Pythium root rot and stunting of Peperomia obtusifolia var. variegata.
The relationship between a cutting rot, root rot and stunting of the plant by a P. sp. was established for the first time. Root rot and stunting occurred when rooted cuttings were planted in soil artificially infested with P. splendens. Plants grown for 6 months in this soil were c. half the size of those grown in non-infested soil. There were no other above-ground symptoms. In contrast, inoculation of the crown resulted in a rapid rotting and total collapse of rooted cuttings. The tests failed to establish a definite connexion between root rot caused by P. splendens and grey-leaf, a disorder of unknown aetiology.