Solanum species

Nightshade species

Nonnative to FloridaFederal Noxious Weed ListFISC Category 1 Invasive
Species Overview

The Solanaceae plant family includes a very large genus of herbs, shrubs, trees and even climbing plants. It also contains plants such as tomato, potato, eggplant, petunia, and many invasive species such as tropical soda apple, aquatic soda apple and horsenettle. Plants in this family are usually hairy and often prickly, with a distinctive tomato-like smell. Most species within the genera Solanum are poisonous and should not be consumed by humans or wildlife. Many Solanum species are listed as Category II exotic invasives by the Florida Exotic Pest Plant Council.

Description

Solanum spp. that comprises the nightshades are erect, multi-branching, herbaceous perennial shrubs able to grow up to 13 feet in height. Stems are covered with short, dense hairs that are often armed with thorns. Leaves are alternate and vary in morphology, often ovate to elliptic with an acute tip and rounded to oblique base. Leaf margins are shallowly and irregularly lobed. Flowers are borne in corymbs at intervals on the stems. Yellow, globose fruit contain many seeds. Frugivorous birds eat the fruit and spread the seeds.

Impacts

Solanum spp. are prolific seed producers which may produce seed throughout the year. New plants can emerge from seed or roots. Root buds on existing plants are able to generate shoots, producing new plants. Root systems can be fairly extensive, reaching as far as 3 to 6 feet into the ground.

Management Plan


Management Options

The most effective means of controlling Solanum is the prevention of fruit production.

Cultural/Physical

Mulches may provide control of emerging seedlings.

Mechanical

Remove the entire plant by hand.  Mowing will be effective but frequency is critical for complete control and is particularly effective prior to fruiting.

Biological

The leaf-eating chrysomelid beetle Leptinotarsa undecimlineata, is reported to be host-specific and might be a useful control agent.

Chemical

Susceptible to translocated herbicides, including glyphosate, 2,4-D, and triclopyr applied to the foliage.  Repeat applications will be necessary to control plants from seedlings.