The control of Parlatoria ziziphi (Lucas, 1853) was studied in citrus orchards at Mechraa Belksiri in the Gharb area of Morocco. Three concentrations of spirotetramat T0 = 0 L/Ha as a control experiment, T1 = 0.625 L/Ha, T2 = 0.755 L/Ha, and T3 = 1 L/Ha, were applied on 4 ha of Valencia late orchard (each dose for 1 ha of Valencia late). The effect of spirotetramat was evaluated on the mortalities and survival rates of P. ziziphin during the stages of larvae (first instar and second instar) and females (F1, F2, and F3). Results showed that the spirotetramat was effective on larvae and females of P. ziziphi. Among the 11,229 females recorded, 93% were inhibited, while only 7% were intact after the treatment period. Finally, our study highlights that all concentrations tested were effective on the P. ziziphi population; besides, all three concentrations of this product tested were equally effective on larvae and females of P. ziziphi. Thus, during the spread period, spraying a low concentration of this product (0.625 L/Ha) will better control this pest and reduce the environmental impact.

中文翻译：

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不同浓度螺虫乙酯对柑橘园紫蛉鳞屑影响的评价

在摩洛哥 Gharb 地区 Mechraa Belksiri 的柑橘园中研究了Parlatoria ziziphi（卢卡斯，1853 年）的防治。三种浓度的螺虫乙酯 T0 = 0 L/Ha 作为对照实验，T1 = 0.625 L/Ha、T2 = 0.755 L/Ha 和 T3 = 1 L/Ha，应用于 4 公顷的瓦伦西亚晚果园（每个剂量用于1 公顷的瓦伦西亚晚）。在幼虫（一龄和二龄）和雌性（F1、F2 和 F3）阶段评估螺虫乙酯对P.ziziphin的死亡率和存活率的影响。结果表明螺虫乙酯对紫菜幼虫和雌虫均有效. 在记录的 11,229 名女性中，93% 被抑制，而在治疗期后只有 7% 完好无损。最后，我们的研究强调所有测试的浓度对P. ziziphi种群均有效；此外，该产品的所有三个浓度测试对P. ziziphi 的幼虫和雌性同样有效。因此，在传播期间，喷洒低浓度的该产品（0.625 L/Ha）将更好地控制这种害虫并减少对环境的影响。