary palp.
Adult beetles average 6–11 millimetres (0.24–0.43 in) in length and 3 millimetres (0.12 in) in width. The beetles are orange-yellow in colour with ten characteristic black stripes on the elytra. The species name decemlineata, meaning 'ten lines' derives from this feature. Adult beetles may, however, be visually confused with L. juncta, the false potato beetle, which is not an agricultural pest. L. juncta also has alternating black and white strips on its back, but one of the white strips in the center of each wing cover is missing and replaced by a light brown strip.
The orange-pink larvae have a large, nine segmented, abdomen and black head, prominent spiracles and may measure up to 15 millimetres (0.59 in) in length in their final instar stage. The beetle larva has four instar stages. The head remains black throughout these stages, but the pronotum changes colour from black in first- and second-instar larvae to having an orange-brown edge in its third-instar. In fourth-instar larvae, about half the pronotum is coloured light brown.
The beetle is native to America and Mexico and is present in all of the States of America except Alaska, California, Hawaii, and Nevada. It now has a wide distribution across Europe and Asia, totalling over 16 million km2.
Its first association with the potato plant (Solanum tuberosum) was not made until about 1859 when it began destroying potato crops in the region of Omaha, Nebraska. It's spread eastward was rapid, at an average distance of 140 km per year. By 1874 it had reached the Atlantic Coast. From 1871, the American entomologist Charles Valentine Riley warned Europeans about the potential for an accidental infestation caused by the transportation of the beetle from America. From 1875, several western European countries, including Germany, Belgium, France and Switzerland, banned imports of American potatoes to avoid infestation by L. decemlineata.
These controls, ultimately, proved ineffectual as the Colorado Potato Beetle reached Europe soon after. In 1877, L. decemlineata reached the United Kingdom and was first recorded from Liverpool docks, but it did not become established. There have been many further outbreaks but the species has been eradicated in the UK at least 163 times. The last major outbreak was in 1976. It remains as a notifiable quarantine pest in the United Kingdom and is monitored by DEFRA in order to prevent it becoming established. A cost-benefit analysis from 1981 suggested that the cost of the measures used to exclude L. decemlineata from the UK was less than the likely costs of control if it was introduced.
Elsewhere in Europe the beetle became established near USA military bases in Bordeaux during or immediately following World War I and had proceeded to spread by the beginning of World War II to Belgium, the Netherlands and Spain. The population increased dramatically during and immediately following World War II and spread eastward, and the beetle is now found over much of the continent. 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 East Germany they were known as Amikäfer ('Yankee beetles') following a governmental claim that the beetles were dropped by American planes. 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 established in any of these Member States, but occasional infestations can occur when, for example, wind blows adults from Russia to Finland.
In the future the beetle has the potential to spread to temperate areas of East Asia, India, South America, Africa, New Zealand, and Australia.
Colorado potato beetle females are very prolific and are capable of laying over 500 eggs in a four to five week period. The eggs are yellow to orange, and are about 1 millimetre (0.039 in) 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 of their host plant. Larvae progress through four distinct growth stages (instars). First instars measure approximately 1.50 millimetres (0.059 in) long, and the last (fourth) instars measure 8 millimetres (0.31 in) in length. The first through third instars each last about 2–3 days duration; the fourth lasts 4–7 days. Upon reaching full size, each fourth instar spends 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. In 5 to 10 days, the adult beetle emerges to feed and mate. This beetle can thus go from egg to adult in as little as 21 days. Depending on temperature, light-regime and host quality, the adults may enter diapause and delay emergence until spring. They then return to their host plant to mate and feed; overwintering adults may begin mating within 24 hours of spring emergence. In some locations, three or more generations may occur each growing season.
Behaviour and ecologyEdit
L. decemlineata has a strong association with plants in the family Solanaceae, particularly those of the genus Solanum. It is directly associated with Solanum cornutum (buffalo-bur), Solanum nigrum (black nightshade), Solanum melongena (eggplant or aubergine), Solanum dulcamara (bittersweet nightshade), Solanum luteum (hairy nightshade), Solanum tuberosum (potato), and Solanum elaeagnifolium (silverleaf nightshade). They are also associated with other plants in this family, namely the species Solanum lycopersicum (tomato) and the genus Capsicum (pepper).
