![]() 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. Moran, Patrick J Wibawa, M Irene Smith, LincolnĪceria 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. Tolerance of the eriophyid mite Aceria salsolae to UV-A light and implications for biological control of Russian thistle.
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