Huang Jun, Zhang Juan, Li Yan, Li Jun, Shi Xiao-Hua
Flower Research and Development Centre, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang Province, China.
The Key Laboratory of Chemistry for Natural Products of the Guizhou Province, Chinese Academy of Sciences, Guizhou, Guiyang Province, China.
PeerJ. 2016 Sep 21;4:e2480. doi: 10.7717/peerj.2480. eCollection 2016.
The screening of suitable insecticides is a key factor in successfully applying trunk injection technology to ornamental plants. In this study, six chemical pesticides were selected and injected into the trunks of Osmanthus fragrans to control the nettle caterpillar, Latoia lepida (Lepidoptera: Limacodidae), using a no-pressure injection system. The absorption rate of the insecticides, the leaf loss due to insect damage, and the mortality and frass amount of L. lepida larvae were evaluated after 77 and 429 days. The results showed that 4% imidacloprid + carbosulfan and 21% abamectin + imidacloprid + omethoate had the fastest conductivity and were completely absorbed into the trunkswithin14 days; however, the efficiencies of these insecticides in controlling L. lepidawere extremely low. Additionally, the treatment 10% emamectin benzoate + clothianidin and 2.5% emamectin benzoate was almost completely absorbed within 30 days and exhibited a longer duration of insecticide efficiency (>80% mortality) in the upper and lower leaves of the canopy. Treatment with these insecticides also resulted in significantly lower leaf loss and frass amounts. We conclude that emamectin benzoate and emamectin benzoate + clothianidin have a rapid uptake into O. fragrans, and are effective as insecticides over long durations. Hence, they may be a suitable control option for L. lepida in O. fragrans plants.
筛选合适的杀虫剂是将树干注射技术成功应用于观赏植物的关键因素。在本研究中，选择了六种化学农药，使用无压力注射系统注入桂花树干，以防治刺蛾（Latoia lepida，鳞翅目：刺蛾科）。在77天和429天后评估了杀虫剂的吸收率、因虫害导致的叶片损失以及刺蛾幼虫的死亡率和粪便量。结果表明，4%吡虫啉+丁硫克百威和21%阿维菌素+吡虫啉+氧化乐果的传导速度最快，在14天内完全被树干吸收；然而，这些杀虫剂防治刺蛾的效果极低。此外，10%甲氨基阿维菌素苯甲酸盐+噻虫胺和2.5%甲氨基阿维菌素苯甲酸盐处理在30天内几乎完全被吸收，并且在树冠上部和下部叶片中表现出较长的杀虫剂有效期（死亡率>80%）。用这些杀虫剂处理还导致叶片损失和粪便量显著降低。我们得出结论，甲氨基阿维菌素苯甲酸盐和甲氨基阿维菌素苯甲酸盐+噻虫胺能快速被桂花吸收，并且作为杀虫剂在长时间内有效。因此，它们可能是桂花植株中防治刺蛾的合适选择。
