Abstract
A plate-count method using a selective medium was devised for population studies of C. sativus in field soils. The medium, quarter-strength potato-sucrose agar, contains antibiotics (streptomycin and neomycin) and fungicides (benomyl, captan and dichloran). It restricts the development of undesirable fast-growing fungi, bacteria and actinomycetes but permits growth of C. sativus. Its efficiency in determining C. sativus populations in field soils was demonstrated using 1:100 soil dilutions in 0.1% water agar.

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