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Dioscorea bulbifera


Air potato

Synonym(s):
Family: Dioscoreaceae (Yam Family)
Duration and Habit: Perennial Vine


Photographer: USDA APHIS Archives
Source: USDA Animal and Plant Health Inspection Service, Bugwood.org

Description

Herbaceous, high climbing vines to 65 feet (20 m) long, infestations covering shrubs and trees. Twining and sprawling stems with long-petioled heart-shaped leaves. Spreading by dangling potato-like tubers (bulbils) at leaf axils and underground tubers. Monocots.

A distinguishing characteristic of air potato is that all leaf veins arise from the leaf base, unlike other herbaceous vines such as smilax and morningglories. Flowers are inconspicuous, arising from leaf axils in panicles 4 inches long, and are fairly uncommon in Florida. Vegetative reproduction is the primary mechanism of spread. This is through the formation of aerial tubers, or bulbils, which are formed in leaf axils. These vary in roundish shapes and sizes. In addition, large tubers are formed underground, some reaching over 6 inches in diameter.

Ecological Threat: Air potato can grow extremely quickly, roughly 8 inches per day. It typically climbs to the tops of trees and has a tendency to take over native plants. The aerial stems of air potato die back in winter, but resprouting occurs from bulbils and underground tubers.

Biology & Spread: New plants develop from bulbils that form on the plant, and these bulbils serve as a means of dispersal. The primary means of spread and reproduction are via bulbils. The smallest bulbils make control of air potato difficult due to their ability to sprout at a very small stage.

History: A native to tropical Asia, air potato, Dioscorea bulbifera, was first introduced to the Americas from Africa. In 1905 it was introduced to Florida. Due to its ability to displace native species and disrupt natural processes such as fire and water flow, air potato has been listed as one of Florida’s most invasive plant species since 1993, and was placed on the Florida Noxious Weed List by the Florida Department of Agriculture and Consumer Services in 1999.

U.S. Habitat: Rapid growing and occurring on open to semishady sites: extending from Florida to adjacent states. All dying back during winter but able to cover small trees in a year, with old vines providing trellises for regrowth. Spread and persist by underground tubers and abundant production of aerial yams, which drop and form new plants and can spread by water.

Distribution

U.S. Nativity: Introduced to U.S.

Native Origin: Tropical Asia; tropical and warm temp. eastern Asia (Bailey, L.H. and E.Z. Bailey, Hortus Third: A Concise Dictionary of Plants Cultivated in the United States and Canada, MacMillan Publishing Co., Inc., New York , (1977).); NatureServe Explorer

U.S. Present: FL, HI, LA, MS, PR, TX

Distribution: Forest edges, hammocks, and many disturbed areas.

Mapping

Invaders of Texas Map: Dioscorea bulbifera
EDDMapS: Dioscorea bulbifera
USDA Plants Texas County Map: Dioscorea bulbifera

Invaders of Texas Observations

List All Observations of Dioscorea bulbifera reported by Citizen Scientists

Resembles/Alternatives

Management



Preventative- Prevention is a key step in the management of air potato. Bulbils are the primary mechanism of spread, and research has shown even minutely small propagules can sprout and form new plants. How these bulbils are spread is speculative, but it appears movement of contaminated brush, debris or soil is the primary mechanism. Mowers and other brush-cutting equipment may also disperse long distances, either through contaminated equipment or throwing of the bulbils during the mowing operation. Spread via birds and other animals may occur, but this has not been confirmed. Water is also a major means of dispersal, so care must be taken to first eliminate populations along water bodies where bulbils may be easily spread. In addition, extra time must be utilized after flood events, as spread may be extensive.

Mechanical- Mechanical methods are limited for air potato, as control of the vines generally results in damage to the vegetation being climbed/smothered by the air potato. Burning also results in excessive damage to the native vegetation, as the fire follows the vines into the tree canopy. Mowing will help to suppress air potato, but as mentioned previously, this may increase the overall problem sue to spreading of the bulbils.

Biological- There is limited research and data on biological control of air potato

Chemically- Chemical control is one of the most effective means of control for air potato, but single applications will generally not provide complete control. This is due to resprouting of bulbils or underground tubers. A dilution of triclopyr (Garlon 3A at 1 to 2% solution or Garlon 4 at 0.5 to 2% solution) in water can be an effective control for air potato when applied as a foliar application. Be sure to include a non-ionic surfactant at 0.25% (10 mls or 2 teaspoons per gallon of spray solution). A 2 to 3% solution of glyphosate (Roundup, etc.) can also be effective. These herbicides are systemic (move throughout plant tissue) so care must be exercised to minimize off-target damage. If air potato vines are growing up into trees or other desirable species, vines should be cut or pulled down to minimize damage to the desirable vegetation. Pulling the vines down without severing them from the underground tuber will allow the herbicide to move into the tuber and provide better control. The best time to apply an herbicide is in the spring and summer when air potato is actively growing. Be sure to allow adequate time for the plant to regrow from the winter to ensure movement of the herbicide back into the underground tuber. (As plants grow and mature, they begin to move sugars back into the roots and below-ground tubers). However, treat before the plants begin to form new bulbils. Persistence and integration of control methods will be the key to complete air potato management.

USE PESTICIDES WISELY: ALWAYS READ THE ENTIRE PESTICIDE LABEL CAREFULLY, FOLLOW ALL MIXING AND APPLICATION INSTRUCTIONS AND WEAR ALL RECOMMENDED PERSONAL PROTECTIVE GEAR AND CLOTHING. CONTACT YOUR STATE DEPARTMENT OF AGRICULTURE FOR ANY ADDITIONAL PESTICIDE USE REQUIREMENTS, RESTRICTIONS OR RECOMMENDATIONS. MENTION OF PESTICIDE PRODUCTS ON THIS WEB SITE DOES NOT CONSTITUTE ENDORSEMENT OF ANY MATERIAL.

Text References

MacDonald, G., B. Sellers, K. Langeland, T.Duperron, and E. Ketterer. 2008. Invasive Species Management Plans for Florida. Accessed 21 November 2008: http://aquat1.ifas.ufl.edu/node/133.

Miller, J.H. 2003. Nonnative invasive plants of southern forests: a field guide for identification and control. Gen. Tech. Rep. SRS-62. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 93 pp (USDA SRS).

Online Resources

Miller, J.H. 2003. Nonnative invasive plants of southern forests: a field guide for identification and control. Gen. Tech. Rep. SRS-62. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 93 pp (USDA SRS).

Search Online

Google Search: Dioscorea bulbifera
Google Images: Dioscorea bulbifera
NatureServe Explorer: Dioscorea bulbifera
USDA Plants: Dioscorea bulbifera
Invasive Plant Atlas of the United States: Dioscorea bulbifera
Bugwood Network Images: Dioscorea bulbifera

Last Updated: 2008-11-24 by HTG
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