Giant devil's fig (Solanum chrysotrichum)

Giant devil’s fig is a fast growing prickly shrub. It can invade grazing land and competes with native plants.

Profile

How does this weed affect you?

Giant devil’s fig is an environmental and agricultural weed that forms dense thickets. It:

• outcompetes native plants
• competes with pasture grasses reducing productivity
• contains toxins
• has sharp prickles that can injure people and animals.

Livestock poisoning

Giant devil’s fig contains steroidal glycoalkaloids, which can be poisonous if eaten in large amounts. However, there are no reported cases of poisoning in Australia.

What does it look like?

Giant devil's fig is a shrub or small tree up to 4 m tall. It has prickly stems and leaves, which are very hairy when young. Small, white flowers grow in clusters from autumn to spring. It has shallow roots.

Leaves are:

• lobed, with 7–13 lobes per leaf
• 17–30 cm long and 12–20 cm wide
• hairy underneath
• alternate along stem
• on stalks 3–7 cm long.

Prickles are:

• usually sparse
• 3–9 mm long and up to 5 mm wide at base
• slightly curved
• present on stems, leaf stalks and the mid-vein of leaves.

Flowers are:

• white
• star-shaped
• 30–45 mm wide
• grow in clusters of up to 50.

Fruit are:

• round berry
• 10–15 mm diameter
• yellow or orange-yellow
• have lots of pale yellow-light brown seeds (about 2 mm wide).

Stems

Young stems are:

• greenish
• very hairy (hairs are red when new)
• have prickles.

Old stems are:

• greyish
• have thorns (3–9 mm long).

Similar looking plants

Giant devil’s fig looks similar to:

• Devil’s fig (Solanum torvum), which has smaller leaves and flowers. Hairs on new growth are whitish or yellowish rather than red.
• Tropical soda apple (Solanum viarum) which does not grow as tall and has larger fruit that are mottled when immature. The flowers are in clusters of up to 6 rather than up to 50 and the prickles are usually longer (12 mm).

Where is it found?

Giant devil’s fig commonly grows in the coastal areas of northern and central New South Wales. It is also a weed in Queensland, Victoria and Africa.

It originally comes from Mexico and central America.

What type of environment does it grow in?

Giant devil’s fig is able to grow in many soil types and conditions. It is found in:

• pastures (especially overgrazed or drought stressed)
• waterways
• forests (especially on the edges)
• roadsides
• parks and gardens
• disturbed areas.

Maps and records

• Recorded presence of Giant devil's fig during property inspections (Map: Biosecurity Information System - Weeds, 2017-2024)
  These records are made by authorised officers during property inspections under the Biosecurity Act 2015. Officers record the presence of priority weeds in their council area and provide this to the NSW Department of Primary Industries. Records reflect the presence of the weed on the date of inspection.
  
  

How does it spread?

Giant devil’s fig is spread by seed. Birds, flying foxes and other animals eat the fruit and spread the seed. Seeds spread by water and contaminated soil.

More information

back to top

Control

Giant devil’s fig can be controlled by physical removal and herbicides. Gloves and protective clothing should be worn to prevent prickle injuries.

Physical removal

Seedlings and small plants can be dug out with a mattock. Larger plants can be cut down and the roots dug up. 

Chemical control

Spot spraying

Plants can be spot sprayed with herbicides. Spraying will not kill the seeds in fruit so it is important to collect the fruit and dispose of it. Contact your local council for advice on how to dispose of the fruit.

Cut stump

Cut the stump and then quickly apply the herbicide gel. Apply a 3–5 mm layer of gel for stems less than 20 mm. Apply a 5 mm layer on stems above 20 mm.

Herbicide options

See Using herbicides for more information.