At least thirteen insect genera, three spider families, one phalangid (Opiliones), and one mite have been recorded as predators of the varying stages of L. decemlineata. These include the ground beetle Lebia grandis, the Coccinellid beetles Coleomegilla maculata and Hippodamia convergens, the Shield bugs Perillus bioculatus and Podisus maculiventris, as well as various species of the lacewing genus Chrysopa, the wasp genus Polistes, and the damsel bug genus Nabis.
The predatory ground beetle L. grandis is a predator of both the eggs and larvae of L. decemlineata, and its larvae are parasitoids of the pupae. An adult L. grandis may consume up to 23 eggs or 3.3 larvae in a single day.
In a laboratory experiment, Podisus maculiventris was used as a predatory threat to female L. decemlineata specimens, resulting in the production of unviable trophic eggs alongside viable ones; this response to a predator ensured that additional food was available for newly hatched offspring in order to increase their survival rate. The same experiment also demonstrated the cannibalism of unhatched eggs by newly hatched L. decemlineata larvae as an anti-predator response.
Beauveria bassiana (Hyphomycetes) is a pathogenic fungus that infects a wide range of insect species, including the Colorado potato beetle. It has shown to be particularly effective as a biological pesticide for L. decemlineata when used in combination with the bacterium Bacillus thuringiensis.
As an agricultural pestEdit
In about 1840, L. decemlineata adopted the cultivated potato into its host range and it rapidly became a most destructive pest of potato crops. They are today considered to be the most important insect defoliator of potatoes. They may also cause significant damage to tomato and eggplant crops with both adults and larvae feeding on the plant's foliage. Larvae may defoliate potato plants resulting in yield losses of up to 100% if the damage occurs prior to tuber formation. Larvae may consume 40 cm2 of potato leaves during the entire larval stage, but adults are capable of consuming 10 cm2 of foliage per day.
The economic cost of insecticide resistance is significant, but published data on the subject is minimal. In 1994, total costs of the insecticide and crop losses in the US state of Michigan were $13.3 million, representing 13.7% of the total value of the crop. The estimate of the cost implication of insecticides and crop losses per hectare is $138–368. Long-term increased cost to the Michigan potato industry caused by insecticide resistance in Colorado potato beetle was estimated at $0.9 to $1.4 million each year.
The large scale use of insecticides in agricultural crops effectively controlled the pest until it became resistant to DDT in 1952 and dieldrin in 1958. Insecticides remain the main method of pest control on commercial farms. However, many chemicals are often unsuccessful when used against this pest because of the beetle's ability to rapidly develop insecticide resistance. Different populations in different geographic regions have, between them, developed resistance to all major classes of insecticide, although not every population is resistant to every chemical. The species as a whole has evolved resistance to 56 different chemical insecticides. Known mechanisms of Colorado potato beetle resistance to insecticides include enhanced metabolism involving esterases, carboxylesterases and monooxygenases, and target site insensitivity, as well as reduced insecticide penetration and increased excretion. There is also some evidence of behavioral resistance.
|Insecticide class||Product name||Potato||Eggplant||Tomato||Notes|
|Organophosphate||Phosmet||X||on US Emergency Planning List of Extremely Hazardous Substances|
|Disulfoton||X||X||Usage restricted by US government; manufacturer Bayer exited US market 2009|
|Carbamate||Carbaryl||X||X||X||Widely used in US|
|Carbofuran||X||One of the most toxic carbamates|
|Chlorinated hydrocarbon||Methoxychlor||X||X||Banned in EU 2002, in USA 2003|
|Endosulfan||X||X||X||Acutely toxic, bioaccumulates, endocrine disruptor. Global ban 2012 with exemptions until 2017|
|Insect growth regulator||Azatin||X||X||X|
Bacterial insecticides can be effective if application is targeted towards the vulnerable early-instar larvae. Two strains of the bacterium Bacillus thuringiensis produce toxins which kill the larvae. Other forms of pest control, through non-pesticidal management are available. Feeding can be inhibited by applying antifeedants, such as fungicides or products derived from Neem (Azadirachta indica), but these may have negative effects on the plants as well. The steam distillate of fresh leaves and flowers of tansy (Tanacetum vulgare) contains high levels of camphor and umbellulone and these chemicals are strongly repellent to L. decemlineata.
