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5. Biological Control of Leafy Spurge with the Use of Pathogens.  Tony Caesar

Pathogenic soilborne fungi have been isolated from insects (or plants which have been injured by insects) which are biological control agents of rangeland weeds. Rhizoctonia, Pythium and Fusarium spp. have been isolated from Aphthona nigriscutis or A. flava and leafy spurge. Similar results have been obtained in Europe on Euphorbia spp. Several bacteria are also associated with insect-injured leafy spurge. Plants of Centaurea maculosa and C. diffusa in Russian with injuries to the roots and crowns, caused by larvae of three different insects, are also infected by Fusarium, Pythiyum, Rhizoctonia and other species. The possible implications of these results for biological control will be discussed.

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