Abstract:  Mythimna loreyi is a relative species of Mythimna seperata. The two pest species are similar in morphology and have basically the same damage characteristics, but there may be some differences in the occurrence and damage rules in different regions. In recent years, M. loreyi has become a common agricultural pest with frequent outbreaks in many countries and regions. In order to deeply study the outbreak law and to comprehensively prevent and control this pest, we summarized its research status based on the analysis of domestic and foreign research data in this article. At present, M. loreyi has been distributed in nearly 80 countries and regions in Asia, Europe, Africa, Oceania and North America. The larvae of this pest feed on a variety of gramineous crops and weeds, such as corn, rice and wheat. Before the 3rd instar, the larvae eat less, the 5th-6th instar larvae eat more, and enter the gluttony stage. The larvae of M. loreyi are aggregative, omnivorous and gluttonous, and the adults are migratory. The damage caused by this pest is covert, sporadic and fulminant. There are differences in the law of the occurrence and damage of M. loreyi due to different regions, years and seasons. Climatic conditions, food and natural enemies are the main factors that affect its damage. At the same time, it is pointed out that climatic factors, human activities and the biological characteristics of M. loreyi are the important factors that have led to its occurrence expansion and damage aggravation in recent years. Sex attractants, natural enemies and biological pesticides are the main research directions in the biological control of this pest in recent years. Based on the occurrence and research status of M. loreyi in China, the following three aspects are suggested to be carried out in the future work: (1) By learning from the prevention and control strategies and experience of M. seperata, strengthening the prediction and forecast of M. loreyi from two aspects of air forecast and ground forecast; (2) carrying out comprehensive prevention and control work from agricultural control, physical control, biological control and chemical control; and (3) applying modern technologies and methods such as biotechnology and modern agricultural information technology to study the law of outbreak and disaster, integrated prevention and control of M. loreyi, and to establish the comprehensive prevention and control technology systems.

Key words: Mythimna loreyi, Mythimna seperata; occurrence, integrated control, natural enemies