Abstract
Pre-emergence damping-off tests indicate that Pythiumspp. from pond water can be divided into two categories: avirulent Pythium (P. diclinum, P. marsipium, P. middletonii, P. monospermum, P. pleroticum, P. undulatum)and weakly virulent Pythium (P. catenulatum, P. coloratum, P. dissotocum, P. papillatum, Pythium ‘Group F’, Pythium ‘group HS’, Pythium ‘group P’, Pythium‘group T’). Post-emergence damping-off tests indicate that the pythia tested can also be divided into three categories: avirulent Pythium (P. catenulatum, P. dissotocum, P. marsipium, P. monospermum, P, papillatum, P. pleroticum, P. undulatum, Pythium ‘group F’, Pythium ‘group T’),weakly virulent Pythium (P. coloratum, P. diclinum, P. middletonii, Pythium‘group P’ and moderately virulent Pythium (Pythium ‘group HS’).
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