Telegraph weed is an erect herb usually 50-100 cm tall with yellow daisy like flowers. It outcompetes native plants especially in coastal areas.
Telegraph weed grows quickly and can form dense infestations which:
Telegraph weed is an annual or biennial herb with stems up to 2 m tall, though usually 50-100 cm tall. Plants start as a rosette they then produce one or more upright stems. After flowering the stems die and do not reshoot till the following spring.
Telegraph weed looks similar to:
In NSW, most plants have been found in the Hunter region especially around Raymond Terrace and Newcastle. The first plants were found in the 1960s. One plant has been recorded in the North Coast region. There are also infestations in coastal regions of southeast Queensland.
Telegraph weed is native to south-western United States of America and northern Mexico.
Telegraph weed grows in warm temperate and subtropical climates. Plants can tolerate hot dry areas including semi-arid regions. Most plants have been found in sandy or rocky soils. In NSW and SE Queensland it has been found growing in:
Telegraph weed flowers produce up to 130 seeds per flowerhead. Seeds are spread by:
Csurhes, S. (2016) Invasive plant risk assessment Telegraph weed Heterotheca grandiflora Queensland Government.
Heyligers, P. C. (2008). Flora of the Stockton and Port Hunter sandy foreshores with comments on fifteen notable introduced species. Cunninghamia, 10(3), 493-511.
Lucid - https://keyserver.lucidcentral.org/weeds/data/media/Html/heterotheca_grandiflora.htm
Queensland Government (2022) Restricted invasive plant Telegraph weed Retrieved 21 December 2022 from https://www.daf.qld.gov.au/__data/assets/pdf_file/0011/1399160/telegraph-weed.pdf
Telegraph weed seedlings have shallow roots and can be hand pulled. Larger plants may need to be dug out because the plants develop fibrous roots as they mature. Hand pulling or digging out plants disturbs the soil and can stimulate seed germination. Follow up by checking for seedlings and remove them before they produce seeds.
Contact your local council for advice on how to dispose of this weed.
Spray actively growing plants before they flower. Ensure that all of the foliage is covered with the herbicide mix.
See Using herbicides for more information.
PERMIT 9907 Expires 31/03/2025
Glyphosate 360 g/L (Various products)
Rate: Rate of up to 1:50 with water
Comments: Spot spray actively growing plants. See permit for conditions and critical comments.
Withholding period: Nil.
Herbicide group: 9 (previously group M), Inhibition of 5-enolpyruvyl shikimate-3 phosphate synthase (EPSP inhibition)
Resistance risk: Moderate
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.
|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.
Regional Recommended Measure* (for Regional Priority - Asset Protection)
Land managers should mitigate the risk of the plant being introduced to their land. Land managers should mitigate spread of the plant from their land. A person should not buy, sell, move, carry or release the plant into the environment. Land managers should reduce the impact of the plant on assets of high economic, environmental and/or social value.
|*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfil the general biosecurity duty for this weed click here|