临海柑橘园橘小实蝇种群数量消长规律

【背景】近年来，随着种植结构的改变以及南方携虫水果的频繁调运，橘小实蝇逐渐向北扩散危害，对水果生产造成严重威胁。【方法】2008～2010年应用性诱剂的监测方法对柑橘园橘小实蝇种群数量进行了定点、系统的跟踪监测；并结合气象资料和田间调查情况，通过对当旬成虫数量与当旬及其前延逐句气象要素的筛选来建模，进而确定影响橘小实蝇种群数量的主要气象因子。【结果】临海柑橘园橘小实蝇种群数量时序变化呈单峰型曲线，其性诱成虫初见期在6月下旬至8月初，高峰期在9月上旬至11月上旬，11月中旬后成虫数量逐渐下降，到12月下旬未诱集到成虫。气象因子筛选和建模结果表明，柑橘园橘小实蝇成虫种群数量年度变动以旬平均温度为决定要素，季节性变化以旬降雨量为决定要素。【结论与意义】临海柑橘园橘小实蝇种群数量随温度和土壤湿度的增大而增长。本研究对提高橘小实蝇监测预警水平、有效控制橘小实蝇危害具有重要意义。

Population dynamics of the oriental fruit fly （Bactrocera dorsalis） in citrus orchard at Linhai, Zhejiang Province, China

Background] The oriental fruit fly （Bactrocera dorsalis Hendel） has been gradually spreading northwards in recent years due to the change of plantation structure and transportation of infested fruit from south to north. It became a great threaten to fruit industry in north. Method] Population dynamics of the oriental fruit fly in citrus orchard at Linhai, Zhejiang Province, was system- atically monitored by sex pheromone traps during 2008 ~ 2010. Combining with meteorological data and field surveys, models were built, using the numbers of adults and meteorological data at 10-days intervals. Result] The oriental fruit fly at Linhai had a single- peak population curve. Adults started to appear in late June to early August and the population peaked between early September and early November. After this, the population decreased until late December when adults were not captured any more. The model anal- ysis showed that the 10-days average temperature determined the annual peak, while rainfall was an important factor in seasonal population dynamics through influencing soil moisture. Both higher temperatures and higher soil moisture were positive factors. Conclusion and significance ] The study will contribute to improving forecast and allowing for a more effective control of this invasive species.