Crop rotation is, however, the most important cultural control of L. decemlineata. Rotation may delay the infestation of potatoes and can reduce the build-up of early season beetle populations because the adults emerging from diapause can only disperse to new food sources by walking. One 1984 study showed that rotating potatoes with non-host plants reduced the density of early season adults by 95.8%.
Other cultural controls may be used in combination with crop rotation: Mulching the potato crop with straw early in the growing season may reduce the beetle’s ability to locate potato fields, and the mulch creates an environment that favours beetle's predators; Plastic-lined trenches have been used as pitfall traps to catch the beetles as they move toward a field of potatoes in the spring, exploiting their inability to fly immediately after emergence; Flamethrowers may also be used to kill the beetles when they are visible at the top of the plant's foliage.
Relationship with humansEdit
Cold War villainEdit
During the Cold War the Warsaw Pact countries, fearing a food shortage, decried the beetle as a CIA plot to destroy the agriculture of the Soviet Union. Officials launched a Warsaw Pact-wide campaign to wipe out the beetle, villainizing them in propaganda posters and pulling schoolchildren from class to gather the bugs and drown them in buckets of benzene or spirit.
L. decemlineata is an iconic species and has been used as an image on stamps because of its association with the recent history of both North America and Europe. For example, in 1956, Romania issued a set of four stamps calling attention to the campaign against insect pests and it was featured on a 1967 stamp issued in Austria. The beetle also appeared on stamps issued in Benin, Tanzania, the United Arab Emirates, and Mozambique.
In popular cultureEdit
During the 2014 pro-Russian unrest in Ukraine, the word kolorady, from the Ukrainian and Russian term for Colorado beetle, (Ukrainian: жук колорадський, Russian: колорадский жук) gained popularity among Ukrainians as a derogatory term to describe pro-Russian separatists in the Donetsk and Luhansk Oblasts (provinces) of Eastern Ukraine. The nickname reflects the similarity of black and orange stripes on so called St. George's ribbons worn by many of the separatists.
- "Leptinotarsa decemlineata". Integrated Taxonomic Information System.
- "Leptinotarsa decemlineata, Colorado Potato Beetle: Synonyms". Encyclopedia of Life. Retrieved 2017-07-19.
- University of Florida (2007). "Featured creatures: Leptinotarsa spp.". Retrieved 2017-03-19.
- "Doryphorini". Encyclopedia of Life. Retrieved 2017-05-23.
- Jacques Jr., R. L. (1988). The Potato Beetles: The genus Leptinotarsa in North America. Brill. ISBN 0-916846-40-7.
- Gilles Boiteau; Jean-Pierre R. Le Blanc (1992). "Colorado potato beetle LIFE STAGES" (PDF). Agriculture Canada. Retrieved 2017-03-23.
- "Species Leptinotarsa decemlineata - Colorado Potato Beetle". BugGuide. 2017. Retrieved 2017-03-19.
- Weber, D. (2003). "Colorado beetle: pest on the move". Pesticide Outlook. 14: 256–259.
- Jean Feytaud (1949). La pomme de terre (in French). Presses universitaires de France. pp. 98–104.
- Willis Conner Sorensen (1995). Brethren of the net: American entomology, 1840-1880. History of American science and technology series. University of Alabama Press. pp. 124–125. ISBN 9780817307554.
- "Invasion history: Leptinotarsa decemlineata, Colorado Beetle". Non-Native Species Secretariat (DEFRA). 2017. Retrieved 2017-03-20.
- Aitkenhead, P. (1981). "Colorado beetle - recent work in preventing its establishment in Britain". Bulletin, Organisation Europeenne et Mediterraneenne pour la Protection des Plantes. 11 (3): 225–234.
- "The Colorado potato beetle is the grandmaster of adaptation".
