Puccinia jaceae var. solstitialis
... that the rust fungus Puccinia jaceae var. solstitialis is the first plant pathogen approved by the United States Department of Agriculture as a biological control agent?
... that the <a href="./Rust_(fungus)" id="mwE00" rel="mw:WikiLink" title="Rust (fungus)">rust</a> fungus <b id="mwE04"><a href="./Puccinia_jaceae_var._solstitialis" id="mwE08" rel="mw:WikiLink" title="Puccinia jaceae var. solstitialis"><i id="mwE1A">Puccinia jaceae</i> var. <i id="mwE1E">solstitialis</i></a></b> is the first <a class="mw-redirect" href="./Plant_pathogen" id="mwE1I" rel="mw:WikiLink" title="Plant pathogen">plant pathogen</a> approved by the <a href="./United_States_Department_of_Agriculture" id="mwE1M" rel="mw:WikiLink" title="United States Department of Agriculture">United States Department of Agriculture</a> as a <a href="./Biological_pest_control" id="mwE1Q" rel="mw:WikiLink" title="Biological pest control">biological control agent</a>?