Filtration to Eliminate <i>Phytophthora</i> spp. from Recirculating Water Systems in Commercial Nurseries

Fig. 8. Effect of average daily air temperature on filtration success from 2003-2006. [Only data from corresponding samples (*) with positive Phytophthora detection in the retention reservoir and no detection in the filtrate are shown (SSF n = 21, LGF n = 5). SSF = slow sand filter, LFG = lava grain filter.]
(A) Effect of average daily air temperature on filtration success for the SSF systems at SSF 1, SSF 2, and SSF 3.



Image from Plant Health Progress article:
Filtration to Eliminate Phytophthora spp. from Recirculating Water Systems in Commercial Nurseries