- "The Colorado beetle".
- Alyokhin, A. (2009). "Colorado potato beetle management on potatoes: current challenges and future prospects". In Tennant, P.; Benkeblia, N. Potato II. Fruit, Vegetable and Cereal Science and Biotechnology 3 (Special Issue 1) (PDF). pp. 10–19.
- Bessin, R. "Colorado Potato Beetle Management". University of Kentucky College of Agriculture. Retrieved 2017-07-11.
- Ferro, D.N.; Alyokhin, A.V.; Tobin, D.B. (1999). "Reproductive status and flight activity of the overwintered Colorado potato beetle". Entomologia Experimentalis et Applicata. 91 (3): 443–448.
- "Leptinotarsa decemlineata (Say)". Biological Records Centre -Database of Insects and their Food Plants. Retrieved 2017-03-24.
- Hilbeck, A.; Kennedy, G. G. (1996). "Predators Feeding on the Colorado Potato Beetle in Insecticide-Free Plots and Insecticide-Treated Commercial Potato Fields in Eastern North Carolina". Biological Control. 6: 273–282.
- Weber, D.C.; Rowley, D.L.; Greenstone, M.H.; Athanas, M.M. (2006). "Prey preference and host suitability of the predatory and parasitoid carabid beetle, Lebia grandis, for several species of Leptinotarsa beetles". Journal of Insect Science. 6: 1–14.
- Tigreros, N.; Norris, R. H.; Wang, E.; Thaler, J. S. (2017). "Maternally induced intraclutch cannibalism: an adaptive response to predation risk?". Ecology Letters. 20 (4): 487–494. doi:10.1111/ele.12752.
- "University of Connecticut Extension". Archived from the original on 2006-09-01. Retrieved 2017-05-23.
- Wraight, S. P.; Ramos, M. E. (2017). "Characterization of the synergistic interaction between Beauveria bassiana strain GHA and Bacillus thuringiensis morrisoni strain tenebrionis applied against Colorado potato beetle larvae". Journal of Invertebrate Pathology. 144: 47–57.
- Drummond, F. A.; Casagrande, R. A.; Logan, P. A. (1992). "Impact of the parasite, Chrysomelobia labidomerae Eickwort, on the Colorado potato beetle". International Journal of Acarology. 18 (2): 107–115.
- Grissell, E. E. (1981). "Edovum puttleri, n.g., n.sp. (Hymenoptera: Eulophidae), an egg parasite of the Colorado potato beetle (Chrysomelidae)". Proceedings of the Entomological Society of Washington. 83 (4): 790–796.
- L. Ebrahimi; G. Niknam; G. B. Dunphy. "Hemocyte Responses of the Colorado Potato Beetle, Leptinotarsa decemlineata, and the Greater Wax Moth, Galleria mellonella, to the Entomopathogenic Nematodes, Steinernema feltiae and Heterorhabditis bacteriophora". Journal of Insect Scince. 11. doi:10.1673/031.011.7501.
- Chittenden, F. H. (1911). "On the natural enemies of the Colorado potato beetle". Bulletin United States Department of Agriculture, Bureau of Entomology. 82: 85–88.
- Francis A. Drummond; Richard A. Casagrande; Eleanor Groden (1987). "Biology of Oplomus dichrous (Heteroptera: Pentatomidae) and Its Potential to Control Colorado Potato Beetle (Coleoptera: Chrysomelidae)". Environmental Entomology. 16 (3): 633–633.
- Conrad Cloutier; France Bauduin (1995). "BIOLOGICAL CONTROL OF THE COLORADO POTATO BEETLE LEPTINOTARSA DECEMLINEATA (COLEOPTERA: CHRYSOMELIDAE) IN QUEBEC BY AUGMENTATIVE RELEASES OF THE TWO-SPOTTED STINKBUG PERILLUS BIOCULATUS (HEMIPTERA: PENTATOMIDAE)". The Canadian Entomologist. 127 (2): 195–212.
- David B. Richman; Frank W. Mead; Thomas R. Fasulo. "Spined Soldier Bug, Podisus maculiventris (Say)" (PDF). University of Florida, IFAS Extension. Retrieved 2017-07-31.
