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Re: Simazine


>From: "eng chuah" <ur008598 at mail01_bne.aone.net.au>
>To: Aquatic-Plants at actwin_com
>Date: Fri, 27 Feb 1998 07:37:38 +0000
>I have been using a commercial preparation of Simazine for several years with 
>variable results. Prior to November 97 it has been a sure {albeit slow} control 
>for filamentous type algae. It appears to inhibit photosynthesis and denatures 
>Observations on Algae:
>1. Reaction time {for f. algae} is about 2 - 3 wks before observable effects.
>2. No observable effect on motile {green-water} algae.
>3. Existing f.algae hang on to leaves. Best to prune leaves off.
>Observations on Higher Order Plants :
>1. Fatal on Duckweeds {Lemna Minor, Spirodela}, Cornuta, Bolbitis and 
>Microsorium Sp., Ottelia, Maidenia 
>2. Inhibits  Echn. Sp., Apgn. Sp., Myro. Sp., Rotalas, Pogostemmons
>In November 97, one such application resulted in the complete destruction of a 
>pond. It was synonomous to effects from an over dose. To- date the trigger has 
>not been determined.
>I initially suspected acid conditions {pH 6.2 to 6.8} from CO2 injection but 
>this was discounted after further trials. The manufacturer does not indicate 
>the water conditions for the product, I can only assume that ponds tend to be 
>alkaline under algae blooms and the product is configured for this.
>The next trial is to apply the Simazine prior to darkness {after the 
>photosynthesis period}.
>Somehow, there is a trigger which multiplies the reaction many times over. I 
>strongly suggest that anyone using this product has aeration on hand {just in 
>case !} The DO bottomed out with total loss of Shrimps and Snails before I 
>could arrest the reaction.
>Eng Chuah  ANGFA {Qld} Australia