Ailanthus altissima From the root word ailanto- Meaning “tree of the gods” or “tree of heaven”

Taxonomy Classification Family: Simaroubaceae Genus: Ailanthus Species: altissima Related Species A. excelsa A. integrifolia A. malabarica A. triphysa A. vilmoriniana Common Names: Tree-of-Heaven Smoke tree Stink tree Chinese Sumac

Description Height: 25-30m tall (~100ft) Leaves: Odd-pinnately compound w/lancelate leaflets Twigs: Light brown with numerous lenticels. No terminal meristems are present. Bark: Smooth, thin cork epidermis w/ light grey brown age groves. Flowers: Produced in large panicles at the end of newly growing shoots. The colors range from green to reddish. Flowers appear in mid May (depending on the latitude). Male and female flowers are present on separate plants. Male flowers produce a rancid smell to attract flies and wasps. Female flowers can produce several thousand seeds. Fruit: 3-8 cm long schizocarp. Each fruit contains only one seed. Seeds are dispersed by the wind.

Habitat: Where is it native? A. altissima is native to china and was introduced into Europe and North America before the 1800’s. (was documented to be naturalized by the 1800’s in Tennessee) A. altissima is exceptionally tolerant to a wide range of conditions. Although, it does not grow well in intense shade or flooding.

Distribution in North America and Canada

Distribution in Nevada

States where Invasive

Places where action is taken! Connecticut- Invasive, banned Massachusetts- Prohibited New Hampshire- Prohibited invasive species Vermont- Class B noxious weed

A. Altissima Life History Traits Reproductive System- 1)Dioecious 2)Self-incompatible 3)Sexual and vegetative reproduction

A. Altissima Life History Traits Reproductive System Flowering & Fruiting periods 1)Flowers are small and extremely numerous 2)Short Flowering in April to July 3)Seeds can stay on the tree all winter 4)Seeds are not very nutritious to other animals

A. Altissima Life History Traits Reproductive System Flowering & Fruiting periods Juvenile Period (Very short) 1)Can grow up to 1m per year for the first 4 years 2)After that continues to out grow other native trees

A. Altissima Life History Traits Reproductive System Flowering & Fruiting periods Juvenile Period Germination Cues 1)Light… as little as 3% direct light through a canopy 2)Soil depth may play a role

A. Altissima Life History Traits Reproductive System Flowering & Fruiting periods Juvenile Period Germination Cues Light Requirements 1)Virtually no competitiveness in extreme shade 2)High light phenotypic plasticity-Because of wide range of suitable habitats

Arrival: How did it get here? In 1784, garden trade, PA In 1850’s, garden trade, CA Then… To other yards all over the US. Got into streams and other water ways. And traveled through the air.

Characteristics: What makes it invasive? Vacant niche There is no vacant niche to be used

Characteristics: What makes it invasive? Vacant niche Allelopathy 1)Ailanthone

Herbicidal effects under field conditions of A. altissima bark extract, which contains ailanthone, Heisey, R.M. et. al Abstract: – Extracted ailonthone from the roots of A. altissima and applied it, in varying amounts, in field conditions to plot sights and recorded: seed germination rate, biomass accumulation.

Results:

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability Modifies nutrient cycle Leaves decompose at much faster rates

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability Competition

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability Competition Extremely fast growing Allelopathic chemicals

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability Competition Micro-evolutionary Changes

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability Competition Micro-evolutionary Changes Escape from Biotic Restraints

Characteristics: What makes it invasive? Vacant niche Allelopathy Global Change Resource Availability Competition Micro-evolutionary Changes Escape from Biotic Restraints Um.. Duh.. In China: 30 predators In US: … Cynthia Silk moth (Samia cynthia), but only in silk production factories..

Impacts: Economic 111 acres of foothills and grass lands Modifies grassland habitat and agriculture fields Fast growing Costly to control biologically Roots can damage streets and foundations Good for nursery trade Cure for Cancer?

Screening of Korean medicinal plants for possible osteoclastogenesis effects in vitro Youn, Y. N. et. al Abstract: Bone loss is generally do to osteoclasts. In an experiment done with mice, 222 methonal extracts were examined. A molecule that inhibits the RANKL-induced osteoclast differentiation pathway was found in several.

Screening of Korean medicinal plants for possible osteoclastogenesis effects in vitro Youn, Y. N. et. al

Impacts: Ecological Converts native vegetation stands, esp. riparian habitat Uses lots of water Creates dead habitat for many organisms Modifies nutrition cycles

Plant growth regulatory effect and insecticidal activity of the extracts of the Tree of Heaven Tsao R. et. al Abstract: Secondary compounds of A. altissima have been said to have herbicidal and insecticidal properties. This could pose a public and ecologic health threat in many habitats.

Plant growth regulatory effect and insecticidal activity of the extracts of the Tree of Heaven Tsao R. et. al Conclusion: Testing on mosquito had no effect. Testing on alfalfa (Medicago sativa) showed strong inhibitory effects. These effects where increased in intense sun. This could have positive implications for a natural herbicide and insecticide (mosquitoes are different than herbivorous insects). Although, this also indicates that the the second trophic level capacity is reduced in those converted areas, creating a bottom up cascading effect. Also this could pose a threat to the agriculture of Nevada.

The role of native riparian tree species in decomposition of invasive tree of heaven leaf litter in an urban stream Swan, C. M. and Healey, B. Abstract: Humans rely on ecosystem services, but our activities degrade stream and river habitat. Replanting streamside vegetation is common, but does riparian tree biodiversity play a role in the effectiveness of these ecosystem services? By following the leaf litter decomposition rates of several tree species and modifying the composition of leaf litter we hope to understand this process.

The role of native riparian tree species in decomposition of invasive tree of heaven leaf litter in an urban stream Swan, C. M. and Healey, B. Results: Of 7 tree species Northern Red oak White oak Red maple Blackgum Tulip poplar Flowering dogwood Tree of heaven Tree of heaven leaves decomposed the fastest, causing a delay in other leaf decomposition. Tree of heaven litter was able to support large numbers of shredder species. This could cause a shift in nutrient movement in the habitat that could change the habitat functions.

Impacts: Social Farmers hate it Ornamental gardeners love it It looks cool

Management: Assessment Nevada currently does not have enough assessment information to include A. altissima on the noxious invasive species list. Only 3 counties have been surveyed

Management: Prevention Unless banned in all areas in and around the US, constant monitoring and screening is required to prevent re-infestations. This can be costly and unrealistic. But… Monitoring of areas that have seed dispersal corridors establishment in new areas can be prevented. This too is costly but more realistic.

Management: Control and Eradication Manual- Seedlings can be pulled or dug up as long as all the root comes with it. Removing the female plants can temporarily control the spread and proliferation of new individuals. Tilling could incorporate the seeds further into the soil inducing more germination No large animals eat it Burning doesn’t work unless it kills the whole root

Management: Control and Eradication Chemical- Works best as the plant comes out of winter dormancy Any readily available herbicide works such as triclopyr and imazapyr. But these chemicals are not specific

Management: Control and Eradication Biocontrol- Several members of the same genus are present in the US and not considered a noxious invasive. Because of the tough nature of A. altissima any pest brought over would have a degree of lethality and could cause massive agriculture and economic problems Although in NY some trees are being destroyed by fungal pathogens.

Literature Cited