Rhodes Elena M, Liburd Oscar E
Department of Entomology and Nematology, University of Florida, Gainesville, FL 32611, USA.
J Econ Entomol. 2006 Aug;99(4):1291-8. doi: 10.1603/0022-0493-99.4.1291.
Greenhouse and field experiments were conducted from 2003 to 2005 to determine the effectiveness of two predatory mite species, Phytoseiulus persimilis Athias-Henriot and Neoseiulus californicus (McGregor), and a reduced-risk miticide, Acramite 50 WP (bifenazate), for control of twospotted spider mite, Tetranychus urticae Koch, in strawberries (Fragaria x ananassa Duchesne). In greenhouse tests, three treatments consisting of releases of P. persimilis, N. californicus, and an untreated control were evaluated. Both species of predatory mites significantly reduced twospotted spider mite numbers below those found in the control during the first 3 wk of evaluation. However, during week 4, twospotted spider mite numbers on the plants treated with P. persimilis increased and did not differ significantly from the control. Field studies used releases of P. persimilis and N. californicus, applications of Acramite, and untreated control plots. Both N. californicus and P. persimilis significantly reduced populations of twospotted spider mite below numbers recorded in the control plots. During the 2003-2004 field season P. persimilis took longer than N. californicus to bring the twospotted spider mite population under control (< 10 mites per leaflet). Acramite was effective in reducing twospotted spider mite populations below 10 mites per leaflet during the 2003-2004 field season but not during the 2004-2005 field season, possibly because of a late application. These findings indicate that N. californicus releases and properly timed Acramite applications are promising options for twospotted spider mite control in strawberries for growers in north Florida and other areas of the southeast.
2003年至2005年开展了温室和田间试验，以确定两种捕食螨，即智利小植绥螨（Phytoseiulus persimilis Athias-Henriot）和加州新小绥螨（Neoseiulus californicus (McGregor)），以及一种低风险杀螨剂阿克螨50WP（联苯肼酯）对草莓（Fragaria x ananassa Duchesne）上二斑叶螨（Tetranychus urticae Koch）的防治效果。在温室试验中，评估了三种处理，包括释放智利小植绥螨、加州新小绥螨以及一个未处理对照。在评估的前3周内，两种捕食螨均显著降低了二斑叶螨数量，使其低于对照中的数量。然而，在第4周时，用智利小植绥螨处理的植株上二斑叶螨数量增加，与对照无显著差异。田间研究采用了释放智利小植绥螨和加州新小绥螨、施用阿克螨以及未处理对照地块。加州新小绥螨和智利小植绥螨均显著降低了二斑叶螨种群数量，使其低于对照地块记录的数量。在2003 - 2004年田间季，智利小植绥螨比加州新小绥螨花费更长时间才将二斑叶螨种群数量控制在较低水平（每小叶<10只螨）。在2003 - 2004年田间季，阿克螨能有效将二斑叶螨种群数量降低至每小叶10只螨以下，但在2004 - 2005年田间季则无效，可能是因为施用时间较晚。这些结果表明，对于佛罗里达州北部和东南部其他地区的种植者而言，释放加州新小绥螨以及适时施用阿克螨是防治草莓二斑叶螨的有前景的选择。
