Department of Applied Entomology, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.
Department of Pesticide Chemistry and Technology, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.
Environ Sci Pollut Res Int. 2018 Jun;25(16):15671-15679. doi: 10.1007/s11356-018-1780-1. Epub 2018 Mar 25.
The peach fruit fly (PFF), Bactrocera zonata, is a serious insect pest infesting fruits and vegetables. The insecticidal activity of three monoterpenes, namely, (R)-camphor, (R)-carvone, and (1R,2S,5R)-menthol, was evaluated on the second-instar larvae of B. zonata. In addition, the latent effects of monoterpenes on pupation, adult emergence, deformation, oviposition, adult longevity, and ovarian development were also examined. The three tested monoterpenes showed pronounced insecticidal activity against B. zonata larvae with (R)-carvone being the most potent toxicant. When the second-instar larvae of B. zonata were treated with monoterpenes at concentrations of 20, 50, and 70 mg/kg for 72 h, significant reduction in pupation and adult emergence was observed. The three monoterpenes caused complete suppression of adult emergence at 100 mg/kg. Moreover, monoterpenes induced complete inhibition of egg deposition at all tested concentrations. Some adult deformations were also noticed at 20, 50, and 70 mg/kg. However, (R)-carvone was more effective than (1R,2S,5R)-menthol and (R)-camphor on the examined biological parameters. On the other hand, histological examination of the ovaries of emerged females from larvae that fed on diet treated with (R)-carvone, (1R,2S,5R)-menthol, and (R)-camphor at 20 and 50 mg/L indicated that both concentrations caused retardation in the development of ovarioles. It is clear that all the egg chambers are empty; the germarium region is constricted at base due to the failure of oocyte formation. Many vacant spaces were present between ovarioles.
桃果实蝇（Bactrocera zonata）是一种严重的果蔬害虫。评估了三种单萜（R）-樟脑、（R）-香芹酮和（1R，2S，5R）-薄荷醇对 B. zonata 二龄幼虫的杀虫活性。此外，还研究了单萜对化蛹、成虫出现、变形、产卵、成虫寿命和卵巢发育的潜在影响。三种测试的单萜对 B. zonata 幼虫表现出明显的杀虫活性，其中（R）-香芹酮是最有效的毒物。当 B. zonata 二龄幼虫用单萜在 20、50 和 70mg/kg 浓度下处理 72 小时时，化蛹和成虫出现显著减少。三种单萜在 100mg/kg 时完全抑制成虫出现。此外，单萜在所有测试浓度下完全抑制产卵。在 20、50 和 70mg/kg 时也观察到一些成虫变形。然而，（R）-香芹酮在测试的生物学参数上比（1R，2S，5R）-薄荷醇和（R）-樟脑更有效。另一方面，在 20 和 50mg/L 时，用（R）-香芹酮、（1R，2S，5R）-薄荷醇和（R）-樟脑处理的饲料喂养的幼虫中出现的雌成虫的卵巢组织学检查表明，这两种浓度都会导致卵巢小管发育迟缓。很明显，所有的卵室都是空的；由于卵母细胞形成失败，生殖腺区域在基部收缩。在卵巢小管之间存在许多空的空间。
