Disinfection of recirculation water from closed cultivation systems with iodine
1994
Runia, W.T. (Glasshouse Crops Research Station, Naaldwijk (Netherlands))
The development from growing in border soil to soilless cultures has not resulted in the disappearance of soil-borne diseases. Most root-infecting pathogens also occur in these new cultivation systems. Some pathogens such as Pythium, Phytophthora, cucumber green mottle mosaic virus and tomato mosaic virus are easily transmitted in recirculation water as is Olpidium, the vector of several viruses. To exclude any risk of dispersal of plant pathogens the water has to be disinfected before re-use. Currently water disinfection by heat treatment, ozonisation or ultra-violet radiation is applied on over 500 nurseries in the Netherlands. These methods are effective against fungi, bacteria and viruses. Other disinfection methods are being tested. The possibilities of iodination are reported in this paper. The efficacy of iodine was tested against Fusarium oxysporum f.sp. lycopersici and tomato mosaic virus. Conidia of Fusarium were completely eliminated by a concentration of 0.7 ppm iodine. However iodination was not effective against tomato mosaic virus at concentrations below 15 ppm.
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