The migratory locust, Locusta migratoria, is one of the famous insect pests in the world. Although the species revealsseveral morphological variations, it is largely divided into two lineages, Southern (Africa, Southern Europe, Southern Asia,and Australian) and Northern (East Asia, Eurasian continent). In 2014, a large number of L. migratoria nymphs withred-brown color were suddenly occurred in the southern region (Haenam-gun, Jeollanam-do) of Korea. In this study, mitochondrialCOI sequences were analyzed to recognize the genetic identity of L. migratoria with nymph or adult samples collectedfrom 15 localities in Korea. The analysis results reveal that most of all samples are belonging to the Nothern lineage,and the Southern lineage was discovered only in Iksan and Chunju of Korea.

To investigate unknown molecualr and cellular mechanisms underlying polyphenisms in the migratory locusts, we performed whole transcriptome analysis from 12 different groups. Significantly differentially expressed coding and long non-coding (LNC) RNAs were present according to habitats, phases, and genders. Those differentially expressed coding and LNC RNAs were confirmed by quantitative-realtime-reverse transcriptase PCR. Those identified coding and LNC RNAs could be a target for developing environmental friendly management tools in the near future.

Polyphenism is one of the most intriguing phenomenon observed from various insect species. Polyphenism is changing morphological, behavioral, and physiological phenotypes without changing genome informations. Therefore, polyphenism is thought to be controlled by epigenetic methods. Epigenetic controls are including DNA methylation, histone acetylation, small RNAs, long non-coding RNAs, and protein phosphorylation. To investigate the mechanism involved in polyphenism, various genomic researches have been completed. However, metabolite changes in different phases have not been reported yet. Thus, we studied the metabolite changes and found the changed metabolites. These studies will make an important contribution to reveal the difference between gregrious and solitary phases and reveal eco - friendly control techniques.

The migratory locust, Locusta migratoria, is one of the famous insect pests in the world. Although the species reveals several morphological variations, it is largely divided into two lineages, Southern (Africa, Southern Europe, Southern Asia, and Australian) and Northern (East Asia, Eurasian continent). In 2014, a large number of L. migratoria nymphs with red-brown color were suddenly occurred in the southern region (Haenam-gun, Jeollanam-do), Korea. In this study, mitochondrial COI sequences were analyzed to recognize the genetic identity of L. migratoria with nymph or adult samples collected from 9 localities in Korea. The analysis results reveal that all individuals are belonging to the Northern lineage.