Subdirección de Desarrollo de Métodos, Programa Moscafrut SAGARPA-IICA, Av. Central Poniente 14, Col. Centro, CP 30700, Tapachula, Chiapas, México.
J Econ Entomol. 2011 Dec;104(6):1885-91. doi: 10.1603/ec10365.
The objective of this study was to determine the relationship between residual time of GF-120 (spinosad) treatment and mortality in three species of Anastrepha Schiner. Concentrations of 96, 72, 48, and 24 ppm were aged on mango leaves under field conditions for 0, 3, 7, 10, 14, 17, and 21 d after application. We found that Anastrepha ludens, A. obliqua, and A. serpentina were highly sensitive to spinosad. The effects of spinosad were not reduced over the 4 d after the initial application, even at a concentration of 24 ppm. Mortality at 14 d after the application of 72 and 96 ppm of spinosad was similar in each of the three fruit fly species. In addition, we found that 24 ppm of spinosad was consumed the most by each species even though no direct relationship between the rate of consumption per female and the dose of the product was observed, in this test, higher consumption of active ingredient was observed at a concentration of 72 ppm, for A. ludens, 48 ppm for A. obliqua, and 96 ppm for A. serpentina. Our results suggest that a spinosad concentration of 72 ppm may effectively control these pests for at least 10 d under field conditions.
本研究的目的是确定 GF-120（多杀菌素）处理残留时间与三种番石榴实蝇属（Anastrepha Schiner）死亡率之间的关系。在田间条件下，将 96、72、48 和 24 ppm 的浓度施用于芒果叶上，处理后 0、3、7、10、14、17 和 21 天进行老化。我们发现，A. ludens、A. obliqua 和 A. serpentina 对多杀菌素高度敏感。即使在 24 ppm 的浓度下，最初施用后 4 天内多杀菌素的作用也不会降低。在施用 72 和 96 ppm 多杀菌素后 14 天，三种实蝇的死亡率相似。此外，我们发现，即使在本试验中没有观察到每个雌性消耗的速度与产品剂量之间的直接关系，但每个物种都消耗了最多的 24 ppm 的多杀菌素，甚至观察到在 72 ppm 的浓度下，活性成分的消耗更高，对于 A. ludens，48 ppm 对于 A. obliqua，96 ppm 对于 A. serpentina。我们的结果表明，在田间条件下，72 ppm 的多杀菌素浓度可能有效控制这些害虫至少 10 天。
