Weed Spotter newsletter Issue 18
1. Garden centre fined for selling a State prohibited weed
A garden centre in south east Melbourne has been fined a total of $4500 for selling the noxious weed horsetail (Equisetum spp) at its Braeside nursery. The Moorabbin Magistrates' Court was told that in October last year the nursery had eight of the plants on display for sale. Prosecutor Tanyth Young said the store manager and a company director had admitted to stocking the plants for most of 2015.
The magistrate fined the company $1500 on each of three counts of offering to sell, display and possess a noxious weed. Agriculture Victoria's Biosecurity Manager for the South East, Peter Kennedy, said it was an important result given the risk that horsetails pose to Victoria's agricultural industries and environment. "Horsetails are among the world's worst agricultural weeds due to their invasive capabilities", he said. "They contain chemicals that are toxic to livestock and have the potential to become persistent weeds of wetlands and other low-lying areas in southern Australia."
Horsetails are declared as State prohibited weeds in Victoria, the highest classification of declared noxious weeds under the Catchment and Land Protection Act 1994. If you think you may have seen horsetails, please report it either through the Weed Spotter email email@example.com or ring the Customer Service Centre on 136 186. For more identification information about horsetails visit the Agriculture Victoria website at http://agriculture.vic.gov.au/agriculture/pests-diseases-and-weeds/weeds/state-prohibited-weeds/horsetails
2. Volunteer effort hits an all-time high in the fight to eradicate hawkweed from Falls Creek
The Falls Creek Hawkweed Eradication Program has once again succeeded in detecting and treating infestations of hawkweeds (Hieracium spp) in the Victorian high country. This season 104 volunteers, the highest number of volunteers ever, joined in the search for hawkweeds. The volunteers ranged in age from 15 to 81 years old, with some coming from as far as New South Wales, South Australia, Queensland, New Zealand and even China!
A total of 117 ha was surveyed by volunteers, contractors and Parks Victoria staff. Volunteers surveyed about 48% of this area and contributed 65% of total search hours. There were 28 new infestations found and 22 of these (79%) were found by volunteers. In total volunteers donated 2,906 hours to the program. While much of this time was spent surveying, volunteers helped with a range of tasks including organising teams, GPS tracking, flagging infestations, rope marshalling, time keeping, entering data, taking photos, supervising and leading teams.
The eradication of hawkweeds from Victoria's high country is dependent on a consistent search effort each season, to locate and treat these invasive plants. Volunteers make a substantial contribution to this and their involvement is greatly appreciated by Parks Victoria and Agriculture Victoria. If you would like to volunteer your time to this exciting project in the 2016/17 season, you can email firstname.lastname@example.org. The email box is monitored from October and the program runs in December and January.
3. Time to look out for camel thorn
Now is the time to start looking out for camel thorn (Alhagi maurorum) as emergence of new shoots can start as early as October, particularly on lands under irrigation. Camel thorn normally grows best in areas where it can access additional water during the growing season so look out on field borders, roadsides, along waterways, drainage lines and on irrigated land.
Camel thorn is a rigid, multi-branched, spiny shrub commonly 25–60 cm tall, but can grow up to 1.5 m. In Victoria vegetative reproduction by rhizomes, or re-sprouting root fragments, is the primary factor in localised spread. Its biology and ecological characteristics make it a hard weed to control, particularly once it has established. Early detection and rapid response to prevent establishment is critical to the camel thorn eradication program in Victoria.
If you think you may have seen camel thorn, please report it either through the Weed Spotter email email@example.com or ring the Customer Service Centre on 136 186. Please do not attempt to treat camel thorn yourself. Agriculture Victoria will treat, remove, and dispose of camel thorn safely, at no cost to the land owner. For more identification information please visit the Agriculture Victoria website at http://agriculture.vic.gov.au/agriculture/pests-diseases-and-weeds/weeds/state-prohibited-weeds/camel-thorn.
4. Invasive water weed detected in Nillumbik
A large infestation of the State prohibited weed water hyacinth (Eichhornia crassipes) has been treated on a property in Nillumbik Shire, after it was discovered by an eagle-eyed Weed Spotter who recognised the distinctive plant in photos on a real estate website. The infestation was discovered close to the Yarra River, and if undetected could have spread into the river, creating environmental damage and negatively impacting fishing and other water activities.
Agriculture Victoria Biosecurity Officers removed 377 water hyacinth plants from a pond on the property during June, with several thousand more plants subsequently detected and removed from a second location on the property.
Water hyacinth originates from Brazil and is extremely invasive. It can form dense mats across waterways, rendering them unusable for transport and recreation. Infestations of water hyacinth can also kill aquatic life by preventing light from penetrating the water and by reducing oxygen levels. Water hyacinth is one of the world's worst aquatic weeds and poses a serious risk to our waterways.
Water hyacinth can be identified by its distinctive mauve flower and bulbous spongy stems. If you think you may have seen water hyacinth, please report it either through the Weed Spotter email firstname.lastname@example.org or ring the Customer Service Centre on 136 186. Please do not attempt to remove the plants yourself.
For more identification information about water hyacinth please visit the website http://agriculture.vic.gov.au/agriculture/pests-diseases-and-weeds/weeds/state-prohibited-weeds/water-hyacinth
5. Heavy rains: Welcome, but ideal for alligator weed dispersal
While the recent heavy rains across the state are welcome, the downside of this is that the increased waterway flows and flooding are ideal for alligator weed(Alternanthera philoxeroides) dispersal. New alligator weed plants can readily grow from fragments dispersed from parent infestations, to produce new infestations downstream.
Alligator weed thrives both on land and in water, and it has an extensive and long-lived root system, making it a challenging State prohibited weed to control. The leaves are bright green and spear shaped, growing in opposite pairs along a hollow stem. Flowers are papery and ball shaped, silvery-white and grow on individual stalks. Roots grow from joints in the stem.
If you think you may have seen alligator weed, please report it either through the Weed Spotter email email@example.com or ring the Customer Service Centre on 136 186. Please do not attempt to treat or dispose of alligator weed yourself. Agriculture Victoria will treat, remove, and dispose of alligator weed safely, at no cost to the land owner.
For more identification information please visit the website at