Ever wonder why your peat moss didn't stop damping off?

You may find this article of interest:

Link: www.actahort.org/books/221/221_22.htm

Can this happen with cocoa fiber? That’s what I use in place of peat for seedlings.

Jadae, see:

Link: www.actahort.org/books/517/517_34.htm

Jadae, sorry, you wrote cocoa and my eyes read COCONUT.

Cocos is also called coir. I think this is what Jadae is talking about. Apparently good stuff, and a renewable resource. A search of the web will yield other links; I’ve put one below.

Link: www.ftld.ufl.edu/Hort/Environmental/Media_Nutrition/COIR%20potential.htm

My bad, I definately meant coconut fiber. I was taught that it was slightly alkine but that article said slightly acidic. The article did say that the mix similar to what I use (I use 10% coconut fiber)is equal to better than an equivelent peat mix. Unless I read it wrong.


Title: Suppression of Phytophthora and Pythium damping-off of tomato by coconut coir dust.

Authors: Candole, B. L.; Evans, M. R.

Authors affiliation: Dept. of Horticulture, University of Arkansas, Fayetteville, AR, 72701, USA, USA.

Published in: Phytopathology, volumn 93(6 Supplement), pages S13-S14, (2003).

Abstract: “Coconut coir dust, a waste product from coconut fiber processing, has been shown to be a good alternative to peat in growing media. Greenhouse experiments were conducted to determine if coconut coir dust can also suppress soilborne plant pathogens by using tomato damping-off caused by Phytophthora capsici, Phytophthora nicotianae, Pythium aphanidermatum, and Pythium ultimum as model pathosystems. Tomato seeds cv. ‘Bonnie Best’ were planted into noninfested and infested growing media contained in 5X5, 2.5-ml plastic plug trays. Growing media were infested with two-week-old cultures of the pathogens in V8 juice-peat medium at the rate of 1% (w/w). Stand counts were made when noninfested controls reached complete emergence. Populations of Phytophthora capsici, Phytophthora nicotianae, and Pythium aphanidermatum; and damping-off incidence were significantly reduced by 68-76% and 94-100% respectively in coconut coir dust compared to controls in peat. Results from Pythium ultimum were not conclusive. Autoclaving coconut coir dust had no effect on suppressiveness indicating that the nature of the suppressiveness is not biological.”

Wow, youre fast haha! Very interesting stuff. Thank you. I do have to say that only 1 seedling died of damp off last spring with coconut fiber but they were all rugosa hybrids. This year will be a wide spectrum of types so I can see how it compares.