- Blackburn, M. B.; Domek, J. M; Gelman, D. B; Hu, J. S. (2005). "The broadly insecticidal Photorhabdus luminescens toxin complex a (Tca): activity against the Colorado potato beetle, Leptinotarsa decemlineata, and sweet potato whitefly, Bemisia tabaci". Journal of Insect Science (Online). 5 (1).
- Breithaupt, J. (4 November 2012). "Leptinotarsa decemlineata: Management". Ecoport. Retrieved 2017-07-28.
- Bonnemaison, L. (1961). Les ennemis animaux des plantes cultivées et des forêts, vol. II (in French). p. 98.
- Gullan, P. J.; Cranston, P. S., eds. (1994). "15.2.1 Insecticide resistance". The Insects: An Outline of Entomology. Chapman & Hall. pp. 404–407. ISBN 0-412-49360-8.
- Ferro, D. N.; Logan, J. A.; Voss, R. H.; Elkinton, J. S. (1985). "Colorado potato beetle (Coleoptera: Chrysomelidae) temperature-dependent growth and feeding rates". Environmental Entomology. 14: 343–348.
- "Plantwise Technical Factsheet, Colorado potato beetle (Leptinotarsa decemlineata)". Plantwise. Retrieved 2017-07-19.
- Grafius, E. (1997). "Economic Impact of Insecticide Resistance in the Colorado Potato Beetle (Coleoptera: Chrysomelidae) on the Michigan Potato Industry". Journal of Economic Entomology. 90 (5): 1144–1151. doi:10.1093/jee/90.5.1144.
- Andrei Alyokhin; Mitchell Baker; David Mota-Sanchez; Galen Dively; Edward Grafius (2008). "Colorado Potato Beetle Resistance to Insecticides". American Journal of Potato Research. 85 (6): 395–413.
- Alyokhin, A.; Baker, M.; Mota-Sanchez, D.; Dively, G.; Grafius, E. (2008). "Colorado potato beetle resistance to insecticides". American Journal of Potato Research. 85 (6): 395–413. doi:10.1007/s12230-008-9052-0.
- Hare, J. D. (1990). "Ecology and Management of the Colorado Potato Beetle". Annual Review of Entomology. 35: 81–100. doi:10.1146/annurev.en.35.010190.000501.
- "Leptinotarsa decemlineata". Arthropod Pesticide Resistance Database (Michigan State University). Retrieved 2017-03-24.
- Schearer, W. R. (1984). "COMPONENTS OF OIL OF TANSY (TANACETUM VULGARE) THAT REPEL COLORADO POTATO BEETLES (LEPTINOTARSA DECEMLINEATA)". Journal of Natural Products. 47 (6): 964–969. doi:10.1021/np50036a009.
- Wright, R. j (1984). "Evaluation of crop rotation for control of Colorado potato beetle (Coleoptera: Chrysomelidae) in commercial potato fields on Long Island". Journal of Economic Entomology. 77: 1254–1259.
- Grubinger, V. (2004). "Colorado Potato Beetle". The University of Vermont. Retrieved 2017-07-20.
- Sindelar, Daisy. "What's Orange and Black and Bugging Ukraine?". Radio Free Europe / Radio Liberty. Retrieved 18 May 2014.
Ukraine’s Reins Weaken as Chaos Spreads, The New York Times (4 May 2014)
(in Ukrainian) Lyashko in Lviv poured green, Ukrayinska Pravda (18 June 2014)
- "Stamp catalog : Stamp › Colorado Potato Beetle (Leptinotarsa decemlineata)". 2003–2017. Retrieved 2017-05-23.
- Skaptason, J. L (2000-10-28). "Skaps' bug stamps - Austria". Archived from the original on 2017-04-18. Retrieved 2017-05-23.
- "Potatobeetle.org Memorabilia". 2008. Retrieved 2017-05-23.
- Kramermay, A. E. (4 May 2014). "Ukraine’s Reins Weaken as Chaos Spreads". New York Times. Retrieved 2017-06-26.