---

PERMIT 12942 Expires 30/08/2025
Glyphosate 360 g/L with Metsulfuron-methyl 600 g/kg (Only products registered for aquatic use)
Rate: A mix of 2 L glyphosate 360 herbicide plus 10 g of metsulfuron-methyl herbicide per 100 L of water (plus 500 mL of wetter/100L of water)
Comments: Spray actively growing plants, ensure all of the foliage is covered. For use in riparian areas. See permit for further critical comments.
Withholding period: Nil.
Herbicide group: 9 (previously group M), Inhibition of 5-enolpyruvyl shikimate-3 phosphate synthase (EPSP inhibition)
Resistance risk: Moderate

---

PERMIT 12942 Expires 30/08/2025
Picloram 100 g/L + Triclopyr 300 g/L + Aminopyralid 8 g/L (Grazon Extra®)
Rate: 350 to 500 mL per 100 L of water. (plus 500 mL of wetter/100L of water)
Comments: Spray actively growing plants, ensure all of the foliage is covered. For urban bushlands. Do not use within 5 m of a waterway. Apply a maximum of 2 times per year at a minimal interval of 60 days. See permit for further critical comments.
Withholding period: Where product is used to control woody weeds in pastures there is a restriction of 12 weeks for use of treated pastures for making hay and silage; using hay or other plant material for compost, mulch or mushroom substrate; or using animal waste from animals grazing on treated pastures for compost, mulching, or spreading on pasture/crops.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
Resistance risk: Moderate

---

PERMIT 12942 Expires 30/08/2025
Triclopyr 300 g/L + Picloram 100 g/L with Metsulfuron-methyl 600 g/kg (Various products)
Rate: A mix of 350 to 500 mL herbicide containing Triclopyr and Picloram plus 10g of herbicide containing metsulfuron-methyl per 100 L of water (plus 500 mL of wetter/100 L of water)
Comments: Spray actively growing plants, ensure all of the foliage is covered. For urban bushlands and forests. Do not use within 5 m of a waterway. Apply a maximum of 2 times per year at a minimal interval of 60 days. See permit for further critical comments.
Withholding period: Nil.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
Resistance risk: Moderate

---

Picloram 44.7 g/L + Aminopyralid 4.47 g/L (Vigilant II ®)
Rate: Undiluted
Comments: Cut stump application. Apply a 3-5 mm layer of gel for stems less than 20 mm. Apply a 5 mm layer on stems above 20 mm.
Withholding period: Nil.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
Resistance risk: Moderate

---

back to top

Biosecurity duty

The content provided here is for information purposes only and is taken from the Biosecurity Act 2015 and its subordinate legislation, and the Regional Strategic Weed Management Plans (published by each Local Land Services region in NSW). It describes the state and regional priorities for weeds in New South Wales, Australia.

Area	Duty
All of NSW	General Biosecurity Duty All pest plants are regulated with a general biosecurity duty to prevent, eliminate or minimise any biosecurity risk they may pose. Any person who deals with any plant, who knows (or ought to know) of any biosecurity risk, has a duty to ensure the risk is prevented, eliminated or minimised, so far as is reasonably practicable.
Greater Sydney	Regional Recommended Measure* (for Regional Priority - Eradication) Land managers should mitigate the risk of the plant being introduced to their land. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Notify local control authority if found.
Hunter	Regional Recommended Measure* (for Regional Priority - Prevention) Land managers should mitigate the risk of the plant being introduced to their land. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Notify local control authority if found.
North Coast Exclusion (eradication) zone: Bellingen Shire LGA, Clarence Valley LGA, Coffs Harbour City LGA, Kempsey Shire LGA, Lord Howe Island, Nambucca Valley LGA, Port Macquarie-Hastings LGA Shire LGA. Core infestation (containment) zone: Ballina Shire LGA, Byron Shire LGA, Kyogle Shire LGA, Lismore City LGA, Richmond Valley LGA, Tweed Shire LGA.	Regional Recommended Measure* (for Regional Priority - Containment) Whole of region: Land managers should mitigate the risk of the plant being introduced to their land. A person should not buy, sell, move, carry or release the plant into the environment. Exclusion zone: Notify local control authority if found. Land managers should eradicate the plant from the land and keep the land free of the plant. Core infestation: Land managers should mitigate spread of the plant from their land. Land managers should reduce the impact of the plant on assets of high economic, environmental and/or social value.
South East	Regional Recommended Measure* (for Regional Priority - Eradication) Land managers should mitigate the risk of the plant being introduced to their land. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Notify local control authority if found.
	*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfil the general biosecurity duty for this weed click here

back to top

Reviewed 2024