The two nontarget plants attained greater volume under the control light regime than UV-A, but Russian thistle was unaffected. ![]() Main stems on nontarget plants grew 2- to 6-fold faster than did Russian thistle under either light treatment. calceoliformis, whereas it increased populations 7-fold on B. UV-A exposure did not affect mite populations on Russian thistle or S. Russian thistle supported 3- to 55-fold larger mite populations than nontarget plants regardless of UV-A treatment. salsolae under lamps that emitted UV-A, along with broad-spectrum lighting, and the size of mite populations and plant growth was compared to infested plants exposed only to broad-spectrum light. salsolae differently on the target and nontarget plant species, decreasing the mite's realized host range. We hypothesized that UV-A light, which can affect behavior of tetranychid mites, would affect populations of the eriophyid A. ![]() ![]() ![]() However, in field tests in the native range, mite populations released on these 'nontarget' plants remained low. Prior laboratory host range testing under artificial lighting indicated reproduction on non-native Bassia hyssopifolia and on a native plant, Suaeda calceoliformis. Aceria salsolae (Acari: Eriophyidae) is being evaluated as a candidate biological control agent of Russian thistle ( Salsola tragus, Chenopodiaceae), a major invasive weed of rangelands and dryland crops in the western USA.
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