Appearance

Cuscuta japonica is an annual, parasitic vine that has recently been introduced into the United States. It is listed as a Federal Noxious Weed.

Foliage

The many-branching stems are fleshy, circular, and pale yellow with red spots and striations. Leaves are minute and scale-like.

Flowers

Flowers are abundant, pale yellow, and sessile.

Fruit

Fruits are capsules that are ovoid and 0.2 in. (5 mm) in diameter. The seeds are brown and grouped with 1 to 3 seeds per capsule.

Ecological Threat

Many species of dodder, some native and some exotic, occur in the United States. Cuscuta japonica parasitizes host plants by penetrating the vascular tissue of the host with structures called haustoria. Severe infestations can kill host plants. It is native to Asia and several infestations have recently been found in Texas, Florida, and South Carolina.

Resources

• Domestic Programs Pest Evaluation - USDA APHIS PPQ
• Federal Noxius Weed Inspection Guide - USDA APHIS PPQ
• New Pest Advisory Group Data Sheet - USDA APHIS PPQ
• South Carolina Infestation - Clemson University Regulatory and Public Service Programs
• Texas Infestation - Texas Forest Service
• Federal Noxious Weed Disseminules of the U.S. - USDA-APHIS

Selected Images

Maps

Invasive Listing Sources

• California Invasive Plant Council
• New Jersey Invasive Species Strike Team 2017 Invasive Species List
• Oregon Noxious Weeds
• South Carolina Exotic Pest Plant Council
• Texas Noxious Weeds

References