Insect-Transmitted Urediniospores of the Rust Puccinia punctiformis Cause Systemic Infections in Established Cirsium arvense Plants

Establishing systemic rust infections in Cirsium arvense in the field

An existing method to induce systemic rust infections in creeping thistles (Cirsium arvense) using an insect vector, the weevil Ceratapion onopordi, was successfully applied in the field. Urediniospores of Puccinia punctiformis were experimentally transmitted to naturally grown thistles, to our knowledge for the first time resulting in systemically infected shoots in an established thistle popu...

Enhancing incidence of Puccinia punctiformis, through mowing, to improve management of Canada thistle (Cirsium arvense)

Biological control of Canada thistle using Puccinia punctiformis has been largely unsuccessful in part due to a low incidence of systemically infected shoots and heterogeneous distribution of teliospores in the soil. The present study investigated the feasibility of strategic mowing to improve incidence of systemically infected shoots, and enhance intraand/or inter-season disease development in...

Chemical Studies on Plants of Cirsium Arvense Species

Fungal Phytotoxins for Control of Cirsium arvense and Sonchus arvensis

Perennial weeds, including Cirsium arvense and Sonchus arvensis, are a common problem in crop fields, especially in agricultural systems with reduced herbicide usage. Herbicides recommended for control of these perennials generally are restricted to only a few active ingredients that tend to have low selectivity, especially on dicot crops. Microbial phytotoxins or their synthetic analogues may ...

Puccinia hemerocallidis, Cause of Daylily Rust, a Newly Introduced Disease in the Americas

Daylilies (Hemerocallis spp., Liliaceae) are one of the most important cultivated perennial plants in the United States. Daylily rust, a serious disease caused by Puccinia hemerocallidis Thüm., was observed in Georgia in August 2000 (14) and was found in at least 20 other states and in Costa Rica in 2001. It was originally described from Russia, reported throughout the Japanese archipelago, and...