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Re: [APD] Ultrasound, sonication of algae

Hello Tom,

Here in the top end of Oz, the Darwin River has a nasty outbreak of Cabomba
caroliniana that has escaped from some ones aquarium or most likely a pond.
I was wondering if you think that sonication may help with that plant.

I am interested to find some details of the effectiveness of sonication
against aquatic plants.   Do you have any reference material on the
effectiveness of sound destroying vascular plants.


On 18/2/06 11:58 AM, "Thomas Barr" <tcbiii at yahoo_com> wrote:

> Sonication does work quite effectively.
> I use one in a lake.
> They do work well.
> They are very effective for BGA's and green water, they take a
> bit longer for filamentous forms of algae.
> I think the cost will disuade you from the use in a tank.
> Probably around 1200$ or so for the little one.
> I use a LG sonic XXL model.
> I think they can harm some thin leaf plants, at least I hope so,
> as I'm using this method to kill Hydrilla.
> I think at low levels, the effect on most plants is
> insignificant.
> I know it does not harm to pond weeds that are close to the
> unit.
> If the plant is very fine, delicate, then they will be more
> suspecptible. Hyrilla is only 2 cells thick for the leaves, no
> stomata.
> So some of the worse weeds, Eurasian Milfoil, Egeria densa,
> Hydrilla can be controlled via this method and we can raise
> weevils in mass to attack the Hyacinth so no herbicides are
> used. 
> The probelm is: no one has tried these methods and tend to frown
> upon anything other than herbicides. The weevils will certainly
> work at high levels, but we have been unsuccessful at growing
> them on artificial media, a key to being able to raise billions
> of them for dispersal, much like you would a herbicde spray.
> The weevils do not reproduce in CA because it's too cold, so if
> we could put a bunch out there during the spring, summer and
> fall, they could eat most of the weeds, then we could mop up the
> isolated pockets with some herbicide and greatly reduce labor
> and beat the weeds way back.
> The weevils beat the weed back in Lake Victoria very
> successfully, but it's nice a warm there.
> The weevils have passed inspection for CA and there is no
> requirements for the use of ultrasound for weed control in CA.
> A typical new herbicide registration process runs no less than
> 2-3 million $$$.
> Herbicides/insecticdes, fungicides/antibiotics tend to have a
> usable life of 30-40 years before the weed gains resistance.
> Good old evolution adapting to the very strong
> enhanced/artifical selective pressure.
> The physical methods such as sound, tillage, flooding, draw
> downs, competition, timing of planting can greatly reduce the
> amount of work, cost etc.
> Same deal for us.
> Our weeds are mainly algae, our crop are the plants.
> No one has tried the ultra sound in marine weeds, but many
> marine mammals use the ultrasound frequency, while few animals
> in FW systems do.
> I had considered using those small ultrasound fogging units and
> set up a frequency timer for aquarium applications.
> A company could make them for 100-200$ pretty easily.
> Regards, 
> Tom Barr
> www.BarrReport.com
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