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Puccinia carduorumfrom Turkey was evaluated for biological control ofCarduus thoermeriunder controlled greenhouse and field conditions. We measured the susceptibility of 16 accessions ofC. thoermeri(the target weed), 10 accessions of related weedyCarduusspp., 22 native and 2 weedyCirsiumspecies, andCynara scolymus(artichoke). All collections (including 99.2% of the individuals) ofC. thoermeriwere...
Subanguina (Paranguina) picridis is the only plant pathogen, along with the fungus Puccinia acroptili, known to be effective as a biological control agent against Russian knapweed, Acroptilon repens (L.)DC. The nematode causes galls on stems and leaves of knapweed which considerably weaken and stunt the plants. A formulation technique for long-term storage of the nematode has been developed for nematodes...
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