Natural plant extracts to combat Saprolegnia fungus.

Sounds promising!

 

Aquaculture
Volume 359, Number 5 (August 2012)
The efficacy of selected plant extracts and bioflavonoids in controlling infections of Saprolegnia australis(Saprolegniales; Oomycetes)
Authors: S. Caruana, G.H. Yoon, M.A. Freeman, J.A. Mackie, A.P. Shinn
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Source: Aquaculture, Volume 359, Number 5 (August 2012)
Page Numbers: 146 – 154
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Abstract: Saprolegniainfections can account for the significant loss of salmonid eggs and adults in breeding condition and although there are a number of chemical agents available to control infections in hatcheries, treatment is difficult and there are reservations regarding their efficacy, prompting a search for suitable replacements. Here, the efficacy of 24 crude plant extracts and 3 bioflavonoids on the growth of Saprolegnia australis were assessed using an in vitro agar diffusion method against a set of synthetic chemotherapeutants commonly used within the aquaculture industry. The 12 best extracts inhibiting growth at =100ppm, were then added to cultures of S. australisin a GP broth and the daily growth was monitored spectrophotometrically over a 7-day period. All 12 plant extracts reduced growth, however, only Atractylodes macrocephala, Zingiber officinale seed, Chrysanthemum and Yucca were as effective as 10ppm malachite green in slowing growth. A subsequent trial, where doses of the plant extract were given at 72 and 120h post-inoculation, found that Rumex obtusifolius, Sophora flavescens, Echinaceaand Z. officinale were the most effective compounds impacting growth. The study demonstrates that certain plant extracts impact on the growth dynamics of S. australisbut further research is required to assess their performance in vivo.
Citation: S. Caruana, G.H. Yoon, M.A. Freeman, J.A. Mackie, A.P. Shinn . The efficacy of selected plant extracts and bioflavonoids in controlling infections of Saprolegnia australis(Saprolegniales; Oomycetes). Aquaculture, Volume 359, Number 5 (August 2012), pp. 146-154, <http://ejournals.ebsco.com/direct.asp?ArticleID=4010BD15760B69FA953A&gt;
URL: http://ejournals.ebsco.com/direct.asp?ArticleID=4010BD15760B69FA953A

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