【目的】 明确齐齐哈尔市玉米田双斑长跗萤叶甲 Monolepta hieroglyphica成虫发生规律，为该害虫的预测预报和综合防治提供科学依据。【方法】 2017-2019年，通过在齐齐哈尔市玉米田间罩网，定点观察双斑长跗萤叶甲成虫羽化动态、虫体大小、发生数量与温度及降雨量的关系。【结果】 成虫羽化出土始见期在7月上中旬，初期羽化出土的成虫虫体偏小；7月下旬-8月上旬为成虫羽化出土高峰期，虫体的长度与宽度明显增大，8月上中旬，羽化出土的成虫虫体达到最大值；8月中旬以后羽化出土成虫数量明显下降，成虫虫体的长度与宽度逐渐减小；到8月下旬-9月上旬只有少量的成虫羽化出土，成虫虫体的大小与初期羽化出土期的相近；9月中旬以后零星羽化出土的成虫虫体大小达到最小值；9月下旬以后未见有成虫羽化出土，10月上旬田间成虫消失。双斑长跗萤叶甲成虫羽化出土持续时间在61-74 d，平均1 m²玉米田羽化出土的成虫12.0-97.8头。温度对双斑长跗萤叶甲成虫羽化出土始见期、盛发期、持续时间影响较大，5-7月温度高有利于成虫羽化出土。降雨量对羽化出土的双斑长跗萤叶甲成虫总量影响较大，6-8月降雨量大羽化出土的成虫数量减少。【结论】 齐齐哈尔玉米田双斑长跗萤叶甲成虫在7月上中旬羽化出土，8月上中旬达到高峰，与当地玉米抽雄吐丝期相遇，8月中旬后成虫羽化数量明显减少，8月下至9月初仅有零星羽化出土，9月下旬无新羽化出土，10月上旬田间成虫消失。成虫虫体大小与羽化时期密切相关，以羽化盛期的虫体最大。温度和降水影响成虫的羽化时间和数量。

[Objectives]  To determine the timing of occurrence of adults of Monolepta hieroglyphica in cornfields in Qiqihar and provide a scientific basis for forecasting and developing an IPM strategy for this pest. [Methods]  The emergence dynamics and body size (length and width) of M. hieroglyphica adults were systemically measured in cornfields by covering fixed sites with nets in from 2017 to 2019. [Results]  The first adults were found in early to mid-July with the peak of emergence occurring from mid-July to early August, The number of emerged adults significantly decreased after mid-August, with few emerging from late-August to early September. No newly emerged adults were observed after mid-September and all had disappeared by early October. The adult post-emergence period was 61 d to 74 d, and the number of adults per square meter ranged from 12.0 to 97.8. Adults were smaller in terms of length and width at the beginning of emergence, were of maximum size during the peak of emergence, and then of a similar size to that observed during the initial period of emergence. Temperature had a significant influence on initial and peak emergence, and the duration of emergence. High temperatures during May-July were beneficial to adult emergence. More rainfall from June to August decreased the number of adults that emerged. [Conclusion]  The first adult M. hieroglyphica emerged in cornfields in Qiqihar in early to mid-July, and the majority in early to mid-August. The number of emerged adults deceased significantly after mid-August, with few emerging from late August to early September. No newly emerged adults were observed in late September. The length and width of emerged adults was related to the timing of emergence, being greatest during the peak of emergence. Temperature and rainfall affected the emergence time and the total number of adults that emerged.