Abstract
Abstract The number of sporangia on mycelial mats of Phytophthora cinnamomi Rands floated in non-sterile extracts of Auckland soils was increased more than twofold by first amending the soils with aqueous extracts of freshly collected cow's dung or urine 1 week previously. Autoc1aving the extracts or passing them through a 100 mμ millipore filter removed the enhancement factor which appears to be ineffectual unless sporangial initiation factors are already present, as in non-sterile soil extract. The enhancement factor from a dung extract which had been passed through a 0.45 μ filter remained effective in resuspended residue from a 100 μm filter. The factor may have been associated with some of the gut flora which remained in the residue. The enhancement factor is present in naturally amended farmyard soil. It reached comparable levels within 2 weeks in soils below a surface layer of added excreta in an ungrazed area of grassland and was maintained by a further addition of excreta at the end of the second...
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