Life-cycle of Puccinia abrupta var. partheniicola, a potential biological control agent of Parthenium hysterophorus.
This rust produced only 2 spore stages (uredia and telia) on the weed within its native habitat in NE Mexico. Conventional methods to induce teliospore germination were unsuccessful. A method is described in which teliospores were subjected to prolonged oxidation by H2O2 and NaHCl. H2O2 in particular stimulated teliospore germination and reduced contamination by hyperparasitic micro-organisms, after washing the telia in a conc. solution (30% w/v) for 30-60 min. By inoculating young plants under greenhouse conditions with basidiospores, pycnia and aecia were obtained. A brief description of these previously unrecorded spore stages is given. The rust is confirmed as being a macrocyclic, autoecious species.